Toshiba Air Conditioner Troubleshooting

The Toshiba brand is known for its quality, but any technique is not immune from failure. How to determine the cause of failure by the error code? The tables below are devoted to breakdowns of 6 models of Toshiba air conditioners. Even if your model does not have a system of error codes, you can choose a way to repair it with the help of description of the failure.

Toshiba WK0511CMU Air Conditioner Troubleshooting

Air conditioner does not startWall plug disconnected. Push plug firmly into wall outlet.
House fuse blown or circuit breaker tripped. Replace fuse with time delay type or reset circuit breaker.
Plug current device tripped. Press the RESET button.
Power is OFF. Turn power ON and set to desired setting.
Unit turned off and then on quickly.Turn unit off and wait 3 minutes before restarting.
Air from unit does not feel cold enoughRoom temperature below 17°C (62°F). Cooling may not occur until room temperature rises above 17°C (62°F).
Temperature sensing element touching cold coil, located behind air filter. Straighten tube away from coil.
Reset to a lower temperature.
Compressor shut-off by changing modes. Wait approximately 3 minutes and listen for compressor to restart when set in the COOL mode.
Airconditioner cooling, but room is too warm- ice forming on cooling coil behind decorative frontOutdoor temperature below 18°C (64°F).To defrost the coil, set to FAN ONLY mode.
Air filter may be dirty. Clean filter.
Thermostat set too cold for night-time cooling. To defrost the coil, set to FAN ONLY mode. Then, set temperature to a higher setting.
Air conditioner cooling, but room is too warm- NO ice forming on cooling coil behind decorative frontAir filter may be dirty. Clean filter.
Temperature is set too high, set temperature to a lower setting.
Air directional louvers positioned improperly. Position louvers for better air distribution.
Front of unit is blocked by drapes, blinds, furniture, etc. - restricts air distribution. Clear obstruction in front of unit.
Doors, windows, registers, etc. open- cold air escapes. Close doors, windows, registers.
Unit recently turned on in hot room. Allow additional time to remove "stored heat" from walls, ceiling, floor and furniture.
Air conditioner turns on and off rapidlyDirty air filter- air restricted. Clean air filter.
Outside temperature extremely hot. Set FAN speed to a higher setting to bring air past cooling coils more frequently.
Noise when unit is coolingThis is normal. Air movement sound. If too loud, set to a slower FAN setting.
Window vibration - poor installation.
Water dripping INSIDE when unit is coolingImproper installation. Tilt air conditioner slightly to the outside to allow water drainage.
Water dripping OUTSIDE when unit is coolingUnit removing large quantity of moisture from humid room. This is normal during excessively humid days.
Remote sensing deactivating prematurely (some models)Remote control not located within range. Place remote control within 20 feet & 180°, radius of the front of the unit.
Remote control signal obstructed. Remove obstruction.
Room too coldTemperature setting too low. Increase temperature setting.

Toshiba SM562KRT Air Conditioner Troubleshooting

Check codePossible causes
E01 E02 E03Reception error
E08 E09Duplication of indoor unit No 1 invalid setting
E18Poor connection/contact between indoor units or indoor unit power OFF (Communication error between header and follower indoor units or between twin header and follower indoor units)
E04Wrong connection or poor contact between indoor unit and outdoor unit (Communication error between indoor and outdoor units)
P12Failure of indoor unit DC fan (Protection device of indoor unit is activated.)
P03Abnormal outdoor unit discharge temperature
P04Outdoor unit high-pressure system error ,
P19Four-way valve system error (judged by indoor unit)
P22Outdoor unit: Malfunction of fan
P26Outdoor unit: Inverter Idc activated
P29Outdoor unit: Position detect error
P31Header and follower indoor units in the group are not running due to the following alarm. (Alarm code: E03, L03, L07, L08)
F01Heat exchange sensor (TCJ) error
F02Heat exchange sensor (TC) error Indoor unit sensor error
F10Room temperature sensor (TA) error
F 04Discharge temperature sensor (TD) error
F06 Temperature sensor (TE, TS) error
F08Outside air temperature sensor (TO) error
F29Failure of indoor unit EEPROM
H01Compressor breakdown Compressor locking
H02Current detect circuit error
H03Outdoor unit low-pressure error

Toshiba AP0072H Air Conditioner Troubleshooting

OperationCheck Items
Compressor does not operate.• Is not delayed for 3 minutes? (3 minutes after compressor-OFF)
• Is not thermostat OFF?
• Is not the fan operating or timer?
• Is not the system initially communicating?
Indoor fan does not work.• Is not the cold draft prevention being controlled in heating operation?
Outdoor fan does not rotate, or• Is not low cooling operation being controlled?
fan speed changes.• Is not a defrost operation being performed?
Indoor fan does not stop.• Is not after-heat elimination operation being controlled after heating operation?
Start/stop operation on remote controller is unavailable.• Is not auxiliary unit or remote control being operated?
• Is connecting wire of indoor unit or remote controller correct?

