Panasonic air error codes

Should there be an error in Panasonic air conditioners, they are deactivated and a light emitting diode starts to blink on the panel. If there is a multi-split system, one needs to read off error codes separately for each inner block. One can decipher Panasonic air error codes with the help of the table provided below. Without ignoring a malfunction message, you do not exacerbate a problem of repairs, which means repairs will not be complex and costly.

Panasonic CS-XE9SKUA air error codes

Diagnosis displayAbnormality/ Protection controlAbnormality JudgmentProtection OperationProblemCheck location
H00No memory of failureNormal operation
H11Indoor/outdoor abnormal communicationAfter operation for 1 minuteIndoor fan only operation can start by entering into force cooling operationIndoor/outdoor communication not establish• Indoor/outdoor wire terminal
• Indoor/outdoor PCB
• Indoor/outdoor connection wire
H12Indoor unit capacity unmatched90s after power supplyTotal indoor capability more than maximum limit or less than minimum limit, or number of indoor unit less than two• Indoor/outdoor connection wire
• Indoor/outdoor PCB
• Specification and combination table in catalogue
H14Indoor intake air temperature sensor abnormalityContinuous for 5sIndoor intake air temperature sensor open or short circuit• Indoor intake air temperature sensor lead wire and connector
H15Compressor temperature sensor abnormalityContinuous for 5sCompressor temperature sensor open or short circuit• Compressor temperature sensor lead wire and connector
H16Outdoor current transformer (CT) abnormalityCurrent transformer faulty or compressor faulty• Outdoor PCB faulty or compressor faulty
H19Indoor fan motor mechanism lockContinuous happen for 7 timesIndoor fan motor lock or feedback abnormal• Fan motor lead wire and connector
• Fan motor lock or block
H23Indoor heat exchanger temperature sensor abnormalityContinuous for 5sIndoor heat exchanger temperature sensor open or short circuit• Indoor heat exchanger temperature sensor lead wire and connector
H24Indoor heat exchanger temperature sensor 2 abnormalityContinuous for 5sIndoor heat exchanger temperature sensor 2 open or short circuit• Indoor heat exchanger temperature sensor 2 lead wire and connector
H27Outdoor air temperature sensor abnormalityContinuous for 5sOutdoor air temperature sensor open or short circuit• Outdoor air temperature sensor lead wire and connector
H28Outdoor heat exchanger temperature sensor 1 abnormalityContinuous for 5sOutdoor heat exchanger temperature sensor 1 open or short circuit• Outdoor heat exchanger temperature sensor 1 lead wire and connector
H30Outdoor discharge pipe temperature sensor abnormalityContinuous for 5sOutdoor discharge pipe temperature sensor open or short circuit• Outdoor discharge pipe temperature sensor lead wire and connector
H32Outdoor heat exchanger temperature sensor 2 abnormalityContinuous for 5sOutdoor heat exchanger temperature sensor 2 open or short circuit• Outdoor heat exchanger temperature sensor 2 lead wire and connector
H33Indoor! Outdoor Misconnection abnormalityIndoor and outdoor rated voltage different• Indoor and outdoor units check
H36Outdoor gas pipe temperature sensor abnormalityContinuous for 5sHeating protection operation onlyOutdoor gas pipe temperature sensor open or short circuit• Outdoor gas pipe temperature sensor lead wire and connector
H37Outdoor liquid pipe temperature sensor abnormalityContinuous for 5sCooling protection operation onlyOutdoor liquid pipe temperature sensor open or short circuit• Outdoor liquid pipe temperature sensor lead wire and connector
H38Indoor/Outdoor mismatch (brand code)Brand code not match• Check indoor unit and outdoor unit
H39Abnormal indoor operating unit or standby units3 times happen within 40 minutesWrong wiring and connecting pipe, expansion valve abnormality, indoor heat exchanger sensor open circuit• Check indoor/outdoor connection wire and connection pipe
• Indoor heat exchanger sensor lead wire and connector
• Expansion valve and lead wire and connector
H59ECONAV1 sensor abnormalityContinuous for 25sECONAVI sensor open or short circuit• ECONAVI sensor (defective or disconnected)
• ECONAVI PCB
H64Outdoor high pressure sensor abnormalityContinuous for 1 minuteHigh pressure sensor open circuit during compressor stop• High pressure sensor
• Lead wire and connector
H97Outdoor fan motor mechanism lock2 times happen within 30 minutesOutdoor fan motor lock or feedback abnormal• Outdoor fan motor lead wire and connector
• Fan motor lock or block
H98Indoor high pressure protectionIndoor high pressure protection (Heating)• Check indoor heat exchanger
