Carrier 42QHC009D8S Series Service Manual

43
18.3.3.2 Communication malfunction between IPM board and outdoor main board(ODU E3)
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 board and the main
board, is it connected good?
Reconnect and retry. Is
error still display?
Replace IPM board, and
then check whether the
system can run normally
Replace the electric control
box
No
No
No
No
Yes
Trouble is solved
No
Yes
Replace outdoor main
board, and then check
whether the system can run
normally
No
Yes
Yes
E3 display

Carrier 42QHC009D8S Series Specifications

General

Brand	Carrier
Model	42QHC009D8S Series
Category	Air Conditioner
Language	English