Century COMFORT-AIRE VMH-SG Series Service Manual page 90

TS03: Zero crossing detection error diagnosis and solution
Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time
interval is abnormal.
Recommended parts to prepare:
• Connection wires
• Indoor main PCB
Troubleshooting and repair:
Check the connections and
Indoor main PCB is defective. Replace
Note: Zero crossing detection error is only valid for the unit with AC fan motor, for other models, this error is
invalid.
power supply.
Is it normal? NO
YES
indoor main PCB.
 Troubleshooting
Troubleshooting
Correct the connections. Turn on the
unit when the power supply is good.

Service Manual - VMHxxSG