This procedure is used to verify the electrical integrity of fan motors in wall-mounted indoor units by measuring winding resistance at 20°C.

Check Point 1 – Models AS7–14

Part No.: 9601172017

Read Wire / Resistance Values (±8%)

MeasurementResistance (Ω)
Black – Yellow138
White – Yellow136

Notes:

  • Includes a thermal protector (136°C).

  • If the resistance is open, shorted, or outside the tolerance range, replace the fan motor.

Check Point 2 – Models AS18–24

Part No.: 9601388012

Read Wire / Resistance Values (±8%)

MeasurementResistance (Ω)
Red – White129
Black – Blue21
Blue – Red277

Notes:

  • Equipped with a thermal protector (140°C) for overheat protection.

  • Resistance readings may vary slightly depending on ambient temperature.

Diagnostic Notes

  • Always perform resistance testing at room temperature (20°C).

  • If abnormal readings are detected, first confirm no obstruction or foreign matter is impeding fan rotation.

  • Ensure the thermal protector is operational before declaring a motor fault.

  • Replace the motor if readings fall significantly outside the specified tolerance or the protector is open-circuit.