Haier N Series Service Manual page 58

. .8 Power Supply Over or under voltage fault
Outdoor display:
Method of
malfunction detection
An voltage signal is fed from the voltage detection circuit to the microcomputer
Malfunction detection
conditions
Conditions
Supposed
Causes
Troubleshooting
Electrify the machine again and turn it on with
the remote controller. Check whether the
compressor is started normally
This question may be caused by the power. Repair
LED1 flash 6 times
abnormal voltage rise or fall is detected by checking the specified voltage detection circuit.
■ Supply voltage not as specified
■ the IPM module is broken
■ the outdoor PCB is broken
* Caution Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
Is it ok?
No
Test the outdoor power supply
(+310VDC) with a multimeter.
check whether the power
is >150 V or <390V?
NO
~230 is ok?
NO
the power supply.
The power supply is over voltage
Yes
Yes
Change the IPM module
Yes
Service diagnosis
Maybe there is some disturbance
Change the IPM module
Domestic air conditioner