• Air filter dirty
• Air circulation short circuit
H99Indoor operating unit freeze protectionIndoor freeze protection (Cooling)• Check indoor heat exchanger
• Air filter dirty
• Air circulation short circuit
F114-way valve Switching abnormality4 times happen within 30 minutes4-way valve switching abnormal• 4-way valve
• Lead wire and connector
F17Indoor standby units freezing abnormality3 times happen within 40 minutesWrong wiring and connecting pipe, expansion valve leakage, indoor heat exchanger sensor open circuit• Check indoor/outdoor connection wire and pipe
• Indoor heat exchanger sensor lead wire and connector
• Expansion valve lead wire and connector
F90Power factor correction (PFC) circuit protection4 times happen within 10 minutesPower factor correction circuit abnormal• Outdoor PCB faulty
F91Refrigeration cycle abnormality2 times happen within 20 minutesRefrigeration cycle abnormal• Insufficient refrigerant or valve close
F93Compressor abnormal revolution4 times happen within 20 minutesCompressor abnormal revolution• Power transistor module faulty or compressor lock
F94Compressor discharge overshoot protection4 times happen within 30 minutesCompressor discharge pressure overshoot• Check refrigeration system
F95Outdoor cooling high pressure protection4 times happen within 20 minutesCooling high pressure protection• Check refrigeration system
• Outdoor air circuit
F96Power transistor module overheating protection4 times happen within 30 minutesPower transistor module overheat• PCB faulty
• Outdoor air circuit (fan motor)
F97Compressor Overheating protection3 times happen within 30 minutesCompressor overheat• Insufficient refrigerant
F98Total running current protection3 times happen within 20 minutesTotal current protection• Check refrigeration system
• Power source or compressor lock
F99Outdoor direct current (DC) peak detectionContinuous happen for 7 timesPower transistor module current protection• Power transistor module faulty or compressor lock

Panasonic S-22KA1E5 air error codes

Outdoor Unit Error CodeAbnormality ControlAreas to verify
F27-01Indoor / outdoor unit communication line disconnection errorIndoor / outdoor unit communication line, lead wire terminal.
F30-01Total quantity / capacity of connected indoor unit errorTotal quantity / capacity of connected indoor unit is insufficient or over.
F30-02Noise filter circuit (capacitor) error.Outdoor unit main PCB.
F31-01Low pressure protectionRefrigerant cycle, 2 or 3-way valve close, insufficient refrigerant.
F31-02High pressure protectionRefrigerant cycle, 2 or 3-way valve close, overcharged refrigerant.
F31-064-way valve error4-way valve, outdoor unit noise filter PCB, connector CN-HOT.
F31-08Indoor unit freezing errorAbnormal indoor unit expansion valve.
F32-04IPM temperature protectionOutdoor unit main PCB. power supply.
F32-05Total current protectionCompressor locked, refrigerant cyde.
F32-06Compressor discharge temperature protectionInsufficient refrigerant.
F32-08PFC protectionOutdoor unit main PCB.
F32-09DC peak current errorIPM abnormal, compressor locked, compressor lead wire connection, outdoor unit main PCB.
F32-10Compressor rotation errorIPM abnormal, compressor locked, compressor lead wire connection, outdoor unit main PCB.
F35-02Outdoor DC fan motor errorOutdoor DC fan motor, outdoor unit main PCB, connector CN-FM1, CN-FM2.
F40-01Outdoor temperature sensor errorOutdoor temperature sensor lead wire, outdoor unit main PCB, connector CN-TH1.
F40-11Compressor suction temperature sensor errorCompressor suction temperature lead wire, outdoor unit main PCB, connector CN-TH2, 3- way valve close.
F40-21Outdoor heat exchanger temperature sensor errorOutdoor heat exchanger temperature sensor lead wire, outdoor unit main PCB, connector CN-TH1.
F40-31DEF temperature sensor errorDEF temperature sensor lead wire, outdoor unit main PCB, connector CN-TH2.
F40-51Compressor discharge temperature sensor errorCompressor discharge temperature sensor lead wire, outdoor unit main PCB, connector CN-DIS.
F41-02High pressure switch disconnection errorHigh pressure switch lead wire, outdoor unit main PCB. connector CN-PSW1.
F41-12Low pressure switch disconnection errorLow pressure switch lead wire, outdoor unit main PCB. connector CN-PSW2.
F42-11Outdoor CT disconnection errorOutdoor unit main PCB.
F44-01IPM temperature sensor errorOutdoor unit main PCB.
F45-01Outdoor address double registration errorOutdoor unit address.
F15-01Drain level errorDrain pump, float switch, drain pipe, indoor unit main PCB. connector CN-DRMTR. CN-TH2.
F17-02Indoor DC fan motor errorIndoor DC fan motor, connector CN-FM.
