Midea M2OC1-18HRDN1-Q

8.3.1.2 Indoor / outdoor units communication error
No
No fist time
Yes
Yes
No
Reconnect the wiring
Check wiring on the outdoor
and indoor ter
minal follow
the wiring
diagram. Is all
connecting correctly?
Turn on all indoor unit
by remote controller.
Is
all indoor unit display
Measure Vs, is i
t moving
alternately between positive
value and negative value?
(Vs is the voltage between
S and L2). Refer PIC 1
Turn off the all indoor
units. Is IPM power LED
lamp On? Refer PIC 3
Is PFC power LED lamp
off? Refer PIC 3.
No
Yes
Start: Power off , then Power on the A/C by the
Breaker. (reconnect the power wire). Is E1
extinguish?
change
IPM
No
No
Yes
Yes
Is indoor units number
correct? C
heck on the
outdoor check poi
nt (18). (2
for dual zone, 3 for tri
zone, 4
for qua zone). Refer PIC 5.
Is Main board
“ "
lamp on?
Refer PIC 4.
Reconnect the wiring
No
A:
Is all the wiring
between t
erminal
and Indoor PCB
connect ok?
change
PFC
No
Yes
No
change the
Indoor PCB
Yes
Power on by remote
controller, Is the E1
extinguish after 3
m
i
n
u
tes?
E1 error problem solved. The unit
operation normally.
Is the Reactor
connection.
Reconnect the wiring
C
hange Outdoor Main
PCB
No
No
Yes
Change
outdoor unit PCB
assembly(include wiring) totally
No second time
A
Yes
Yes