Service diagnosis
39
Domestic air conditioner
An voltage signal is fed from the voltage detection circuit to the microcomputer
Ŷ
Supply voltage not as specified.
Ŷ
The IPM module is broken.
* Caution
Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
10.4.9 Overheat Protection For Discharge Temperature
Outdoor display: F4:LED1 flash 8 times
Turn on the unit.
Check whether the compressor running normal?
Is it ok?
Yes
The power supply is instability.
NO
No
Check whether the
outdoor power supply is
Yes
Yes
This question may be caused by the power. Repair
the power supply.
NO
Replace power module
Replace power module
Test the power supply of P & N
terminal on outdoor PCB.
check whether the power is >390V
or <150V?
Malfunction
Detection
Conditions
Troubleshooti
ng
Supposed
Causes
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