Aiwa -09CHSRINV/TP11 Service Manual page 42

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.
Air Conditioner Service Manual
Start
Display E3, E7 or E8
Is the sensor well connected
to ODU PCB ?
Yes
Multi-meter check the
sensor resistance.
Open or short circuit?
No
Replace ODU PCB
End
No
Re-connect
Problem solved ?
No
Yes
Replace sensor
Problem solved?
No
Yes
Yes
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