INITIALIZING SWARM...

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LENNOX XC21 Wont Ignite

CONF DIAGNOSIS ACTION
95%
CONF
Dual Run Capacitor
The dual run capacitor is responsible for creating the electrical phase shift necessary to initiate rotation in the compressor and fan motors. When the capacitor fails, the motors cannot overcome inertia or refrigerant head pressure, leading to an 'inductive hum' while the components remain stationary. Replacing this component restores the starting torque and protects the motor windings from thermal damage.
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5%
CONF
Secondary Circuit / Wiring Check
Inspect wiring harness.
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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.

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