Troubleshooting SiEN12-710A112 Service Diagnosis4.4 Fan Motor or Related Abnormality4.4.1 AC MotorRemote ControlDisplayA6Method ofMalfunctionDetectionThe rotation speed detected by the Hall IC during fan motor operation is used to determineabnormal fan motor operation.MalfunctionDecisionConditionsWhen the detected rotation speed does not reach the demanded rotation speed of the targettap, and is less than 50% of the maximum fan motor rotation speed.SupposedCauses" Operation halt due to short circuit inside the fan motor winding." Operation halt due to breaking of wire inside the fan motor." Operation halt due to breaking of the fan motor lead wires." Operation halt due to faulty capacitor of the fan motor." Detection error due to faulty control PCB.TroubleshootingCheck No.16Refer to P.154NONONOCheck No. 16Check Hall ICNONONOYESYESYESYESYESYES(R7132)CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Replace the fan motor or controlPCB.Replace the fan motor.Replace control PCB.∗ Measure the voltage betweenthe red and black lead wires ofthe fan motor, and check if themaximum voltage reaches therated voltage.Replace the capacitor.(Replace the control PCB.)Replace the fan motor.Replace the fan motor.Replace the control PCB.Does it rotate?Is there an output?Is it at therated voltage? ∗Does it rotatesmoothly?Is it at the ratedvoltage? ∗Is there conductivity?Operate the fan.Rotate the fan by hand.Check the fan motor voltage.Check the fan motor voltage.(immediately after re-start)Check the capacitor's conductivity
