Power Supply Over Or Under Voltage Fault - Haier 1U12BE2ERA Service Manual

11.4.8 Power Supply Over or under voltage fault

Outdoor diplay
Method of
malfunction detection
Malfunction detection
conditions
Supposed causes
Troubleshooting
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 21 times
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
■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
NO
~230 is ok?
NO
The power supply is over voltage
YES
Maybe there is some disturbance
Change the IPM module
YES
Change the IPM module
YES
46
Installations
Domestic air conditioner