Haier T-Series Service Manual page 40

10.3.8 Power Supply Over or under voltage fault
Outdoor display: LED1 flash 6 times
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.
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else
Turn on the unit.
Check whether the compressor running normal?
Test the power supply of P & N
terminal on outdoor PCB.
check whether the power is >390V
or <150V?
Check whether the outdoor
power supply is ok?
This question may be caused by the power. Repair
the power supply.
The power supply is over voltage
parts damage may be occurred.
Is it ok?
No
NO
NO
Yes
The power supply is instability.
Yes
Replace power module
Replace power module
Yes
39
Seivice diagnosis
Domestic air conditioner