Haier HSU-18,22HVA103/R2(DB) Service Manual page 88

7.2.10 Power Supply Over or under voltagve fault
Indoor display
outdoor display :
An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit.
Method of
Malfunction
Detection
An voltage signal is fed from the voltage detection circuit to the microcomputer
Malfunction
Decision
Conditions
Supposed ■ Supply voltage not as specified
Causes ■ the IPM module is broken
■ the outdoor PCB is broken
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
Check the power supply
Is it rated power?
Check the IPM
module
Is it normal?
Change the outdoor PCB
About how to check the IPM module, please refer to IPM protection fault
HSU-18,22HVA103/R2(DB)
F19
LED1 flash 6 times
Yes
else parts damage may be occurred.
No
No
Yes
This question may be caused by the power
Change the new one
87
Service Diagnosis
or
Domestic Air Conditioner