F20-01Indoor liquid pipe temperature sensor errorIndoor liquid pipe temperature sensor lead wire, indoor unit main PCB. connector CN-TH2.
F20-02Remote control thersistor errorRemote control thermistor.
F21-01Indoor heat exchanger temperature sensor errorIndoor heat exchanger temperature sensor lead wire, indoor unit main PCB. connector CN-TH1.
F22-01Indoor gas pipe temperature sensor errorIndoor gas pipe temperature sensor lead wire, indoor unit main PCB. connector CN-TH1.
F25-01Indoor address double registration errorIndoor unit address.
F26-01Remote control communication line disconnection errorRemote control lead wire, terminal, indoor unit main PCB connector CN-REM.
F27-01Indoor / outdoor unit communication line disconnection errorIndoor / outdoor unit communication lead wire, connection terminal, indoor unit main PCB connector CN-UN, outdoor unit address.
F31-08Indoor unit freezing error.Abnormal indoor unit expansion valve, indoor unit heat exchanger sensor.

Panasonic S-45PU1E5 air error codes

Alarm/ CodeAlarm Meaning
E01Remote Controller Reception Error
E02Remote Controller Transmission Error
E03Error in Indoor Unit Receiving Signal from Remote Controller (central)
E04Error in Indoor Unit Receiving Signal from the Outdoor unit
E05Error in Indoor Unit Transmitting Signal to the Outdoor Unit
E06Outdoor Unit Failed to Receive Serial Communication Signals from Indoor Unit
E07Outdoor Unit Sending Failure to Indoor Unit
E08Duplicate Indoor Unit Address Settings Error
E09More Than One Remote Controller Set to Main Error
E12Automatic Address Setting Start is Prohibited while Auto-address Setting in Progress.
E13Error in Indoor Unit Transmitting Signal to Remote Controller
E14Main Unit duplication in Simultaneous-operation Multi Control (detected outdoor unit)
E15Automatic Address Alarm (capacity too low)
E16Automatic Address Alarm (capacity too high)
E18Faulty Communication in Group Control Wiring
E20No Indoor Units Connected
F04Compressor Discharge Temperature Sensor (TD) Trouble
F06Inlet Temperature Sensor (C1) in Heat Exchanger Trouble
F07Intermediate Temperature Sensor (C2) in Heat Exchanger Trouble
F08Outdoor Air Temperature Sensor (TO) Trouble
F12Compressor Inlet Suction Temperature Sensor (TS) Trouble
F31Outdoor Unit Nonvolatile Memory (EEPROM) Trouble
H01Primary (input) Overcurrent Detected
H02PAM Trouble
H03Primary Current CT Sensor (current sensor) Failure
H05Sensor Failure. Compressor Discharge Temperature Sensor (TD) Disconnected
H31HIC Trouble
L04Outdoor Unit Address Duplication
L10Outdoor Unit Capacity not Set
L13Indoor Unit Type Setting Error
L184-way Valve Operation Failure
P03Compressor Discharge Temperature Trouble
P04High Pressure Trouble
P05AC Power Supply Trouble
P13Alarm Valve Open
P1402 Sensor Detect
P15Insufficient Gas Level Detected
P16Compressor Overcurrent Trouble
P22Outdoor Unit Fan Motor Trouble
P29Lack of INV Compressor Wiring, INV Compressor Actuation Failure (including locked) due to DCCT Failure

Panasonic U-36LE1U6 air error codes

Alarm codeE06
Alarm meaninqOutdoor unit failed to receive serial communication siqnals from indoor unit.
Alarm conditionsNo serial communications from indoor unit
Probable cause(1) The indoor unit power was cut OFF after initial communications were completed.
(2) An open circuit or short circuit occurred in the inter-unit control wiring after initial communications were completed.
CheckCheck the power at the indoor and outdoor units, and check the inter-unit control wirinq.
NotesThis alarm is detected after initial communications are completed. Therefore, it does not occur in cases of 'disconnected serial connector V no terminal unit set, or other trouble that occurs before initial communications are completed. If initial communications have not been completed, alarm E04 occurs.
Alarm codeE12
Alarm meaningAutomatic address setting start is prohibited.
Alarm conditionsAutomatic address setting was started when automatic address setting was in progress at another outdoor unit in the same link.
Probable causeAutomatic address setting is in progress at another outdoor unit.
CheckThis alarm is not displayed on the remote controller. Therefore check the blinking LED display on the outdoor unit PCB.
CorrectionWait for automatic address setting to be completed at the outdoor unit where it is currently in progress. Then start automatic address setting again.
Alarm codeE15
Alarm meaninqAutomatic address settinq alarm (too few units)
Alarm conditionsThe number of indoor units was too few when automatic address setting was performed.
