Air Conditioner Service Manual
45
3.2.4 E3, E7 or E8----ODU Coil temperature sensor, Ambient temperature sensor or Discharge
temperature sensor failure.
When any of the sensor resistance open or short circuit , unit will display failure code as E3, E7 or E8, IDU and ODU
turns off. When the sensor resistance recovery, unit revert to be standby, customer can switch on the unit directly.
Start
Display E3, E7 or E8
Re-connect
Is the sensor well connected
to ODU PCB ?
Multi-meter check the
sensor resistance.
Open or short circuit?
Replace sensor
Yes
Yes
End
Replace ODU PCB
No
No
Problem solved ?
Problem solved?
No
Yes
Yes
No
