AIRSTAGE Technical Reference
Indoor Fan Motor Resistance Testing
AR7, AR9, AR12, AR14, AR18 and AR22 ducted models
Use this procedure to verify the electrical condition of the indoor fan motor by measuring winding resistance at 20°C.
Each fan motor incorporates multiple speed windings for Low, Medium and High fan operation together with an internal 140°C thermal protector. Resistance values are specified with a tolerance of ±8%.
Electrical safety: Isolate power to the indoor unit before disconnecting the fan motor or carrying out resistance measurements. Confirm the circuit is de-energised before testing.
1. Models AR7 and AR9
Indoor fan motor part number: 9601722014
Resistance values at 20°C - tolerance ±8%
| Measurement | Expected Resistance (Ω) |
|---|---|
| White - Red | 764.3 |
| Red - Black | 136.5 |
| Red - Violet | 68.2 |
| Violet - Blue | 68.2 |
2. Models AR12 and AR14
Indoor fan motor part number: 9601723011
Resistance values at 20°C - tolerance ±8%
| Measurement | Expected Resistance (Ω) |
|---|---|
| White - Red | 597.2 |
| Red - Black | 192.7 |
| Red - Violet | 90.7 |
| Violet - Blue | 90.7 |
3. Models AR18 and AR22
Indoor fan motor part number: 9601723028
Resistance values at 20°C - tolerance ±8%
| Measurement | Expected Resistance (Ω) |
|---|---|
| White - Red | 210.2 |
| Red - Black | 176.7 |
| Red - Violet | 28.7 |
| Violet - Blue | 28.7 |
4. Diagnostic Notes
- All resistance values are specified at 20°C ambient temperature.
- If resistance is open, shorted, or deviates significantly from specification, replace the indoor fan motor.
- Confirm the internal 140°C thermal protector is not open-circuited before concluding that the motor has failed.
- Check for any mechanical obstruction in the blower assembly or bearings before replacing the motor electrically.
Recommended test sequence: Confirm the correct motor part number for the model, isolate power, disconnect the motor, measure each specified wire pair, compare the readings with the relevant table, then verify the thermal protector and mechanical condition before replacement.
Resistance values and replacement criteria are based on the supplied service information. Confirm model and motor part number applicability before replacing components.