Probable cause(1) The number of indoor units set at the indoor unit quantity setting SW (S004) on the outdoor unit PCB is too many.
(2) The inter-unit control wiring between indoor units has been cut.
Check(1) check the indoor unit quantity setting SW (S004).
(2) Check the inter-unit control wiring at the indoor and outdoor units.
CorrectionAfter correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic address setting again.
Alarm codeE16
Alarm meaninqAutomatic address settinq alarm (too many units)
Alarm conditions• The number of indoor units was too many when automatic address setting was performed.
• After initial communications were completed, an unrecognized unit was detected.
Probable cause(1) The number of indoor unit setting SW (S004) on the outdoor unit PCB is too small.
(2) The inter-unit control wiring is wired incorrectly.
Check(1) check the number of indoor units that is set.
(2) Check the inter-unit control wirinq at the indoor and outdoor units.
CorrectionAfter correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic address setting again.
Alarm codeE20
Alarm meaninqNo indoor units at automatic address settinq.
Alarm conditionsWhen automatic address settinq was performed, no indoor units were recoqnized.
Probable cause(1) The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
(2) Serial connector 1 (CN32) is disconnected at the outdoor unit.
(3) The power is OFF at all indoor units in the system.
Check(1) Check whether the inter-unit control wiring from the outdoor unit to the indoor units is cut.
(2) Check whether serial connector 1 (CN32) is disconnected at the outdoor unit.
(3) Check the power at the indoor units.
Correction(1) Repair inter-unit control wiring from outdoor / indoor units.
(2) Plug connector 1 (CN32) in correctly.
(3) Turn on the power to indoor units.
Alarm codeE25
Alarm meaningOutdoor unit address setting failure (duplication)
Alarm conditionsCommunication by outdoor unit main-sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes.
Probable causeThe unit number is set incorrectly.
CheckCheck the unit number again.
CorrectionCorrect the incorrect unit number setting.
NotesRecovery from this alarm occurs automatically (when communication that contains the same address is not received for 3 minutes).
Alarm codeF04
Alarm meaningCompressor 1 discharge temperature sensor trouble
Alarm conditions(1) A temperature of 212°F (100°C) or higher was detected 20 minutes or longer after that compressor stopped running.
(2) Temperature is 176°F (80°C) or higher when the outdoor unit has been stopped for 60 minutes or longer.
Details are given in the servicing technical materials.
(3) A/D step is 10 steps or less (short circuit).
Probable cause(1) Sensor malfunction
• Sensor element malfunction
• Sensor wiring is partially disconnected, resulting in increased electrical resistance.
• This alarm does not occur when the wiring is completely cut or when the connector is not connected to the outdoor unit PCB.
(2) Outdoor unit PCB failure
(3) An air short blockage in the area around the outdoor unit has increased the outdoor unit ambient temperature, reducing the cooling effects after the compressor stops.
(4) There is a cause that results in P03 alarm.
(5) Electrical noise
Check(1) Sensor malfunction and outdoor unit PCB failure Trouble: • Constantly indicates a high temperature.
• When monitoring software or other means are used for monitoring, the discharge temperature at times fluctuates suddenly and wildly.
• In some cases, the precise temperature may not be known, even when monitoring software is used.
Check: • Wiggle the sensor and check whether the trouble continues.
• Check whether the connector is partially disconnected from the PCB.
• An F04 alarm will not result if the connector is completely disconnected (circuit is open).
(2) Leakage from the discharge tube check valve
Trouble: Although the other compressor is operating and this compressor is stopped, the
discharge temperature of this compressor rises together with the temperature of the other compressor.
(3) If the cause is still unknown after checking the above, then it is possible that electrical noise is the cause of the trouble. It is necessary to provide a line filter or carry out other noise countermeasures.
Correction(1) Replace the sensor.
(2) Carry out noise countermeasures.
(3) Adjust the amount of refrigerant.
(4) Correct the trouble.
Example(1) Sensor wirinq is partially cut.
NotesThis alarm does not indicate that the sensor is disconnected.
In order to prevent overheating during operation, the outdoor units in this system will not allow a compressor to start if the discharge temperature does not decrease while the compressor is stopped. If a sensor malfunction results in continuous detection of a high discharge temperature, then the compressor may stop for no apparent reason. The purpose of this alarm is to facilitate identification of the problem in this case.
Alarm codeF07
Alarm meaningLiquid temperature sensor (C1) trouble at outdoor heat exchanger
Alarm conditions(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit).
Probable cause(1) Sensor malfunction (including connector)
(2) PCB malfunction
Check(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer.
Alarm codeF08
Alarm meaningOutdoor air temperature sensor trouble
Alarm conditions(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
Probable cause(1) Sensor malfunction (including connector)
(2) PCB malfunction
Check(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer.
