Reznor 101889 Pilot Light and 1C26 series thermostats with

and 1C26 series thermostats with a solid base for maximum stability

If the coil is heavily frosted/iced (below 38°F) and you read infinite resistance (OL)

Replacing a cracked or clogged nozzle restores the unit's ability to reach its rated output

this Type 3 restrictor features an integrated air filter to prevent orifice fouling—a common point of failure in systems with aging compressors

the limit switch has failed and must be replaced

Reznor 101889 Pilot Light and 1C26 series thermostats withFor service technicians and commercial mechanical contractors, the Reznor 101889 Pilot Light is the essential OEM replacement indicator for maintainance and troubleshooting of Reznor unit heaters. This 28V pilot light is engineered for high visibility signaling in industrial control panels, featuring a red lens that provides a clear visual status of the HVAC burner sequence or alarm circuits. Operating at 1. 2 Watts, this component ensures minimal