Communication Malfunction Between Ipm Board And Outdoor Main Board - Heat Controller A-VMH18DC-1 Service Manual

Heat Controller, Inc.
9.3.2.3 Communication malfunction between IPM board and outdoor main board(ODU E7)
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
Check the signal wire between
the IPM module and the main
board, is it connected good?
Reconnect and retry. Is
displaying?
error still display?
Replace IPM board, and
then check whether the
system can run normally
Replace outdoor main
board, and then check
whether the system can run
normally
Replace the electric control
lit?
No
No
No
No
No
box
VMH SerieS
Yes
Yes
No
Yes
Yes
Trouble is solved
35
Service Manual