Alarm codeF12
Alarm meaningCompressor intake temperature sensor trouble
Alarm conditions(1) A/D step is 10 steps or less (short circuit).
(2) A/D step is 1014 steps or more (open circuit)
Probable cause(1) Sensor malfunction (including connector)
(2) PCB malfunction
Check(1) Measure the sensor resistance. Check that the sensor is operating normally.
(2) Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer.
Alarm codeF16
Alarm meaningHigh-pressure sensor trouble
Alarm conditionsThe saturation temperature at the detected pressure is 10 °F (5 °C) or more below the highest indoor-unit E1 temperature continuously for 30 minutes.
Probable cause(1) High-pressure sensor malfunction
(2) Failure to connect the connector to the outdoor unit PCB
(3) Failure to open the service valve
(4) Clogged tubing
(5) Valve leakage
(6) Over-charging
(7) Outdoor unit PCB failure
(8) Electrical noise
Check(1) High-pressure sensor failure
• Check for cut wiring.
• Connect a gauge to the high-pressure pressure outlet and check for changes in the value displayed by the monitoring software, and for large deviation of the gauge pressure.
• During heating, check whether the temperature is lower than the highest indoor-unit E1 temperature.
• The pressure detected by the high-pressure sensor is the highest pressure in the system. Therefore during heating the converted saturation temperature will never be lower than any indoor-unit E1 temperature. During cooling this temperature will never be lower
than the outdoor unit liquid temperature.
(2) Failure to open the service valve, clogged tubing, valve leakage, over-charging.
In all of these cases, an alarm occurs when there are rapid pressure fluctuations and tracking of the detected pressure is poor.
• Check the open/closed status of the valve.
• Check for valve leakage and over-charging
When valve leakage or over-charging occurs, refrigerant is likely to accumulate in the outdoor units or indoor units, resulting in a sudden rise in pressure at start that occurs before the refrigerant in the heat exchanger is discharged.
• The representative valve to check is a mechanical valve.
(3) Outdoor unit PCB failure
• The check items are the same as for a high-pressure sensor malfunction.
A normal PCB is needed to determine whether the problem is a PCB failure or a pressure sensor malfunction. If an abnormality was found at the check items for a high-pressure sensor malfunction, first try replacing the PCB and check again.
Trouble is corrected : Outdoorunit PCB failure
Trouble is not corrected : High-pressuresensor malfunction
Correction(1) Replace the high-pressure sensor.
Caution: Because the high-pressure sensor connection incorporates a Schrader-type valve, it can be removed and replaced. However, the high-pressure sensor can be easily damaged by high voltage; therefore use sufficient caution with regard to static electricity.
(2) Replace the PCB.
(3) Correct the locations of problems in the refrigeration cycle.
• Correct locations where clogging or leakage has occurred.
• In the case of over-charging, recover refrigerant. (Adjust the amount of refrigerant).
ExampleThis alarm may result when the service valve is closed or when valve leakage (particularly from the mechanical valve) occurs.
Alarm codeF31
Alarm meaningOutdoor unit non-volatile memory (EEPROM) trouble
Alarm conditions(1) Non-volatile memory is not present when power initialization occurs.
(2) Read values do not match after writing to non-volatile memory is complete.
Probable cause(1) Memory was not inserted after the PCB was replaced.
(2) The lifetime of the non-volatile memory has been reached.
(3) Non-volatile memory is installed incorrectly (wrong direction, bent pins, etc.).
Check(1) Check the non-volatile memory on the PCB.
Alarm codeH03
Alarm meaningCompressor CT sensor disconnected or short-circuit
Alarm conditionsAlarm occurs if the current value is 1.5 A or less when 2 seconds or longer have elapsed after output from that compressor started.
• No current is detected even though the compressor is operating.
Probable cause(1) CT circuit failure (including cut wiring, etc.)
(2) Disconnected CT circuit connector
(3) This CT circuit is connected to the connector of the other CT circuit.
(4) PCB failure
(5) Noise
Check(1) CT circuit failure. PCB failure
Trouble: • Current value during compressor operation is below the threshold value.
Check: • Check that the connector is not disconnected.
• Check the continuity of the CT circuit.
• Install a normal CT in place of this CT and check. If current is detected, then the PCB can be judged OK.
• CT circuit failure
• Check that current is flowing in the phase where the CT circuit is connected.
• Check voltage and current.
(2) Crossed wiring or installation error
Trouble: When the compressor is stopped, the current value at the other compressor is high.
(3) If the cause is still unknown after checking the above, then it is possible that noise is the cause of the trouble. It is necessary to connect a PC or other instrument.
Correction(1) Replace the CT circuit.
(2) Replace the outdoor unit PCB.
(3) Correct the problem.
