Heat Controller A-VMH18DC-1 - Indoor; Outdoor Units Communication Error

28
Service Manual VMH SerieS Heat Controller, Inc.
9.3.1.2 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
w
iring diagram. Are all wires
connected correctly?
Turn on all indoor unit
s with
the remote controller.
Are
no. of outdoor units
correct? Refer to PIC 5.
Measure Vs, is it 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
Power off , then Power on the A/C by the
Breaker. Did E1 error code turn off?
change
IPM
No
No
Yes
Yes
Are number of indoor units
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 terminal
and Indoor PCB
connected ok?
change
PFC
No
Yes
No
Change the
Indoor PCB
Yes
Po
wer on by remote
controller, has
the E1
error code ended
after 3 minutes?
E1 error problem solved.
Is the r
eactor
connecting well？
Reconnect the wiring
C
hange Outdoor Main
PCB
No No
Yes
Change
outdoor unit PCB
assembly(include wiring) totally
No, second time
SEE A
Yes
Yes
Yes