Midea MO11MU-09HRDN1

Oasis Inverter DM12-01.01.10en
54 Service manual
11.2.2 Indoor / outdoor units communication error
Power off, then power on the A/C by
the breaker. (Reconnect the power
wire). Is the E1 extinguished?
Check the wiring on the outdoor
terminal and indoor terminal follow
the wiring diagram. Is all the
connecting correctly?
-24V<Vs<+24V?
(Vs is the voltage between S and N).
No
Is the wiring to the outdoor PCB
connecting correctly?
Yes
Change the outdoor PCB
Yes
Power on. Is the E1 extinguished
after 3 minutes?
No
Is the wiring to the indoor PCB
connecting correctly?
No
Yes
Change the indoor PCB
Power on. Is the E1 extinguished
after 3 minutes?
No
Change the indoor PCB
Change the outdoor PCB
Yes