RUUD UA20 Ice On Coils Blowing Warm
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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86%
CONF
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Thermostatic Expansion Valve (TXV)
The TXV is the mechanical metering device that regulates refrigerant flow into the evaporator. If the internal diaphragm or sensing bulb fails, the valve may stick in a restricted position, causing a significant drop in suction pressure; this lowers the boiling point of the refrigerant below freezing, turning atmospheric moisture into ice on the coil fins.
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VIEW ON AMAZON
#CommissionsEarned
|
|
8%
CONF
|
ECM Blower Motor
The variable-speed ECM blower must maintain specific CFM (Cubic Feet per Minute) to ensure proper heat transfer. If the motor's control module fails or the bearings increase mechanical drag, the reduced airflow prevents the refrigerant from absorbing enough heat from the home's air, causing the coil temperature to plummet and freeze.
SKU: 51-101774-01
|
VIEW ON AMAZON
#CommissionsEarned
|
|
6%
CONF
|
HVAC Air Filter (High MERV)
While a consumable, a heavily fouled filter is a common mechanical cause of air starvation. The increased static pressure prevents sufficient warm return air from reaching the evaporator coils, leading to a lack of thermal load which causes the refrigerant to stay below the dew point and freezing point.
|
VIEW ON AMAZON
#CommissionsEarned
|
DIY Repair Guide
Watch exactly how to replace the Thermostatic Expansion Valve (TXV).
// 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.