Carrier 40MBFAQ Service Manual page 31

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH 0b (Communication error between display board and main board Diagnosis and Solution)
Description: The indoor PCB does not receive feedback from the display board
Recommended parts to prepare:
• Communication wire
• Indoor PCB
• Display board
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Power off, then restart the unit
2 minutes later.
Is it still displaying
the error code?
YES
Check the wirings and connections.
Are all the connections
NO
good?
YES
Replace the indoor main PCB.
Does the error still exist?
Replace the display board.
NO The unit functions normally.
Ensure a proper connection.
31