Could a failing Thermostatic Expansion Valve (TXV) Kit cause the RHEEM RA14 to have symptom: Ice On Coils Blowing Warm?

The TXV regulates the flow of liquid refrigerant into the evaporator coil. If the internal diaphragm or sensing bulb loses its charge, or if the internal needle is stuck in a restricted position, the resulting low suction pressure causes the coil temperature to drop below 32°F, leading to immediate frost accumulation and eventual total icing of the coil block.

What is the most likely root cause for a RHEEM RA14 with symptom: Ice On Coils Blowing Warm?

The TXV regulates the flow of liquid refrigerant into the evaporator coil. If the internal diaphragm or sensing bulb loses its charge, or if the internal needle is stuck in a restricted position, the resulting low suction pressure causes the coil temperature to drop below 32°F, leading to immediate frost accumulation and eventual total icing of the coil block.

RHEEM RA14 Ice On Coils Blowing Warm

CONF	DIAGNOSIS	ACTION
88% CONF	Thermostatic Expansion Valve (TXV) Kit The TXV regulates the flow of liquid refrigerant into the evaporator coil. If the internal diaphragm or sensing bulb loses its charge, or if the internal needle is stuck in a restricted position, the resulting low suction pressure causes the coil temperature to drop below 32°F, leading to immediate frost accumulation and eventual total icing of the coil block.	VIEW ON AMAZON #CommissionsEarned
12% CONF	Secondary Circuit / Wiring Check Inspect wiring harness.	VIEW ON AMAZON #CommissionsEarned

// ENGINEER'S LOG

The forensic analysis of the RA14 system identifies a localized pressure-temperature drop within the evaporator circuit. The transition from gaseous cooling to solid-phase icing suggests the refrigerant is reaching its boiling point at a pressure significantly lower than the design specification (approx. 118 PSI for R-410A). This is characteristic of a metering restriction. The ice serves as a physical barrier to the heat exchange process; as the thermal resistance of the ice layer increases, the system's ability to extract enthalpy from the indoor air reaches zero, resulting in ambient-temperature air being circulated by the blower despite the compressor's continued operation.

DIY Repair Guide

Watch exactly how to replace the Thermostatic 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.

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RHEEM RA14 Ice On Coils Blowing Warm

DIY Repair Guide