GREE U-Match 6 SERIES UNIT SERVICE MANUAL
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Troubleshooting:
3.4.14 “HC” PFC Protection
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display HC
Error judgment condition and method:
After power is connected, and drive chip received PFC lead F0 that is of low level, than it is PFC
module malfunction. System will shut down for protection.
Possible reason:
■Power grid voltage is abnormal.
■Drive board PFC module is damaged.
■Drive board PFC module’s 15V power supply is lower than 13.5V.
■Drive board PWM signal for PFC and the corresponding element are abnormal.
■Drive board PFC current sampling circuit element is damaged or drive chip current sampling AD
terminal is abnormal.
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