Example(1) The connector was not inserted after the PCB was replaced.
NotesUse a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure.
Alarm codeL05
Alarm meaninqIndoor unit priority duplication (at priority indoor units)
Alarm conditionsMore than 1 indoor unit set for priority was detected.
Probable causeMore than 1 indoor unit is set for priority.
CheckFrom the wired remote controller, use the indoor unit EEPROM simple setting mode and check that the value of item code 04 is 0001
CorrectionUse the wired remote controller and correct the setting if the value of indoor EEPROM item code 04 is incorrect.
NotesThis alarm is displayed at the indoor units that are set for priority. Alarm L06 is displayed at the indoor units that are not set for priority.
Alarm codeL06
Alarm meaninqIndoor unit priority duplication (at non-priority indoor units) and outdoor unit
Alarm conditionsMore than 1 indoor unit set for priority was detected in the system.
Probable causeMore than 1 indoor unit is set for priority in the system.
CheckFind the indoor units where alarm L05 has occurred in the system.
Correction
NotesAlarm L06 occurs as a result of alarm L05. When the duplicated priority settings are corrected, alarm L06 is also corrected.
Alarm codeL10
Alarm meaningOutdoor unit capacity not set
Alarm conditionsThe outdoor unit capacity has not been set, or the setting is not allowed by the system.
Probable causeThis alarm occurs because the capacity has not been set.
CheckConnect the outdoor unit maintenance remote controller. On the outdoor unit EEPROM detailed setting mode screen, check the value for the outdoor unit capacity (item code 81). Check that it is not set to "O" or to a capacity that is not allowed.
CorrectionIf item code 81 is incorrect, use the outdoor unit maintenance remote controller and set it correctly.
• After chanqinq the settinq. be sure to reset both the indoor and outdoor power.
NotesThe outdoor unit maintenance remote controller is required in order to set the capacity in the outdoor unit EEPROM.
Alarm codeL18
Alarm meaning4-way valve operation failure
Alarm conditionsDuring heating, when 2 minutes and 30 seconds have elapsed after compressor operation started, the temperature difference between the outdoor air temperature sensor and the heat exchanger liquid temperature sensor (C1) is 40 °F (20 °C) or higher.
Probable cause(1) The 4-way valve connector (20S CN005) has become disconnected from the control PCB.
(2) The 4-way valve circuit is locked (malfunctioning).
Check(1) Check the 4-way valve connector (20S CN005).
(2) If the connector is normal, check the 4-way valve wiring and the PCB circuit.
CorrectionIf the connector is normal, correct or replace the problem locations.
Alarm codeP03
Alarm meaningCompressor discharge temperature trouble
Alarm conditionsInverter compressor: Temperature is 222 °F (106 °C) or higher and pre-trip stop has occurred.
Probable cause(1) Insufficient amount of refrigerant (including trouble resulting from an insufficient initial charge and from gas leakage)
Blocking of low-pressure parts caused by intrusion of foreign objects (moisture, scale, etc.)
(2) Expansion valve operation failure
(3) Compressor discharge sensor failure
(4) PCB failure (A/D conversion failure)
(5) Electrical noise
Check(1) Insufficient refrigerant
Trouble: Liquid effectiveness is poor.
Check: Check whether or not the superheating temperature is declining if the evaporator mechanical valve is opened to 300 pulses or more (after checking for foreign object intrusion).
(2) Sensor failure
Check: • This alarm is likely to occur when wiring is partially cut. (It can be difficult to identify, even when conductivity is checked.) The detected discharge temperature is high.
• Although such conditions rarely occur, a P02 alarm is likely if the detected discharge temperature is low.
• Replace the sensor with another discharge sensor and compare the temperature conditions.
(3) If the cause is still unknown after checking the above, then it is possible that electrical noise
is the cause of the trouble.
Correction(1) Replace the sensor.
(2) Replace the outdoor unit PCB.
(3) Correct the problem locations.
ExampleAll of the probable causes
NotesOperates continuously for a set length of time.
Indicates 2 minutes 30 seconds or longer for an inverter unit.
Alarm codeP16
Alarm meaningInverter compressor overcurrent alarm
Alarm conditionsThis alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of less than 80 Hz after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 48 A or hiqher is detected).
Probable causeThere is a strong possibility of a compressor failure.
An alarm occurs for current detection trouble when it is judged that no current is flowing after start (DCCT is damaqed). In this case, the cause is a DCCT failure.
CheckCheck the power wirinq and connector wirinq.
CorrectionIt is possible to resolve this trouble by limitinq the maximum frequency.
Alarm codeP22
Alarm meaningFan motor trouble
Alarm conditionsFan motor start failure, fan motor Hybrid IC input failure
Probable causePossible causes are a Hybrid IC input circuit failure or a fan HIC failure.
