LENNOX XC21 Not Spinning
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
85%
CONF
|
Dual Run Capacitor
The capacitor stores energy to provide the necessary torque to start and maintain the rotation of the fan motor. In high-efficiency units like the XC21, capacitors are subject to high thermal stress which causes the internal dielectric fluid to dissipate, leaving the motor without the phase-shifted current required to initiate rotation.
|
|
|
10%
CONF
|
Condenser Fan Motor
If the motor windings have suffered an internal short or the permanent-split capacitor (PSC) leads have failed, the motor will fail to convert electrical energy into mechanical rotation. Additionally, seized sleeve or ball bearings caused by environmental contamination will physically prevent the fan blades from spinning regardless of power delivery.
SKU: 100483-21
|
|
|
5%
CONF
|
AC Contactor, 2-Pole
The contactor acts as the gatekeeper for 240V power to the outdoor unit. If the silver-plated contacts are pitted or 'charred' from repeated arcing, they can create a high-resistance path that prevents enough current from reaching the fan motor to overcome its initial inertia.
|
DIY Repair Guide
Watch exactly how to replace the Dual Run Capacitor.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.