Lennox AC Error Codes

If any error occurs in your air conditioner, indoor display shows error codes. Once you nail down the issue you can easily call in a professional, or fix the issue yourself. To help you out we have listed down the most common error codes of Lennox AC.

Indoor Unit Error Display

Lennox Split AC

If there is an error occurring during the operation of the system, the error code will be displayed on the LCD, as show in Fig.5.1. If multi errors occur at the same time, their codes will be displayed circularly.

Note: In event of any error, please turn off the unit and contact the professionally skilled personnel.

Lennox Air Conditioner Mini Split

Indoor and Outdoor Error Codes

Lennox Rooftop

Climatic 50 Roof-Top, Aircoolair & Compactair Version 24

Lennox AC Troubleshooting

Please check below items before asking for maintenance.

Phenomenon: Indoor unit can’t receive remote controller’s signal or remote controller has no action.

Check items:

1. Whether remote controller is within the signal receiving range?
2. Whether there are obstacles?
3. Whether remote controller is pointing at the receiving window?
4. Is sensitivity of remote controller low; fuzzy display and no display?
5. No display when operating remote controller?
6. Fluorescent lamp in room?

Solution:

1. Signal receiving range is 8m.
2. Remove obstacles.
3. Select proper angle and point the remote controller at the receiving window on indoor unit.
4. Check the batteries. If the power of batteries is too low, please replace them.
5. Check whether remote controller appears to be damaged. If yes, replace it.
6. Take the remote controller close to indoor unit.

Phenomenon: No air emitted from indoor unit

Check items:

1. Air inlet or air outlet of indoor unit is blocked?
2. Under heating mode, indoor temperature is reached to set temperature?
3. Heating mode is turned on just now?

Solution:

1. Eliminate obstacles.
2. After reaching to set temperature, indoor unit will stop blowing out air.
3. In order to prevent blowing out cold air, indoor unit will be started after delaying for several minutes, which is a normal phenomenon.

Phenomenon: Air conditioner can’t operate

Check items:

1. Power failure?
2. Is plug loose?
3. Air switch trips off or fuse is burnt out?
4. Wiring has malfunction?
5. Unit has restarted immediately after stopping operation?
6. Whether the function setting for remote controller is correct?

Solution:

1. Wait until power recovery.
2. Reinsert the plug.
3. Ask professional to replace air switch or fuse.
4. Ask professional to replace it.
5. Wait for 3min, and then turn on the unit again.
6. Reset the function.

Phenomenon: Mist is emitted from indoor unit’s air outlet

Check items: Indoor temperature and humidity is high?

Solution: Because indoor air is cooled\rapidly. After a while, indoor temperature and humidity will be decrease and mist will disappear.

Phenomenon: Cooling ( heating) effect is not good

Check items:

1. Voltage is too low?
2. Filter is dirty?
3. Set temperature is in proper range?
4. Door and window are open?

Solution:

1. Wait until the voltage resumes normal.
2. Clean the filter.
3. Adjust temperature to proper range.
4. Close door and window.

Phenomenon: Outdoor unit has vapor

Check items: Heating mode is turned on?

Solution: During defrosting under heating mode, it may generate vapor, which is a normal phenomenon.

Phenomenon: ”Water flowing” noise

Check items: Air conditioner is turned on or turned offjust now?

Solution: The noise is the sound of \refrigerant flowing inside the unit, which is a normal phenomenon.

Phenomenon: Cracking noise

Check items: Air conditioner is turned on or turned offjust now?

Solution: This is the sound of frictioh caused by expansion and/or contraction of panel or other parts clue to the change of temperature.

Lennox Air Conditioner Manual PDF

Lennox Rooftop Service Manual