Haier N-Series, Service Manual

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Seivice diagnosis
Domestic air conditioner
11.4.8 Power Supply Over or under voltage fault
Electrify the machine again and turn it on with
the remote controller. Check whether the
compressor is started normally
Is it ok?
Yes
Maybe there is some disturbance
NO
No
~230 is ok?
Yes
Yes
This question may be caused by the power. Repair
the power supply.
NO
Change the IPM module
Change the IPM module
Test the outdoor power supply
(+310VDC) with a multimeter.
check whether the power
is >150 V or <390V?
Method of
malfunction detection
Malfunction detection
conditions
Troubleshooting
An abnormal voltage rise or fall is detected by checking the specified voltage detection
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.
Ŷ
The outdoor PCB is broken.
Supposed causes
* Caution
Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
LED1 flash 6 times The power supply is over voltage Outdoor diplay
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