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7.3.10 Power Supply Over or under voltagve fault
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An abnormal voltage rise or fall is detected by checking the specified voltage detection FLUFXLW
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An voltage signal is fed from the voltage detection circuit to the microcomputer
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&DXWLRQ Be sure to turn off power switch before connect or disconnect connector, or else
Check the power supply
Is it rated power?
Yes
Check the IPM
module
Is it normal?
Yes
Change the outdoor PCB
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LED1 flash 6 times
Supply voltage not as specified
the IPM module is broken
the outdoor PCB is broken
parts damage may be occurred.
No
No
This question may be caused by the
power
Change the new one
74
Service Diagnosis
Domestic Air Conditioner
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