Mitsubishi air error codes

The information about malfunctions simplifies repairs and above all, protects the entire Mitsubishi air conditioner system against serious damages, which could arise if an air conditioner operated with malfunctions, which Mitsubishi air error codes indicate. Decoding of all possible Mitsubishi equipment error codes is provided by our site. Just look into the table below.

Mitsubishi MXZ-32SV air error codes

DisplayDetecting methodDetecting methodCheck points
(A4)Outdoor power system abnormalityWhen the compressor operation has been interrupted by overcurrent protection continuously three times within 1 minute after start-up, the compressor stops operation.• Inverter output
• Compressor
(A3)Outdoor electronic control P.C. board abnormalityWhen the nonvolatile memory data cannot be read properly on the outdoor controller board• Outdoor electronic control P.C. board
(P1)Indoor unit and LEV abnormalityWhen the drain abnormality is detected in the indoor unit and the indoor main coil temperature is too low, or when any abnormality is detected in the components of indoor unit• Check the abnormality indication on the indoor unit.
•LEV
(E9)Evaporation temperature thermistor abnormalityThe compressor stops when a short or open circuit occurs in the evaporation temperature thermistor during compressor running.• Check the characteristic of the evaporation temperature thermistor.
• Check the contact of P. C. board connectors.
(E6)Discharge temperature thermistor abnormalityThe compressor stops when a short or open circuit occurs in the discharge temperature thermistor during compressor running.• Check the characteristic of the discharge temperature thermistor.
• Check the contact of P. C. board connectors.
(F8)Fin temperature thermistor abnormalityThe compressor stops when a short or open circuit occurs in the fin temperature thermistor during compressor running.• Check the characteristic of the fin temperature thermistor.
• Check the contact of P.C. board connectors.
(A8)Overcurrent protectionWhen over current is applied to the power module, the compressor stops and restarts in 3 minutes.• Check the inverter and compressor.
• Check the amount of gas.
• Check the indoor/outdoor air flow for short cycle.
• Check the indoor unit air filter for clogging.
(d6)Discharge temperature overheat protectionWhen the discharge temperature thermistor detects 116’C or above, the compressor stops and restarts operation in 3 minutes.• Check the amount of gas and the refrigerant cycle.
(Protection will be released at 'lOO'C or below.)• Check the outdoor unit air passage.
(d4)Fin temperature overheat protectionWhen the fin temperature thermistor detects 89°C or above, the compressor stops and restarts operation in 3 minutes.• Check the outdoor unit air passage.
• Check the power module.
• Check the outdoor fan motor.
(d7)High pressure protectionWhen the compressor starts, primary current or output voltage stops the compressor and restarts in 3 minutes.• Amount of gas
• Outdoor unit air passage.
• Check the ball valve.
(F5)Room-A gas pipe temperature thermistor abnormalityWhen a short or open circuit occurs in the Room-A gas pipe temperature thermistor.• Room A gas pipe temperature thermistor characteristic.
• Contact of P.C. board connectors.
(F6)Room-B gas pipe temperature thermistor abnormalityWhen a short or open circuit occurs in the Room-B gas pipe temperature thermistor.• Room B gas pipe temperature thermistor characteristic.
• Contact of P.C. board connectors.
(F7)Room-C gas pipe temperature thermistor abnormalityWhen a short or open circuit occurs in the Room-C gas pipe temperature thermistor.• Room C gas pipe temperature thermistor characteristic.
• Contact of P.C. board connectors.
(P9)Room-D gas pipe temperature thermistor abnormalityWhen a short or open circuit occurs in the Room-D gas pipe temperature thermistor.• Room D gas pipe temperature thermistor characteristic.
• Contact of P.C. board connectors.
(d8)Frequency drop by current protectionWhen the outdoor unit input current exceeds 22.5 A, the compressor operates at reduced frequency.
(d9)Frequency drop by overload protectionWhen the compressor load exceeds the specified value, the compressor operates at reduced frequency.These symptoms do not mean any abnormality of the product, but check the following points.
•Air filter clogging.
(d7)Frequency drop by high pressure protection
Frequency drop by defrosting in cooling
When indoor pipe temperature exceeds 55°C during heating, the compressor operates at reduced frequency.
When the indoor pipe temperature falls to 6’C or below during cooling, the compressor operates at reduced frequency.
• Amount of gas.
• Short cycle of indoor/outdoor air flow.
(d6)Frequency drop by discharge temperature protectionWhen the discharge temperature exceeds 110’C, the compressor operates at reduced frequency.
(d3)Frequency drop by high pressure switch protectionWhen the high pressure exceeds 2.75MPa (28 kgf/cm2-G), the compressor operates at reduced frequency. In addition, the fan speed changes.• Amount of gas.
• Outdoor unit air passage.
(d1)Low discharge temperature protectionWhen the state with low discharge temperature of which 50°C in COOL and 48.4 or less in HEAT for 20 minutes, the compressor operates continuously.Check the amount of gas.
• Replace the outdoor controller board.
• Check the contact of LEV board connectors.
(E7)Defrost thermistor abnormalityWhen a short or open circuit occurs in the defrost thermistor during heating• Defrost thermistor characteristic.
In this case, the compressor continues to operate.• Contact of P. C. board connectors.
(h4)Power factor detection abnormalityWhen the compressor power factor cannot be detected. In this case, the compressor keeps running.• Compressor wiring.

Mitsubishi PK12FK air error codes

Check codeDiagnosis of malfunctionCauseCheck points
EOSignal transmitting/receiving error
(Indoor controller does not respond to remote controller signal.)

During individual unit control
1) Bad contact of transmission wire
2) Signal transmitting/receiving circuit is abnormal.
1) Check the transmission wire.
2) Check with another remote controller. If "E0" is still indicated, replace the indoor controller board.
If other check code appears, replace the original remote controller.
P1Abnormality of room temperature thermistor (RT1)1) Bad contact of thermistor
2) Damaged thermistor
1) Check the thermistor.
2) Measure the resistance of the thermistor. Normal resistance should be as follows. 32°F-15, 86°F-4.3,
50°F-9.6, 104°F-3.0
P2Abnormality of indoor coil thermistor (RT2)If the resistance is normal, replace the indoor controller board.
P3Signal transmission error (Remote controller does not respond to indoor controller signal.)1) Bad contact of transmission wire
2) Signal transmitting/receiving circuit is abnormal.
3) Wrong operation due to noise wave emitted by other appliances
1) Check the transmission wire.
2) Check with another remote controller.
If “P3" is still indicated, replace the indoor board.
If other check code appears, replace the original remote controller.
3) Short-circuit between ZD and GD of CN40 and attach CN40 to the following units.
• Second unit in twin control
• Second and third units in triple control
• Sub units in group control
P4Abnormality of drain sensor1) Bad contact of transmission wire
2) Damaged thermistor

1) Check the connector.
2) Measure the resistance of the thermistor CD SI. 32T-6, 59°F-3.2, 86°F-1.8, 41T-4.8, 68°F-2.6, 95°F- 1.5, 50°F-3.9, 77°F-2.2, 104°F-1.3
If the resistance is normal, replace the indoor controller board.
P5Malfunction of drain pump1) Malfunction of drain pump
2) Damaged drain sensor
1) Check the drain pump.
2) Check the drain sensor.
(Check the drop of water is on.)
If the resistance is normal, replace the indoor controller board.
P6Freezing protection/ overheating protection is working.1) Short cycle of air cycle
2) Dirty air filter
3) Damaged fan
4) Abnormal refrigerant
1) Clear obstructions from the air cycle.
2) Clean the air filter
3) Check the fan.
4) Check the refrigerant temperature.
P7System error1) Wrong address-setting
2) Signal transmitting/receiving circuit of remote controller is abnormal.
3) Wrong SW6-setting
1) Check the address-setting.
2) Check with another remote controller. If check code other than “P7” appears, replace the original remote controller.
3) Check SW6 setting.
P8Abnormality in outdoor unit1) Wrong wiring of indoor/outdoor connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil thermistor
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil thermistor. If the resistance is normal, replace the outdoor controller board.

Mitsubishi SUZ-KA35VA air error codes

Check codeBeeper sounds/OPERATION INDICATOR lamp blinks (Number of times)Symptom
P11Intake sensor error
P22Pipe (TH2) sensor error
P9Pipe (TH5) sensor error
E6, E73Indoor/outdoor unit communication error
P44Drain sensor error/Float switch connector open
P55Drain pump error
P66Freezing/Overheating protection operation
EE7Communication error between indoor and outdoor units
P88Pipe temperature error
E4, E59Remote controller signal receiving error
-10-
-11-
Fb12Indoor unit control system error (memory error, etc.)
EO, E3-Remote controller transmission error
E1, E2-Remote controller control board error
E91Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP2Compressor overcurrent interruption
U3,U43Open/short of outdoor unit thermistors
UF4Compressor overcurrent interruption (When compressor locked)
U25Abnormal high discharging temperature/insufficient refrigerant
U1,Ud6Abnormal high pressure (63H worked)/Overheating protection operation
U57Abnormal temperature of heat sink
U88Outdoor unit fan protection stop
U69Compressor overcurrent interruption/Abnormal of power module
U710Abnormality of super heat due to low discharge temperature
U9.UH11Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error
-12-
-13-
Others14Other errors

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