Midea MFE-60ARN1-RB4W Service Manual page 51

Power off, then turn on the unit 5 seconds
later(reconnect the power wire).Is the error
still displaying after several minutes?
Yes
Check all the wirings between indoor and
outdoor, indoor PCB and outdoor PCB
following the wiring diagram. Are all the
wirings connected correctly?
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
Is the wiring to the outdoor PCB
connected correctly?
Yes
Change the outdoor main PCB.
Power on. Is the error extinguished?
Change the indoor main PCB.
No
Is the wiring to the indoor PCB
connected correctly?
Change the indoor main PCB.
Power on. Is the error extinguished?
Change the outdoor main PCB.
48
No
Yes
No