Lennox 57W76 185°F Manual Reset SPST Rollout Switch

Description

The Lennox 57W76 is a manual reset, single-pole single-throw (SPST) rollout switch engineered to protect gas furnaces from the hazards of flame rollout. Designed as a direct OEM replacement for compatible Lennox heating systems, this safety switch delivers reliable, accurate thermal protection to keep equipment and occupants safe.

How It Works

The rollout switch monitors burner compartment temperatures and opens the circuit when heat is detected outside the normal combustion area — a condition known as flame rollout. Once tripped, the switch must be manually reset, ensuring a technician inspects and resolves the root cause before the system is returned to service. This manual reset requirement is a critical safety feature that prevents the furnace from cycling back on after a potentially dangerous fault.

Key Features

• Trip temperature: 185°F — opens circuit on detection of abnormal heat
• Manual reset operation — requires intentional technician reset after trip event
• SPST (Single-Pole Single-Throw) configuration for straightforward circuit interruption
• OEM Lennox replacement part — engineered for precise fit and function
• Protects heat exchanger, burners, and surrounding components from flame rollout damage
• Compact design for easy installation in tight burner compartment spaces

Application

The 57W76 is intended for use in Lennox gas furnaces as a direct OEM replacement rollout switch. Always consult your equipment’s service manual or parts list to confirm compatibility before installation. Flame rollout switches should be inspected and replaced by a qualified HVAC technician.

Why Rollout Switches Matter

Flame rollout is a serious furnace fault that can result in heat exchanger damage, carbon monoxide hazards, and fire risk. A properly functioning rollout switch is your furnace’s last line of defense against these conditions. Replacing a faulty or tripped rollout switch with a genuine OEM part like the Lennox 57W76 ensures your system’s safety controls perform as originally designed.