Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
32
DIAGNOSIS AND SOLUTION (CONT.)
EH b3 (Communication error between wired controller and indoor unit Diagnosis and Solution)
Description: If the indoor PCB does not receive feedback from the wired controller, the error displays on the wired controller.
Recommended parts to prepare:
• Connection wires
• Indoor PCB
• Wired controller
Troubleshooting
YES
Power o, then restart the unit after 2 minutes.
.
Does the error
still exist?
Replace the wired controller.
Does a problem remain?
NO
Check the wirings and connections.
YES
Are all the
connections good?
Ensure proper connections.
NO
YES
The problem is solved.
NO
The unit is operating normally.
Replace the indoor main PCB.

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English