Toshiba RAS10JAVP Air Conditioner Troubleshooting

Problem Solution
Inoperative• The power main switch is turned off.
• The circuit breaker is activated to cut off the power supply.
• The main power fuse has blown.
• The electric current has stopped.
• The batteries in the remote control used up.
• The ON timer is set.
• As a protective mechanism for the air conditioner, it does not operate for three minutes immediately after restarting operation or turning on the main power
Poor cooling or heating performance• The air inlet or outlet of the outdoor unit is blocked.
• Doors or windows are opened.
• The air filter is clogged with dust.
• The louver is not at the correct position.
• The fan speed is set to low.
• The air conditioner is set to the DRY or ECO mode.
• The temperature setting is too high (during cooling operation).
• The temperature setting is too low (during heating operation).
Condensation forms on the back of the indoor unit.• Condensation on the back of the indoor unit is automatically collected and drained out
Indoor unit or outdoor unit makes a strange noise.• When the temperature changes sharply, the indoor or outdoor unit may make a strange noise (such as a tit-tack noise or flowing noise) because of the expansion/contraction of parts or change in refrigerant flow
A bad odor comes from the air conditioner.• Smells absorbed in the wall, carpet, furniture, clothing, or furs are coming out.
• During PAP operation, a small amount of ozone is produced, and you might notice the smell
The OPERATION indicator turns on and off.• The indicator turns on and off (1 Hz) when power is restored after a power failure or when the power main switch is set to on. Reset the circuit breaker to ON.
Frost forms on the outdoor unit during heating operation. Water is drained from the outdoor unit.• Frost sometimes forms on the outdoor unit during heating operation. In that case, the unit automatically performs defrosting (for 2 to 10 minutes) for improving the heating efficiency
• In the defrosting operation, the airflow from both the indoor and outdoor units stops.
• A hiss sound is heard when the flow of the refrigerant is changed for defrosting.
• The water resulting from automatic defrosting during the heating operation is drained from the outdoor unit
The air flow changes even though the FAN button is not set to the AUTO mode.• When the temperature of the blown air goes down during heating operation, the air conditioner automatically changes or stops the air flow from the indoor unit so that the people in the room do not feel chilly
A white mist of chilled air or water is generated from the outdoor unit.• Steam is sometimes generated from the indoor unit during cooling operation or the outdoor unit during defrosting operation
Automatic operation of vertical air flow louvers• When the room temperature or outdoor temperature is high during the heating operation, the vertical air flow louvers close once and then set themselves automatically to the original position setting again

Toshiba VNK502HEXE Air Conditioner Troubleshooting

Wired Remote controller displayAuxiliary code7 segment display on the outdoor unitCheck code name
E01Indoor unit - remote controller communication error (Detected by remote controller)
E02Remote control transmission error
E03Indoor unit - remote controller communication error (Detected by indoor unit)
E04Indoor / Outdoor unit communication circuit error (Detected by indoor unit)
E06E06Number of indoor units for normal receptionNumber of indoor units decreasing
E07Indoor / Outdoor unit communication circuit error (Detected by outdoor unit)
E08E08Duplicate indoor addressesDuplicate indoor addresses
E09Duplicate header remote controllers
ЕЮIndoor MCU communication error
E12E1201 : Indoor / Outdoor unit communication 02: Communications between outdoor unitsAutomatic address start error
E15E15No indoor unit during automatic address
E16E1600: Over capacityNumber of connected units / Over capacity
01 ~: Number of connected
E18Indoor header - follower communication error
E19E1900: No center unit 02: Multiple center unitsUnusual number of center outdoor units
E20E2001 : Outdoor connections of another lineConnections of another line during automatic address
02: Indoor connections of another line
E21E2102: No header unit 00: Number of duplicate header unitsUnusual number of thermal header units
E22E22Number of thermal units decreasing
E23E23Transmission error between outdoor units Number of thermal units error (Reception error)
E25E25Duplicate terminal outdoor address settings
E26E26Number of outdoor units for normal receptionNumber of connected outdoor units decreasing
E28E28Detected outdoor unit No.Terminal outdoor error

Toshiba RAS 18LAH Air Conditioner Troubleshooting

TroubleCheck PointsAction
Unit does not operateCheck that the power cad is plugged into the wall outlet.Insert the power cord into the wall outlet.
Has the circuit breaker tripped or has the fuse blown?Reset the circuit breaker or replace the fuse with the specified replacement fuse.
Has there been a power faiure?Restart operation when power is resumed.
Does the “UNIT ON' lamp flash on and off?Call your service representative.
Is the voltage too tow?Confirm the available voltage.
Cooling ts abnormaly low.Is the filter blocked with dust?Clean the air filter.
Has the temperature been set properly?Check and reset it if necessary.
Are the windows or doors open?Close the windows and doors.
Is anything obstructing the outdoor unit?Remove the obstruction.
Is the fan speed too low?Change the fan speed selectbn.
Is the operation mode FAN or AUTO?Change to cooling operatbn or reset the temperature.
Heating is abnormaly low.Is the filter blocked with dust?Clean the air filter.
Has the temperature been set too bw?Check and reset it if necessary.
Are the windows or doors open?Close the windows and doors.
Is anything obstructing the outdoor unit?Remove the obstruction.
Unit stops during operatbn.Is the OFF timer operating?Restart the unit operation.
Has passed the set time of sleep timer?Restart the unit operation.
If the above actons do not correct the operatbn, consult the dealer from whom you bought the unit.

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