Carrier DHMVHA Service Manual page 25

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DIAGNOSIS AND SOLUTION (CONT.)
Indoor PCB/Display Board Communication Error ( )
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
The indoor PCB does not receive feedback from the display board.
Communication wire
Indoor PCB
Display board
Power off. Wait 2 minutes
then restart the unit.
Is it still displaying the error code?
YES
Check the wirings and connections.
Are all the connections
good?
YES
Replace the indoor main PCB.
Does the error still exist?
Replace the display board.
NO
The unit is functioning normally.
NO Ensure a proper connection.
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