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Confirm if outdoor fan motor is running; unplug the three
connecting wires between U, V, W of compressor and
power module. Turn on the unit to see if outdoor fan runs
normally (more than 3 minutes)
Outdoor fan stops running.
Measure the voltage of outdoor
fan connector
No voltage
Change main board
of outdoor unit
Outdoor fan
With voltage
Replace the fan
motor
—98—
Confirm if there is voltage output and balance of
runs.
voltage between any two phases of U, V and W.
Yes
Whether module type
is correct
Abnormal
al
Replace the module
with correct type
Normal
See Whether cylinder
of compressor is stuck
If the unit runs normally after connected
with the new compressor for trial run, the
cylinder of original compressor is stuck
Replace the power
module
Norm
Measure 3-phase
resistance for compressor .
Abnormal
Replace compressor
No
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