Panasonic CS-RE9SKUA Service Manual

Also see for CS-RE12SKUA: Installation manual Operating instructions

9617.4.23 F90 (Power Factor Correction Protection)Malfunction Decision Conditions To maintain DC voltage level supply to power transistor. To detect high DC voltage level after rectification.Malfunction Caused During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry atthe outdoor unit main PCB senses abnormal DC voltage level for power transistors. When DC voltage detected is LOW, transistor switching will turn ON by controller to push-up the DC level. When DC voltage detected is HIGH (391Vdc – 425Vdc), active LOW signal will send by the controller to turn OFFrelay RY-C.TroubleshootingWhen abnormality indication starts again.Reset the error code and turn on the unit again.Is AC power supply normal fluctuation?Verify PFC abnormality by measuring DC voltage betweenDCP(+) and DCN(-) at the capacitor PCB.Is the DC voltage between DCP(+) and DCN(-) normal?Check the reactor impedance.Is the impedence of the reactor low?Is the DC voltage between CN-FM1 and 4 of the outdoor fanmotor normal?Are the compressor’s winding resistance (U-V, V-W, U-W)uniform?Confirm the DC voltage between CN-FM 1 and 4 whencompressor is running. Normal voltage range should bebetween 265-325Vdc.NOYESYESYESNO (391.2Vdc ~ 425Vdc)● AC power supply abnormal surge.YES (~280Vdc) ● Defect in PFC circuitry.● Replace the outdoor unit PCB.NO ● Defect in outdoor fan motor.● Replace outdoor fan motor.NO ● Defect in compressor.● Replace compressor.● Defect in reactor.● Replace reactor.For safety reason and to preventcomponent breakdown, alwaysswitch off the power before removeand connect the component.Check the compressor winding resistance:● Turn off the power and disconnect the harnesses U, V,and W.● Measure the winding resistance between U-V, V-W, andW-U.