Lennox 15M44 Rollout Switch

The Lennox 15M44 is a professional-grade flame rollout switch engineered to provide critical safety monitoring in gas-fired residential and commercial heating equipment. Designed as a direct replacement for 626478, this SPST (Single Pole Single Throw) component is calibrated to actuate at 180 degrees F (+/- 8 F), effectively disrupting the burner sequence if it detects a dangerous heat rollout condition. As a manual reset rollout switch, it requires a field technician to physically inspect the heat exchanger and venting for blockages or cracks before restoring furnace operation, ensuring the underlying failure is addressed. This OEM Lennox part, often identified by its distinct pink ID color dot, provides exact fitment and electrical compatibility for a wide range of GCS16 and related furnace models. For contractors maintaining system integrity, the 15M44 serves as a reliable furnace limit safety solution that meets exacting factory specifications.

Key Benefits

• Direct OEM Compatibility: Serves as the factory-authorized replacement for 626478 and older numbers like 81G39 and 44L85.
• Precise Thermal Calibration: Engineered to open at exactly 180 degrees F to prevent cabinet damage or hazardous combustion conditions.
• Manual Reset Safety: Prevents automatic cycling of a compromised system, forcing a manual inspection of the heat exchanger and burner assembly.
• Durable SPST Contacts: Features robust electrical contacts rated for 15 amps, ensuring reliable switching under high-load furnace start-ups.

Common Questions

How do I identify the correct Lennox rollout switch?
The 15M44 can be identified by the pink color-coded dot on the component and its 180°F rating. Always check your furnace’s parts list against the 15M44 or the 626478 cross-reference.

Can I replace a manual reset switch with an auto-reset limit?
No, flame rollout switches like the 15M44 must remain manual reset. This is a critical safety feature that requires a technician to diagnose why flames are rolling out of the burner before the system can run again.

What causes this switch to trip frequently?
Frequent tripping usually indicates a cracked heat exchanger, a soot-clogged flue, or insufficient combustion air. If the Lennox 15M44 opens, a full inspection of the furnace’s combustion path is required.

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.