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Service diagnosis
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7.4.8 Power Supply Over or under voltagve fault
outdoor
display
:
LED1 flash 6 times The power supply is over voltage
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 Ŷ
Supply voltage not as specified
Causes Ŷ
the IPM module is broken
Ƶ
the outdoor PCB is broken
1) Check whether Terminal CN23 and CN24 on the outdoor mainboard
CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and outdoor
Are they good?
Electrify the machine again and turn it
on, Check whether the voltage between
1 and 2 of Terminal CN23 is about
DC5V, Check whether the voltage
between2 and 3 of Terminal CN23 is
about DC15V,
Replace the outdoor mainboard with a new one
Replace the outdoor IPM module
with a new one.
YES
NO
NO
YES
Malfunction unsolved
1) Pull out and reinsert the terminals.
2) Replace connected wire
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