Maintenance; Failure Code - Lennox LM012CI-100V433 Service Manual

3. Maintenance

3.1 Failure code

Code
IDU Room Temperature sensor failure.
E1
（IDU RT failure）
IDU Coil temperature sensor failure.（IDU
E2
IPT failure）
E4 Gas not enough
E5 System protection
IDU PG Fan motor / DC fan motor works
E6
abnormal（IDU failure）
P7 Overheating protection on Heating mode.
Air Conditioner Service Manual
Reason Remark
IDU sensor and PCB.
IDU sensor and PCB.
Please check the pressure in cooling
For the high/low pressure valve model
Fan motor, fan blade and PCB.
Please check the troubleshooting for detail.