LENNOX SL18XC1 Loud Buzzing Wont Turn On
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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93%
CONF
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Dual Run Capacitor
The capacitor stores energy to provide the phase-shifted 'start' winding current required for the compressor and fan. A failure in the dielectric prevents the motor from generating starting torque, resulting in a stationary rotor and a loud 60Hz hum from the stator windings. Replacing this restored the electrical phase differential needed for rotation.
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VIEW ON AMAZON
#CommissionsEarned
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4%
CONF
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Electromechanical Contactor
The contactor acts as the high-voltage switch for the condenser. If the internal electromagnetic coil experiences a partial short or the silver contacts become pitted, the armature may vibrate rapidly (chatter) against the poles rather than maintaining a solid connection. This produces a loud buzzing sound and prevents consistent power delivery to the compressor.
SKU: 10F73
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VIEW ON AMAZON
#CommissionsEarned
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3%
CONF
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Condenser Fan Motor
If the capacitor is functional but the motor bearings have seized or the internal windings have shorted, the motor will buzz as it attempts to turn. This mechanical resistance prevents the cooling cycle from initiating and can lead to a thermal overload trip, preventing the unit from turning on.
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#CommissionsEarned
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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.