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Carrier 38MGQ Series Service Manual page 36

Multi-zone ductless split system
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Zero crossing detection error diagnosis and solution (E2)
Error Code
Malfunction decision conditions
Supposed Causes
Troubleshooting:
E2
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero
crossing signal interval is abnormal
S
Connection mistake
S
PCB faulty
36
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