Ensure the safety and reliability of your HVAC system with our HH18HA452 Flame Rollout Limit Switch. Engineered to meet or exceed OEM specifications, this critical safety component monitors furnace temperature and responds instantly to dangerous conditions such as flame rollout, heat exchanger failure, or restricted ventilation.

When internal temperatures exceed 250°F (121°C), the switch automatically opens the circuit, cutting power to the gas valve or ignition system to prevent overheating and potential fire risks. The manual reset feature requires intentional reactivation after cooling, adding an extra layer of safety and diagnostic capability.

Built from premium materials including heat-resistant metal and durable thermal bimetal, this switch is designed to withstand the high-temperature, high-vibration environment inside a gas furnace. Its compact, surface-mount design and standard screw terminals make installation straightforward for qualified technicians or experienced DIYers.

Technical Specifications:

Activation Temperature: 250°F (121°C)
Contact Type: Normally Closed, Manual Reset
Terminal Type: Screw Connectors
Mounting Orientation: Front Side Up
Compatibility: Carrier, Bryant, Payne residential gas furnaces
Replaces OEM Parts: 4349806, HH18HA252, 95-320156, L250F

Installation Notes: Always turn off electrical power and gas supply before replacing any furnace component. Refer to your furnace's wiring diagram for proper connection. This part is intended for use in gas-fired forced-air furnaces and should be installed by a qualified technician if you are unsure of the procedure.