This single-pole

When diagnosing intermittent "no heat" calls or limit circuit lockouts (often indicated by a 4-flash LED code on many ICP boards)

Safety Restoration: Resolves furnace ignition failure and frequent short-cycling caused by degraded sensor lines

the brass construction and soft metal seat are specifically designed to handle the rigors of steam boiler applications and industrial liquid storage

Key Benefits Precision Resistance: Matches 1000 ohm nickel element specifications with tight 1% tolerance for improved system setpoint accuracy

Lennox 27H87 Limit Switch This single-poleThe Lennox 27H87 Limit Switch is a critical OEM safety component engineered for precise thermal management in high performance heating systems. This 120 160F auto limit switch is specifically designed to monitor furnace plenum temperatures, providing a fail safe against overheating by interrupting the burner circuit if thresholds exceed the factory calibrated 160F limit. As a veteran grade HVAC replacement part, the 27H87 ensures seamless integration