21 Lessar air conditioner error codes + troubleshooting

Since day one, Lessar is proving itself to be a reliable company in manufacturing air conditioners. They are continuously making designs in systems that are economical and bring the best experience a person can have. They spend a lot of resources on quality assurance personnel and designers so that the resultant system has a unique style and new features that can withstand the market. One feature can be found in all of their models known as Self-Diagnosis.

This feature is solely for customer convenience as it displays a specific error code that indicates a particular issue in the system. To save you from the hassle of finding the cause and solution for each error code separately, we have gathered all of that in this single article. Always seek the assistance of a professional technician, if the error is not DIY solvable or you don’t have the necessary knowledge of the electronics and HVAC system.

Lessar air conditioner error code E0

Causes:

This error is triggered on the AC system when/if:

1. There are some issues with the flow sensor.
2. The flow sensor of either unit has a short circuit.

Solutions:

1. Restart the AC unit after keeping it OFF for 1-3 minutes.
2. Make sure that the sensor is not bent and is properly installed where it should be.
3. Check the resistance coefficient of the sensor and if it is weak, replace it with a strong one.
4. Check the wiring between the sensor and the main PCB for any damages. Repair or replace the wiring where needed.
5. Check the sensor for any faults. Replace the sensor if defective.
6. If the error persists, check the main PCB for malfunctioning. Replace the board if faulty.

Lessar air conditioner error code E1

Causes:

This error is displayed on the AC system when/if:

1. Wrong phase rotation is performed or the 3-phase sequence is wrong.
2. Power supply terminals between the phases and system are loose.
3. The power supply is malfunctioning.
4. Main PCB is faulty.

Solutions:

1. Verify that the 3-phase rotation or sequence is correct. If wrong, exchange wires of any two phases until the sequence is corrected.
2. Repair the power supply terminals and ensure they are properly connected where intended. Replace terminals if broken.
3. Check the power supply for any faults. Repair or replace as needed
4. Inspect the main PCB and if it is at fault, replace the board thoroughly.

Lessar air conditioner error code E2

Causes:

This error is reported by the AC system when/if:

1. The communication line between the indoor and outdoor units has issues.
2. Different parts or components of the same unit can’t communicate.
3. The communication wire between indoor and outdoor units is broken.
4. The main PCB of the indoor or outdoor unit is malfunctioning.

Solutions:

1. Verify that the communication wire between the indoor and outdoor units is in good shape. Repair the wire if needed.
2. Check the main PCB of indoor and outdoor units for malfunctioning. Replacing either of the PCBs if faulty.

Lessar air conditioner error code E3

Causes:

This error is triggered on the AC system when/if:

1. The temperature sensor of direct water has some issues.
2. The direct water temperature sensor has a short circuit.
3. The temperature sensor is bent or displaced from its intended position.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E4

Causes:

This error is displayed on the AC system when/if:

1. An issue is occurring in the temperature sensor of the shell-and-tube heat exchanger.
2. The sensor on the heat exchanger has a short circuit.
3. The sensor is displaced from its position.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E5

Causes:

This error is reported by the AC system when/if:

1. The temperature sensor located on the condenser pipe A of the unit is not working.
2. There was a short circuit on the temperature sensor of condenser pipe A.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E6

Causes:

This error is triggered on the AC system when/if:

1. The temperature sensor on condenser pipe B is malfunctioning.
2. There was a short circuit on the temperature sensor located on the condenser pipe B.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E7

Causes:

This error is displayed on the AC system when/if:

1. The temperature sensor of the outdoor unit is not functioning accurately.
2. The outdoor unit temperature sensor has a short circuit causing a burn or complete failure.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E8

Causes:

This error is reported by the AC system when/if:

1. There is some issue with the compressor discharge temperature sensor of either unit.
2. The temperature sensor of the compressor is bent and has a short circuit.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code E9

Causes:

This error is triggered on the AC system when/if:

1. Some problem is occurring in the duct temperature sensor of system A.
2. The system A duct temperature sensor has a short circuit.
3. The temperature sensor is displaced or bent.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code E0”.

Lessar air conditioner error code EA

Causes:

This error is displayed on the AC system when/if:

1. When the master and slave units of the AC system are unable to communicate.

Solutions:

1. Try the exact solutions (for Master and Slave units as you do for indoor and outdoor units) as suggested for the Lessar air conditioner “Error Code E2”.
2. If the error persists, Contact an HVAC engineer to check communication paths and ensure they are in good shape.

