Lessar air conditioners are equipped with an automatic troubleshooting function. Having detected a malfunction, the system issues an error code of the Lessar air conditioner on the front panel of the indoor unit. The error code is a special combination of flashing LEDs. The error of the Lessar air conditioner is displayed until measures are taken to eliminate it.
Error Codes for Lessar Air Conditioners in Cold Mode
| Air conditioner error Lessar | Diode Work | Diode Timer |
| Indoor unit fan does not operate for one minute | blinks | — |
| The supply of electricity to the thermosensor of the evaporator or the temperature in the room is interrupted | blinks | is burning |
| Invalid voltage applied to compressor four times in a row | — | blinks |
| Lessar air conditioner error: failure of the central control board | blinks | blinks |
| ROM failure | is burning | blinks |
Error Codes for Lessar Air Conditioners in Warm Mode
| Lessar air conditioner error | Diode Defrost | Diode Work | Diode Timer |
| Invalid voltage applied to compressor four times | blinks | blinks | — |
| Lessar air conditioner error: indoor unit fan does not work for one minute | blinks | — | blinks |
| No voltage or short circuit on the evaporator sensor | blinks | — | — |
| The supply of electricity to the temperature sensor in the room is interrupted | — | — | blinks |
| Center board failure | — | blinks | blinks |
| ROM failure | — | is burning | blinks |
What to do if after turning on the power, the device does not turn on and no air conditioner error codes light up Lessar:
- Make sure the fuse is intact;
- Make sure that 220 volts is supplied to the air conditioner. If there is no power supply on the primary side of the transformer, the indoor module board should be replaced. If the voltage is normal, check the secondary winding. If the result is positive, it is necessary to replace the board of the indoor module. If negative, make sure there is 14.5 volts at the transformer output. If the answer is negative, the transformer should be replaced.
If the Operation indicator is off after power is applied, the Timer indicator blinks:
- Install another control board. If this does not help, the indoor module board should be replaced. If it helps, then the voltage in the network is low.
If the Run light is on and the Timer light is blinking, it means that the EEPROM is faulty, to fix this error in the Lessar unit, you need to change the PCB board.
