Power Supply Over Or Under Voltagve Fault - Haier HSU12 Service Manual

7.3.9 Power Supply Over or under voltagve fault

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
the IPM module is broken
the outdoor PCB is broken
Caution Be sure to turn off power switch before connect or disconnect connector,
Check the power supply
Is it rated power?
Yes
Check the IPM
module
Is it normal?
Yes
Change the outdoor PCB
HSU12/18VHJ(DB)
LED1 flash 6 times
Supply voltage not as specified
or else parts damage may be occurred.
No
This question may be caused by the
power
No
Change the new one
66
Functions and control
Domestic Air Conditioner