Haier 1U25MECFRA-3 Service Manual page 43

10.3.8 Power Supply Over or under voltage fault
Outdoor display:
Method of An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit.
Malfunction
Detection
Malfunction An voltage signal is fed from the voltage detection circuit to the microcomputer
Decision
Conditions
Supposed ■ Supply voltage not as specified
Causes ■ the IPM module is broken
■ the outdoor PCB is broken
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else
Electrify the machine again and turn it on with
the remote controller. Check whether the
compressor is started normally
Test the outdoor power supply
(+310VDC) with a multimeter.
check whether the power
is >150 V or <390V?
This question may be caused by the power. Repair
the power supply.
LED1 flash 6 times
parts damage may be occurred.
Is it ok?
No
NO
Yes
~230 is ok?
NO
The power supply is over voltage
Yes
Maybe there is some disturbance
Yes
Change the IPM module
Change the IPM module
41
Service diagnosis
Domestic air conditioner