CheckCheck the fan motor wiring, the Hybrid IC wiring, and the connector connections. If the wiring and connectors are normal, then check that the capacitor of the Hybrid IC input circuit is securely soldered onto the PCB. Also use a tester and measure the resistance between fan HIC power (HIC+) and ground (HIC-). If there is a short circuit, there is an HIC malfunction.
CorrectionIf the fan does not start, the below corrections may be effective.
(1) If there is a fan HIC failure or circuit failure, replace the PCB.
(2) If the fan motor is locked, replace the fan motor.
NotesTurn OFF the power, and check the conductivity of V and on the main PCB.
Alarm codeP26
Alarm meaningInverter compressor high-frequency overcurrent alarm
Alarm conditionsThis alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of 80 Hz or higher after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 48 A or higher is detected).
Probable causeThe detection methods are the same as for P16. However the fact that operation up to high frequencies is possible does not necessarily mean that a compressor failure is the cause of the trouble. Start the compressor several times. If alarm P26 occurs every time and alarm P16 does not occur at all, then the possibility of a compressor failure is low.
CheckCheck the power wiring and connector wiring.
CorrectionIt is possible to resolve this trouble by limiting the maximum frequency.
Alarm codeP29
Alarm meaningInverter compressor missing phase or lock alarm
Alarm conditionsThis alarm may occur at start, and occurs when missing phase or lock is detected, and when a DCCT failure occurs.
Probable causeGenerally this alarm occurs when the refrigerant pressure balance is uneven at start, when inverter compressor lock occurs, there is a missing phase in the inverter compressor wiring, or a DCCT failure occurs. This can be judged to be starting trouble which is not caused by HIC.
CheckCheck the power wiring and connector wiring.
CorrectionDCCT failure (replace PCB) or compressor failure
NotesUse a tester to measure the voltage between the DCCT output terminal on the rear of the PCB and the ground. If the voltaqe is not within 2 - 3 V. then the DCCT has malfunctioned.

Panasonic U-72MF1U9 air error codes

Alarm codeAlarm meaning
E06Outdoor unit failed to receive serial communication siqnals from indoor unit.
E12Automatic address settinq start is prohibited.
E15Automatic address settinq alarm (too few units)
E16Automatic address setting alarm (too many units)
E20No indoor units at automatic address setting.
E24Outdoor unit (INV) failed to receive communications from another outdoor unit (constant-speed).
E25Outdoor unit address settinq failure (duplication)
E26Mismatch in outdoor unit quantity
E29Outdoor unit failed to receive communication from relay control unit
F04Compressor 1 discharge temperature sensor trouble
F05Compressor 2 discharge temperature sensor trouble
F06Gas temperature sensor trouble at outdoor heat exchanger 1 (In)
F07Liquid temperature sensor trouble at outdoor heat exchanqer 1 (Out)
F08Outdoor air temperature sensor trouble
F12Compressor intake temperature sensor trouble
F16High-pressure sensor trouble
F17Low-pressure sensor trouble
F23Gas temperature sensor trouble at outdoor heat exchanqer 2 (In)
F24Liquid temperature sensor trouble at outdoor heat exchanqer 2 (Out)
F31Outdoor unit non-volatile memory (EEPROM) trouble
H03Compressor 1 CT sensor disconnected or short-circuit.
H11Constant speed compressor 2 over current alarm
H12Constant speed compressor 2 lock current alarm
H06Low-pressure trouble in refrigerant circuit.
