This single-pole

ensuring zero-clearance fitment and correct terminal orientation

appliances

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

ensuring safe gas burner operation and long-term durability in high-heat environments

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