Power Supply Over Or Under Voltage Fault - Haier HSU-18HEA03/R2(DB)-I Service Manual

7.3.10 Power Supply Over or under voltagve 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,
Check the power supply
Is it rated power?
Check the IPM
module
Is it normal?
Yes
Change the outdoor PCB
About how to check the IPM module,please refer to IPM protection fault
HSU-18HEA03/R2(DB)-I
LED1 flash 6 times
Supply voltage not as specified
the IPM module is broken
the outdoor PCB is broken
else parts damage may be occurred.
No
Yes
No
The power supply is over voltage.
This question may be caused by the
power
Change the new one
69
Service Diagnosis
or
Domestic air conditioner