LENNOX SL18XC1 Ice On Coils Blowing Warm
| CONF | DIAGNOSIS | ACTION |
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86%
CONF
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Thermal Expansion Valve (TXV) Kit
The TXV regulates refrigerant flow to maintain proper superheat; if it fails or becomes restricted, the pressure in the evaporator drops significantly. According to the pressure-temperature relationship of R-410A, this pressure drop causes the refrigerant to boil at temperatures below 32°F, freezing the condensate on the coil fins. The resulting ice block acts as a thermal insulator, preventing the system from absorbing heat from the indoor air.
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VIEW ON AMAZON
#CommissionsEarned
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8%
CONF
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High-Efficiency Pleated Air Filter
Airflow is the heat load required to keep the evaporator coil above freezing; if the filter is heavily fouled, the CFM (cubic feet per minute) drops below the required threshold. Insufficient heat exchange allows the evaporator temperature to plummet, causing atmospheric moisture to flash-freeze on the coil. This creates a feedback loop where ice further restricts airflow until the system can no longer cool the air blowing into the home.
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VIEW ON AMAZON
#CommissionsEarned
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6%
CONF
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Indoor Blower Motor
The blower motor provides the mechanical force for air circulation across the evaporator coil. If the motor's windings fail or the capacitor weakens, the resulting lack of convection prevents the refrigerant from absorbing enough heat to remain in a gaseous state at a safe pressure. This leads to a drop in the saturation temperature and subsequent icing of the coil, rendering the air conditioning system incapable of cooling.
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VIEW ON AMAZON
#CommissionsEarned
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DIY Repair Guide
Watch exactly how to replace the Thermal Expansion Valve (TXV) Kit.
// 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.