7975-3281 Coleman OEM F110-20 FAN Switch, 90-110F AUTO Limit Switch

S1-7975-3281 Coleman OEM F110-20 FAN Switch, 90-110F AUTO Limit Switch

F110-20 FAN Switch, 90-110F AUTO Limit Switch

313675, Size 60T82, Manufacture # 21157, A1831

Replaces 7700-328, 7700-3281, S1-7975-3281, S1-7956-3351, 7660-3281, 7995-3351

1 year warranty on everything we sell 

Enhance your furnace’s reliability and safety with the genuine Coleman S1-7975-3281 F110-20F fan limit switch. This automatic switch senses plenum temperature and cycles the blower on at 90 °F and off at 110 °F, protecting heat exchangers from overheating and ensuring optimal airflow. Engineered for direct fit in standard 60T11 limit housings, its rugged metal case and precision bimetal element deliver long-lasting performance in residential, mobile-home, and light-commercial furnaces.

Cross Reference

Data sourced from HVACpartstore and Coleman OEM cross listings

Technician Notes

• Always disconnect power at the service panel before servicing the furnace.

• Access the F110-20F switch through the blower compartment; remove mounting screws and gently extract the old unit from its 60T11 housing.

• Test continuity across the two fan terminals at room temperature (closed) and above 110 °F (open) using a multimeter.

• Install the new switch fully into the housing, ensuring the bimetal element faces into the plenum and terminals are snug.

• After reassembly, run multiple heat cycles to confirm blower-on and blower-off temperatures align with switch ratings.

Compatibility