Power Supply Over Or Under Voltage Fault - Haier 1U50S2SJ2FA Service Manual

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
Causes
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
Supply voltage not as specified
the IPM module is broken
the outdoor PCB is broken
parts damage may be occurred.
Is it ok?
No
NO
~230 is ok?
NO
The power supply is over voltage
Yes
Yes
Change the IPM module
Yes
Change the IPM module
41
Service diagnosis
Maybe there is some disturbance
Domestic air conditioner