A Lochinvar 100074281 Output Thermistor monitors temperature at the heat exchanger to support accurate response across the unit.
The output thermistor measures outlet temperature at the heat exchanger and sends accurate readings to the control system so the HVAC system can regulate operation correctly. Its temperature-sensitive construction matters because consistent sensor response supports efficient performance, proper safety logic and dependable system control.
The output thermistor might need to be replaced if the HVAC system shows erratic temperature readings, inconsistent cycling, lockouts or poor heating performance. Physical signs can include damaged wiring or sensor wear and environmental signs may include moisture exposure, corrosion or residue buildup around the sensing area.
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