Troubleshooting
3. Indoor AC Motor
1) Power off and disconnect fan motor power cord from PCB. Measure the resistance value of each winding by using
the multi-meter. The normal value show as follows .
Model
YKFG-13-4-38L
YKFG-13-4-38L-4
YKFG-15-4-28-1 YKFG-20-4-10L YKFG-20-4-5-11
Brand Welling Welling Welling Welling
Black – Red Main 345Ω 75Ω 269Ω 388Ω
Blue – Black AUX 348Ω 150Ω 224Ω 360Ω
Model YKFG-20-4-5-19 YKFG-25-4-6-14
YKFG-28-4-3-7
YKFG-28-4-3-14
YKFG-28-4-6-5
Brand Welling Welling Welling Welling
Black – Red Main 444Ω 287Ω 231Ω 183.6Ω
Blue – Black AUX 470Ω 409Ω 414Ω 206Ω
Model YKFG-45-4-13
YKFG-45-4-22
YKFG-45-4-22-13
YKFG-60-4-2-6 YKFG-60-4-1
Brand Dongfang Welling Welling Welling
Black – Red Main 125.2Ω 168Ω 96Ω 68Ω
Blue – Black AUX 83.8Ω 141Ω 96Ω 53Ω
2) Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage
of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V (115V power supply),
the PCB must has problems and need to be replaced.
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