Carrier 40MAHB Series Service Manual page 19

40MAHB: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Zero Crossing Detection Error Diagnosis and Solution (EH02)
Description: When the PCB does not receive a zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal.
Recommended parts to repair:
• Connection wires
• Indoor main PCB
Troubleshooting
Indoor main PCB is defective.
Replace the indoor main PCB.
Note: Zero crossing detection error is only valid for the unit with an AC fan motor. For other models, this error does not apply.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Check the connections and
power supply.
Is it normal?
YES
Correct the connections. Turn on the
NO
unit when the power supply is on.
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