Midea M2OD-14HFN1-Q Service Manual page 44

10.3.1.2 Indoor / outdoor units communication error
Indoor / outdoor units communication error
Start: Power off , then Power on the
A/C by the Breaker. (reconnect the
power wire). Is it still displaying the
error code?
Check wiring on the outdoor and indoor
terminal follow the wiring diagram. Is all
connecting correctly?
Turn on all indoor unit by remote
controller. Is all indoor unit display
Turn off the all indoor units. Is IPM
power LED or operating LED lamp
On? Refer PIC2
Is main board"
lamp on? Refer PIC 3.
Is indoor units number correct? Check
on the outdoor check point . (2 for dual
zone, 3 for tri zone, 4 for qua zone,5 for
qui zone). Refer PIC 4.
No first time
Replacee outdoor unit PCB assembly(include
wiring) totally
Yes
No
Yes
No
Yes
Yes
No
Yes
"
No
Yes
No second time
Reconnect the wiring
Reconnect the wiring
Measure Vs, is it moving
alternately between positive value
and negative value? (Vs is the
voltage between S and N). Refer
PIC 1
Yes
Replace IPM board or
the outdoor main PCB
Is the reactor connecting
No
well？
Yes
Replace the outdoor main PCB
A
No
A:
Is all the wiring between
No
terminal and Indoor PCB
connect ok?
Yes
Replace the Indoor PCB
Power on by remote
controller, I
displaying the error code
after 3 minutes?
Reconnect the wiring
No
Trouble is solved
No
Is it still