Yes
Yes
Measure Vs, is it moving alternately
between positive value and negative
value?
(Vs is the voltage between S and N of
outdoor unit.)
Yes
Power off, then turn on the unit 5 seconds
later(reconnect the power wire).Is the error
still displaying after several minutes?
No
Yes
Change the outdoor main PCB.
Power on. Is the error extinguished?
Check all the wirings between indoor and
outdoor, indoor PCB and outdoor PCB
following the wiring diagram. Are all the
wirings connected correctly?
Change the indoor main PCB.
Yes
Change the outdoor main PCB.
No
Is the wiring to the outdoor PCB
connected correctly?
Power on. Is the error extinguished?
Change the indoor main PCB.
No
Is the wiring to the indoor PCB
connected correctly?
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