Carrier 38MBRCQ36AA3 - PC40 Communication Error between the Outdoor Main Chip and Compressor Driven Chip

38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
33
PC 40 (Communication Error Between Outdoor Main PCB and IPM Board Diagnosis and Solution)
Description: The main PCB cannot detect the IPM board.
Recommended parts to prepare:
• Connection wires
•IPM board
• Outdoor main PCB
• Electric control box
Troubleshooting and repair:
?
Is there at least one LED in
the IPM board light?
t
h
e IPM
b
oar
d
,
?
Check the signal wire between
the IPM board and the main
board, is it connected properly?
Reconnect and retry.
Does the error still appear?
Re
pl
ace
.
Is t
h
e
?
Replace IPM board. Is the
system running normally?
Replace the electric control box.
No
No
No
No
Yes
Trouble
is reso
l
ve
d
Trouble is resolved
No
Yes
?
Replace outdoor main board .
Is the system running
normally?
No
Yes
Yes