H07No oil alarm
H08Compressor 1 oil detection sensor (connection) trouble
H13Compressor 2 CT sensor disconnected or short-circuit
H15Compressor 2 discharge temperature sensor disconnected
H27Compressor 2 lock current alarm
H31HIC trouble alarm
L04Outdoor unit address duplication
L10Outdoor unit capacity not set
L17Outdoor unit model mismatch
P03Compressor 1 discharge temperature trouble
P04High-pressure switch activated
P05Reverse phase (or missinq phase) detected
P16Compressor 1 over current
P17Compressor 2 discharge temp trouble
P22Fan motor trouble
P26Inverter compressor hiqh-frequency over current alarm
P29Inverter compressor missinq phase or lock alarm

Panasonic WH-MDC05F3E5 air error codes

Diagnosis displayAbnormality/Protection controlAbnormality judgementPrimary location to verify
H00No abnormality detected
H12Indoor/Outdoor capacity unmatched90s after power supply• Indoor/outdoor connection wire
• Indoor/outdoor PCB
• Specification and combination table in cataloque
H15Outdoor compressor temperature sensor abnormalityContinue for 5 sec.• Compressor temperature sensor (defective or disconnected)
H20Water pump abnormalityContinue for 10 sec.• Indoor PCB
• Water pump (malfunction)
H23Indoor refrigerant liquid temperature sensor abnormalityContinue for 5 sec.• Refrigerant liquid temperature sensor (defective or disconnected)
H27Service valve errorContinue for 5 minutes• High pressure sensor (defective or disconnected)
H42Compressor low pressure abnormality• Outdoor pipe temperature sensor
• Clogged expansion valve or strainer
• Insufficient refrigerant
• Outdoor PCB
• Compressor
H62Water flow switch abnormalityContinue for 1 min.• Water flow switch
H64Refrigerant high pressure abnormalityContinue for 5 sec.• Outdoor high pressure sensor (defective or disconnected)
H65Deice circulation errorContinue for 10 sec.• Water flow switch sensor (defective or disconnected)
• Water pump malfunction
• Buffer tank (is used)
H70Back-up heater OLP abnormalityContinue for 60 sec.• Back-up heater OLP (Disconnection or activated)
H72Tank sensor abnormalContinue for 5 sec.• Tank sensor
H76Indoor - control panel communication abnormality• Indoor - control panel (defective or disconnected)
H90Indoor/outdoor abnormal communication> 1 min after starting operation• Internal/external cable connections
• Indoor/Outdoor PCB
H91Tank heater OLP abnormalityContinue for 60 sec.• Tank heater OLP (Disconnection or activated)
H95Indoor/Outdoor wronq connection• Indoor/Outdoor supply voltaqe
H98Outdoor high pressure overload protection• Outdoor high pressure sensor
• Water pump or water leakage
• Clogged expansion valve or strainer
• Excess refrigerant
• Outdoor PCB
H99Indoor heat exchanger freeze prevention• Indoor heat exchanger
• Refriqerant shortaqe
F12Pressure switch activate4 times occurrence within 20 minutes• Pressure switch
F14Outdoor compressor abnormal revolution4 times occurrence within 20 minutes• Outdoor compressor
F15Outdoor fan motor lock abnormality2 times occurrence within 30 minutes• Outdoor PCB
• Outdoor fan motor
F16Total running current protection3 times occurrence within 20 minutes• Excess refrigerant
• Outdoor PCB
F20Outdoor compressor overheating protection4 times occurrence within 30 minutes• Compressor tank temperature sensor
• Clogged expansion valve or strainer
• Insufficient refrigerant
• Outdoor PCB
• Compressor
F22I PM (power transistor) overheating protection3 times occurrence within 30 minutes• Improper heat exchange
• I PM (Power transistor)
F23Outdoor Direct Current (DC) peak detection7 times occurrence continuously• Outdoor PCB
• Compressor
F24Refrigeration cycle abnormality2 times occurrence within 20 minutes• Insufficient refrigerant
• Outdoor PCB
• Compressor low compression
F25Cooling/Heating cycle changeover abnormality4 times occurrence within 30 minutes• 4-way valve
• V-coil
F27Pressure switch abnormalityContinue for 1 min.• Pressure switch
F30Water outlet sensor 2 abnormalityContinue for 5 sec.• Water outlet sensor 2 (defective or disconnected)
Diagnosis displayAbnormality/Protection controlAbnormality judgementPrimary location to verify
F36Outdoor air temperature sensor abnormalityContinue for 5 sec.• Outdoor air temperature sensor (defective or disconnected)
F37Indoor water inlet temperature sensor abnormalityContinue for 5 sec.• Water inlet temperature sensor (defective or disconnected)
F40Outdoor discharge pipe temperature sensor abnormalityContinue for 5 sec.• Outdoor discharge pipe temperature sensor (defective or disconnected)
F41PFC control4 times occurrence within 10 minutes• Voltage at PFC
F42Outdoor heat exchanger temperature sensor abnormalityContinue for 5 sec.• Outdoor heat exchanger temperature sensor (defective or disconnected)
F43Outdoor defrost sensor abnormalityContinue for 5 sec.• Outdoor defrost sensor (defective or disconnected)
F45Indoor water outlet temperature sensor abnormalityContinue for 5 sec.• Water outlet temperature sensor (defective or disconnected)
F46Outdoor Cunent Transformer open circuit• Insufficient refrigerant
• Outdoor PCB
• Compressor low
F48Outdoor EVA outlet temperature sensor abnormalityContinue for 5 sec.• Outdoor EVA outlet temperature sensor (defective or disconnected)
F49Outdoor bypass outlet temperature sensor abnormalityContinue for 5 sec.• Outdoor bypass outlet temperature sensor (defective or disconnected)
F95Cooling high pressure overload protection• Outdoor high pressure sensor
• Water pump or water leakage
• Clogged expansion valve or strainer
• Excess refrigerant
• Outdoor PCB

Back to Top