Lennox 10P28 Thermocouple

The Lennox 10P28 Thermocouple is a high-performance pilot flame sensor engineered for standing pilot systems in gas-fired furnaces, boilers, and water heaters. As an OEM HVAC replacement part, this 30 mV thermocouple generates the necessary thermal electromotive force to signal the gas valve's power unit, ensuring the pilot light safety circuit remains energized during operation. Featuring a 36-inch lead and a standard 11/32-32 male nut connector, the 10P28 offers broad furnace thermocouple compatibility across Lennox G20, G8, and GS series units, as well as various Honeywell Q340A series applications. This component is built to withstand high-heat combustion environments, providing a reliable millivolt signal to prevent unburned gas discharge. For technicians performing maintenance, the 10P28 serves as a direct 30mV thermocouple replacement for legacy Lennox part numbers including 68A48, 78B71, and 67Z64. Its robust construction ensures long-term flame sensing accuracy, making it a staple for professional service trucks restoring ignition safety in residential and light commercial equipment.

• Precise 30 mV Output: Consistently generates the voltage required to hold the gas valve open, reducing nuisance shutdowns.
• Extended 36-Inch Reach: Provides ample thermocouple lead length for flexible routing and easy installation in tight pilot burner assemblies.
• Broad Cross-Reference: Replaces multiple obsolete Lennox furnace parts, streamlining inventory for service contractors.
• High-Temperature Durability: Engineered with corrosion-resistant metals to maintain signal integrity within the combustion chamber.
• Universal Mounting Options: Includes adapter fittings to support push-in clip, split nut, or adapter assembly installation styles.

What is the mV rating for the Lennox 10P28?
This is a standard 30 mV thermocouple designed for most millivolt gas control systems and standing pilot assemblies.

Is the 10P28 compatible with other brands?
Yes, while it is a genuine Lennox OEM part, it features universal 11/32" connectors and is frequently used as a Honeywell Q340A series equivalent in various gas appliances.

How do I know if this thermocouple has failed?
If your pilot light stays lit while holding the button but goes out immediately after releasing it, the thermocouple likely failed to produce the required millivolt signal to the gas valve.

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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.