Power Supply Over Or Under Voltage Fault - Haier HSU-09RS03/R2(SDB) Service Manual

7.4.10 Power Supply Over or under voltage fault

Indoor display
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
T roubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else parts
Check the power supply
Is it rated power?
Yes
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-09/12RS03/R2(SDB)
F19
LED1 flash 6 times
Supply voltage not as specified
the IPM module is broken
the outdoor PCB is broken
damage may be occurred.
No
No
Change the new one
This question may be caused by the
power
63
Service Diagnosis
Domestic air conditioner