Carrier 40MPHA Service Manual page 38

Eb (Communication error between the Indoor PCB and Display Board)
Description: Indoor PCB does not receive feedback from the display board.
Recommended parts to prepare:
• Wiring mistake
• PCB faulty
• Display board malfunction
Troubleshooting and Repair:
Power off. Wait 2 minutes
then restart.
Is it still displaying
the error code ?
Check the wirings and
connection.
Is it normal ?
Replace the indoor main PCB.
Is the problem solved?
The unit operates normally.
38
YES
YES
YES
Specifications subject to change without notice.
NO The unit operates normally.
Correct the connection
NO
or replace the wirings.
NO Replace the display board.
40MPHA-03SM