Indoor / Outdoor Units Communication Error - Heat Controller A-VMH18DC-1 Service Manual

Service Manual

9.3.1.2 Indoor / outdoor units communication error

Check wiring on the outdoor
and indoor terminal follow the
wiring diagram. Are all wires
connected correctly?
Turn on all indoor units with
the remote controller. Are
no.
correct? Refer to PIC 5.
Are number of indoor units
correct?
outdoor check point (18). (2
for dual zone, 3 for tri zone, 4
for qua zone). Refer PIC 5.
No, fist time
Change
assembly(include wiring) totally
Power off , then Power on the A/C by the
Breaker. Did E1 error code turn off?
No
Yes
of outdoor units
Yes
Turn off the all indoor
units. Is IPM power LED
lamp On? Refer PIC 3
Yes
Is PFC power LED lamp
off? Refer PIC 3.
Yes
Reconnect the wiring
No
Is Main board
" " lamp on?
Refer PIC 4
Yes
Check on the
outdoor unit PCB
VMH SerieS
Yes
No
Measure Vs, is it moving
No
alternately between positive
value and negative value?
(Vs is the voltage between
S and L2) Refer PIC 1
Yes
No
change
IPM
No
change
PFC
No
No
Is the reactor
connecting well？
Yes
Change Outdoor Main
PCB
Yes
No, second time
SEE A
28
Reconnect the wiring
Reconnect the wiring
No
A:
Is all the wiring
between terminal
and Indoor PCB
connected ok?
Yes
Change the
Indoor PCB
Power on by remote
controller, has the E1
error code ended
after 3 minutes?
Yes
E1 error problem solved.
Heat Controller, Inc.
No