40MBDAQ: Service Manual
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DIAGNOSIS AND SOLUTION (CONT.)
F0/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 th e u nit after 2 minutes.
Does the error still exist?
Replace the wired controller.
Does a problem remain? The unit is operating normally. NO
Check the wiring and connections.
YES
Are all the
connections good?
Ensure proper connections.NO
YES
Replace the indoor main PCB.
The problem is solved.NO
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