HSU12HG(DB)-SM Service Diagnosis
61
Domestic Air Conditioner
7.3.9 Power Supply over or under voltage fault
Indoor display
F19
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.
The outdoor PCB is broken.
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
About how to check the IPM module, please refer to IPM protection fault.
No
This question may be caused by the
power.
Change the new one
Change the outdoor PCB
Check the power supply
Is it rated power?
No
Yes
Check the IPM
module
Is it normal?
Yes
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