Lennox 49L88 Limit Switch

For service technicians and contractors maintaining residential heating systems, the Lennox 49L88 Limit Switch is a critical OEM safety component designed for the high-limit protection of your heat exchanger. This L185-30F limit control is engineered with a normally closed SPDT contact configuration, set to open on temperature rise at 185°F and automatically reset at 155°F. This specific 30-degree differential prevents rapid cycling while ensuring the furnace operates within safe thermal parameters. As a direct 49L8801 replacement part, it offers exact physical and electrical compatibility with Lennox G40, G43, and G50 series furnaces. With a 3-inch insertion length, this bimetal furnace limit switch provides precise thermal sensing in the plenum, protecting against airflow restrictions or blower motor failure. Trust this genuine Lennox HVAC part to restore system safety and meet manufacturer specifications on every service call.

• OEM Compatibility: Precision-milled for a drop-in fit, replacing both 49L88 and 49L8801 part numbers without field modification.
• Automatic Reset Logic: Features a fixed 155-185°F temperature range that eliminates the need for manual intervention after a temporary overheat condition.
• Superior Construction: Built with robust bimetal sensing technology and SPDT contacts for reliable switching under high-duty cycle residential heating loads.
• Safety Compliance: Acts as a primary furnace high limit control, effectively preventing heat exchanger damage and potential fire hazards.

Is the 49L88 a direct replacement for the 49L8801?
Yes, these part numbers are identical. The 49L88 is the current OEM designation for the legacy 49L8801 limit switch.

What are the exact trip and reset points for this switch?
This is an L185-30F switch, meaning it opens the circuit (Cut-Out) at 185°F and automatically closes (Cut-In) at 155°F after the plenum cools.

Does this switch work on Allied or Armstrong equipment?
Yes, as a genuine Lennox part, it is a certified cross-reference replacement for Allied Air, Armstrong, Concord, and Ducane systems using the same specifications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.