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Lennox 40L81 flame sensor kit, small metal probe with ceramic base and wire lead

Lennox

Lennox 40L81 Flame Sensor Kit hvac control

SKU CH-DH6W-1VAJN

Flame sensor kit fits Lennox HVAC controls for reliable ignition monitoring

  • Genuine Lennox replacement ensures reliable ignition
  • Kit includes sensor for universal Lennox compatibility
  • New condition guarantees out-of-box performance
  • Direct-fit design simplifies furnace maintenance

Lennox 40L81 Flame Sensor Kit

The Lennox 40L81 Flame Sensor Kit is a replacement part designed for HVAC systems. It fits Lennox branded equipment and supports universal applications. This new component ensures proper flame detection for safe furnace operation.

Critical flame detection component

The kit provides the specific sensor required for the burner assembly to confirm ignition. Without this part the control board cannot verify a flame and will shut the gas valve off. Installers must match the 40L81 part number to the unit's service manual before fitting.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $98.99
Pricier than about 68% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameLENNOX

Questions about this item

How does the 40L81 flame sensor confirm ignition in a Lennox furnace?

The sensor produces a microamp current when flame touches its rod, signalling the control board to keep the gas valve open.

What connection standard does the 40L81 kit use to fit Lennox equipment?

It mounts with the standard screw-in bracket and spade terminals used across compatible Lennox models.

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