Haier 1U09BS2ERA - Power Supply over or under Voltage Fault

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7.4.10 Power Supply over or under voltage fault 
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Indoor display F19
Outdoor display: LED1 flash 6 times
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Domestic air conditioner
Method of
malfunction
detection
Malfunction
detection
conditions
Supposed
causes
Troubleshooting
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Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
ƵSupply voltage not as specified
ƵThe IPM module is broken.
Ƶ The outdoor PCB is broken.
An abnormal voltage rise or fall is detected by specified voltage checking
detection circuit
An voltage signal is feedback from the voltage detection circuit to the
microcomputer
NO
House power supply fault.
Change the new one
Change the outdoor PCB
Is it rated value?
NO
YES
YES
Check the power supply
Check the IPM
module, Is it normal?