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" mineral buildup on the discharge port
Common indicators include fluctuating water temperatures
Look for visible cracks on the ignitor element or carbon buildup on the sensor rod
This compensates for the narrowing of setpoints at lower pressures
Common Questions Is the 015-04177-004 compatible with R407C
Lennox 15W12 Expansion Valve 322838-754 " mineral buildup on theThe Lennox 15W12 Indoor Expansion Valve is a critical OEM component engineered for high precision refrigerant metering in residential and light commercial R410A HVAC systems. As a thermal expansion valve (TXV), it utilizes a 1 2 inch outlet and 3 8 inch inlet connection to maintain the precise superheat required for optimal evaporator performance. This replacement expansion valve is designed to replace part number 100254 06, directly addressing issues