White Rodgers 1E78-140 Thermostat A faulty limit switch often

A faulty limit switch often results in the furnace blower running constantly or the burners shutting down prematurely (short cycling)

Why did my original blower relay melt

typically allowing for a local offset of +/- 2 or 3 degrees

As long as the capacitance and voltage match and you have space in the mounting strap

Maintaining a calibrated thermistor resistance is vital for the defrost logic and refrigerant flow regulation

White Rodgers 1E78-140 Thermostat A faulty limit switch oftenThe White Rodgers 1E78 140 Thermostat provides a rugged, field proven solution for single stage heat only systems. Operating on 24V low voltage or millivolt systems, this vertical non programmable unit is the preferred choice for technicians replacing older mechanical mercury thermostats in residential or light commercial applications. Its digital LCD backlit display offers high contrast visibility, ensuring accurate temperature readings within a 1