7.2.10 Power Supply Over or under voltagve 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
Yes
This question may be caused by the power
Change the new one
Change the outdoor PCB
Check the power supply
Is it rated power?
Check the IPM
module
Is it normal?
No
No
Yes
HSU-18,22HVA103/R2(DB) Service Diagnosis
87
Domestic Air Conditioner
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