LENNOX SIGNATURE SERIES XC21 Ice On Coils Blowing Warm
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
96%
CONF
|
Healthy Climate PureAir Filter (X6675)
A clogged or high-static air filter restricts the volume of warm return air passing over the evaporator coil. Without sufficient heat load, the refrigerant fails to boil off completely at the designed pressure, leading to sub-freezing coil temperatures and rapid ice accumulation. Replacing the filter restores the required CFM (cubic feet per minute) to maintain the coil above freezing.
SKU: X6675
|
VIEW ON AMAZON
#CommissionsEarned
|
|
2%
CONF
|
OEM Evaporator Coil
Micro-fractures at the copper-to-aluminum transition points or along the tube sheet can cause a slow refrigerant leak. Low system pressure results in a lower saturation temperature (Joule-Thomson effect), causing the coil to operate below 32°F. This creates localized icing that eventually spreads to encapsulate the entire coil, blocking heat transfer.
|
VIEW ON AMAZON
#CommissionsEarned
|
|
2%
CONF
|
ECM Blower Motor
The XC21 relies on a variable-speed ECM motor to maintain airflow; if the motor or its control module fails, airflow stops entirely. Without forced convection to transfer heat from the home's air to the refrigerant, the evaporator coil temperature plunges, freezing all condensate on the surface into a solid block.
SKU: 103916-03
|
VIEW ON AMAZON
#CommissionsEarned
|
DIY Repair Guide
Watch exactly how to replace the Healthy Climate PureAir Filter (X6675).
// 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.