Service diagnosis
39 Domestic air conditioner
10.3.8 Power Supply Over or under voltage fault
Outdoor display: LED1 flash 6 times The power supply is over voltage
●
M
ethod of
An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit.
Malfunction
Detection
Malfun
ction
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
p
arts damage may be occurred.
Electrify the machine again and turn it on with
the remote controller. Check whether the
compressor is started normally
●
Is it ok?
●
Yes
Maybe there is some disturbance
NO
●
No
~230 is ok?
Yes
Yes
This question may be caused by the power. Repair
the power supply.
NO
Change the IPM module
Change the IPM module
Test the outdoor power supply
(+310VDC) with a multimeter.
check whether the power
is >150 V or <390V?
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