Lessar air conditioner error code P0

Causes:

This error is reported by the AC system when/if:

1. The temperature or pressure in the compressor of system A is getting out of range.
2. The compressor of system A is overheating.

Solutions:

1. Give the AC unit a rest for 15-30 minutes by turning it OFF.
2. Clean the air filters, and fans for any clogging or restrictions. Replace either of the components if damaged.
3. Check the temperature sensor on the compressor and ensure it is in good shape. Replace it if it is malfunctioning.

Lessar air conditioner error code P1

Causes:

This error is triggered on the AC system when/if:

1. The compressor pressure of system A is going below the normal limit.
2. The cut-off valve is clogged or partially closed.
3. The low-pressure sensor on the compressor has gone bad.
4. The refrigerant level in the AC unit is less than required.

Solutions:

1. Make sure that liquid, gas, and cut-off valves are clean and fully opened.
2. Clean the evaporator, coils, air filters, and system pipeline to remove any clogging or restrictions.
3. Run the indoor and outdoor fans at maximum speed for at least a few minutes. 
4. Check the pressure sensor and if it is malfunctioning, replace it with a new one.
5. Level up the refrigerant charge in the system.

Lessar air conditioner error code P2

Causes:

This error is displayed on the AC system when/if:

1. The temperature or pressure in the compressor of system B is exceeding the normal range.
2. The compressor of system B is overheating.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code P0”.

Lessar air conditioner error code P3

Causes:

This error is reported by the AC system when/if:

1. The compressor pressure of system B is going down.
2. The cut-off valve is clogged or not fully opened.
3. The low-pressure sensor on the compressor is malfunctioning.
4. The refrigerant level has decreased.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code P1”.

Lessar air conditioner error code P4

Causes:

This error is triggered on the AC system when/if:

1. The current being supplied into system A is exceeding the normal range.
2. The power cord is damaged or not properly connected.
3. The power supply is faulty.

Solutions:

1. Check the input current and ensure it is consistent and not fluctuating.
2. Check the electrolytic capacitor and replace it if weak or faulty.
3. Check the power cord and ensure that it is properly plugged in.
4. Check the power supply for any faults. Repair or replace if it is faulty.

Lessar air conditioner error code P5

Causes:

This error is displayed on the AC system when/if:

1. There is an over-current condition in system B.
2. Voltages to system B are fluctuating.
3. The power cord is damaged or not properly connected.
4. The power supply is faulty.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code P4.

Lessar air conditioner error code P6

Causes:

This error is reported by the AC system when/if:

1. There is an increase in the condensation temperature of system A.

Solutions:

1. With the help of a technician, check and ensure that the heat exchanger, evaporator, condenser, and all such components are properly installed and connected to their intended positions.
2. Clean the fans and run them at full speed for some time.
3. Clean the cooling coils to wipe off the dirt and debris build-up.
4. Check the condensation or coil temperature sensor for any faults. Replace the sensor if needed.

Lessar air conditioner error code P7

Causes:

This error is triggered on the AC system when/if:

1. The condensation temperature of system B is exceeding the normal range.

Solutions:

1. Try the exact solutions as suggested for the Lessar air conditioner “Error Code P6”.

Lessar air conditioner error code P8

Causes:

This error is displayed on the AC system when/if:

1. The temperature of the compressor is rising.

Solutions:

1. Restart the air conditioner after giving it a rest until it cools down completely.
2. Try the exact solutions as suggested for the Lessar air conditioner “Error Code P6”.
3. Check the compressor for any faults. Repair or replace the compressor if needed.

Lessar air conditioner error code Pb

Causes:

This error is reported by the AC system when/if:

1. The system is working on protection against frost.

This is not an error but a message by the system that the AC unit is running a defrost process.

Solutions:

1. Wait for a few minutes as the error will go down once the defrost process is completed, after a few minutes.
2. Clean the condenser, condenser coils, evaporator, air filters, and fans. Repair or replace components if faulty.
3. Run the outdoor fan at full speed.
4. Inspect the main PCB for any malfunctioning. Replace the PCB if it is faulty.