This procedure outlines how to verify the condition of the indoor fan motor for various ducted models by measuring coil resistance at 20°C. Each fan motor includes multiple speed windings (Low, Medium, High) and an internal thermal protector (140°C).
Check Point 1 – Models AR7, AR9
Part No.: 9601722014
Read Wire / Resistance Values (±8%)
| Measurement | Expected Resistance (Ω) |
|---|---|
| White – Red | 764.3 |
| Red – Black | 136.5 |
| Red – Violet | 68.2 |
| Violet – Blue | 68.2 |
Check Point 2 – Models AR12, AR14
Part No.: 9601723011
Read Wire / Resistance Values (±8%)
| Measurement | Expected Resistance (Ω) |
|---|---|
| White – Red | 597.2 |
| Red – Black | 192.7 |
| Red – Violet | 90.7 |
| Violet – Blue | 90.7 |
Check Point 3 – Models AR18, AR22
Part No.: 9601723028
Read Wire / Resistance Values (±8%)
| Measurement | Expected Resistance (Ω) |
|---|---|
| White – Red | 210.2 |
| Red – Black | 176.7 |
| Red – Violet | 28.7 |
| Violet – Blue | 28.7 |
Diagnostic Notes
All resistance values are measured at 20°C ambient temperature.
If resistance is open, shorted, or deviates significantly from specification, replace the indoor fan motor.
Ensure the thermal protector (140°C) is not open-circuited before concluding motor failure.
Confirm no mechanical obstruction in the blower or bearings prior to electrical replacement.
