Carrier 40MAQB12B--3 - Zero Crossing Detection Error Diagnosis (E2); E2 Error Diagnosis and Solution

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Zero crossing detection error diagnosis and solution (E2)
Error Code E2
Malfunction decision conditions
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero
crossing signal interval is abnormal
Supposed Causes
S Connection mistake
S PCB faulty
Troubleshooting: