This manual is applicable only to the following models.
Lennox Air Conditioner Inverter Split Type Error Codes;
LNIV2610 LNIV3510 LNIV5010 LNIV6510
Indoor Unit Error Display:
| Error Codes | Cause |
|---|---|
| E0 | EEPROM parameter error |
| E1 | Indoor/outdoor units communication protection |
| E2 | Zero-crossing signal error |
| E3 | Indoor fan speed out of control |
| E5 | Open or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error |
| E6 | Open or short circuit of room or evaporator temperature sensor |
| E7 | Outdoor fan speed out of control |
| P0 | IBM malfunction or IGBT over-strong current protection |
| P1 | Over voltage or too low voltage protection |
| P2 | Temperature protection of compressor top |
| P4 | Inverter compressor drive error |
Lennox Split AC Error Codes
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.
Meaning of Each Error
| Error Codes | Meaning |
|---|---|
| F1 | Return air temperature sensor open/ short circuited |
| P6 | Drive board communication error |
| F2 | Evaporator temperature sensor open/ short circuited |
| H3 | Compressor overheating protection |
| b5 | Indoor unit liquid valve temperature sensor open/short circuited |
| LP | Indoor and outdoor units unmatched |
| b7 | Indoor gas valve temperature sensor open/ short circuited |
| dn | Communication line misconnected or expansion valve error |
| P7 | IPM temperature sensor open/short circuited |
| E7 | Running mode conflict |
| F3 | Outdoor ambient temperature sensor open/ short circuited |
| Fo | Pump-down |
| F4 | Outdoor unit condenser mid-tube temperature sensor open/short circuited |
| C5 | Jumper error |
| F5 | Discharge temperature sensor open/ short circuited |
| H1 | Forced defrosting |
| E6 | Indoor and outdoor communication error |
| Lc | Compressor startup failure |
| PL | DC bus under-voltage protection...... |
| E4 | High discharge temperature protection |
| PH | DC bus over-voltage protection |
| E8 | Overload protection |
| U1 | Compressor phase current sensing circuit error |
| E5 | Whole unit over-current protection |
| HE | Compressor demagnetization protection |
| P5 | Over phase current protection |
| Hc | PFC protection |
| H7 | Compressor desynchronizing |
| P8 | IPM Temperature Protection |
| H5 | IPM Current protection |
| L9 | Over-power protection |
| Ld | Compressor phase loss/reversal protection |
| F0 | System charge shortage or blockage protection |
| F8 | Frequency restricted/reduced with whole unit current protection |
| PU | Capacitor charging error |
| IPM | Frequency restricted/reduced with |
| En | Current protection |
| E1 | High pressure protection |
| F9 | Frequency restricted/reduced with high discharge temperature |
| E3 | Low pressure protection |
| FH | Frequency restricted/reduced with antifreezing protection |
| LE | Compressor stalling |
| F6 | Frequency restricted/reduced with overload protection |
| LF | Over-speeding |
| EU | Frequency restricted/reduced with IPM temperature protection |
| PF | Drive board temperature sensor error |
| E9 | Indoor unit full water error |
| P9 | AC contactor protection |
| E2 | Anti-freezing protection |
| PE | Temperature drift protection |
| PP | AC input voltage abnormal |
| Pd | Sensor connection protection |
| U5 | Whole unit current sensing circuit error |
| U3 | DC bus voltage drop error |
| U7 | 4-way valve reversing error |
| L3 | Outdoor fan 1 error protection |
| H6 | Motor stalling |
| LA | Outdoor fan 2 error protection |
| U8 | PG motor zero-crossing protection |
Lennox Air Conditioner Mini Split Error Codes
Indoor and Outdoor Error Codes
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:
- Whether remote controller is within the signal receiving range?
- Whether there are obstacles?
- Whether remote controller is pointing at the receiving window?
- Is sensitivity of remote controller low; fuzzy display and no display?
- No display when operating remote controller?
- Fluorescent lamp in room?
Solution:
- Signal receiving range is 8m.
- Remove obstacles.
- Select proper angle and point the remote controller at the receiving window on indoor unit.
- Check the batteries. If the power of batteries is too low, please replace them.
- Check whether remote controller appears to be damaged. If yes, replace it.
- Take the remote controller close to indoor unit.
Phenomenon: No air emitted from indoor unit
Check items:
- Air inlet or air outlet of indoor unit is blocked?
- Under heating mode, indoor temperature is reached to set temperature?
- Heating mode is turned on just now?
Solution:
- Eliminate obstacles.
- After reaching to set temperature, indoor unit will stop blowing out air.
- 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:
- Power failure?
- Is plug loose?
- Air switch trips off or fuse is burnt out?
- Wiring has malfunction?
- Unit has restarted immediately after stopping operation?
- Whether the function setting for remote controller is correct?
Solution:
- Wait until power recovery.
- Reinsert the plug.
- Ask professional to replace air switch or fuse.
- Ask professional to replace it.
- Wait for 3min, and then turn on the unit again.
- 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:
- Voltage is too low?
- Filter is dirty?
- Set temperature is in proper range?
- Door and window are open?
Solution:
- Wait until the voltage resumes normal.
- Clean the filter.
- Adjust temperature to proper range.
- 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.
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