Lennox R38492B001 Furnace Flame Sensor

Product Description

The LENNOX R38492B001 is a furnace flame sensor designed to verify burner ignition and maintain safe furnace operation. The flame sensor generates a small microamp signal in the presence of a flame, which the control board reads to confirm combustion. If the signal is absent or too weak, the board initiates a lockout to prevent unburned gas from accumulating. This OEM-style replacement component is installed by licensed HVAC technicians during routine maintenance or when a furnace exhibits nuisance lockouts caused by a degraded or failed sensing rod.

This flame sensor is used in gas-fired residential and light commercial furnaces where a standing pilot or direct spark ignition system requires continuous flame verification during the heating cycle. It is suited for forced-air gas furnace applications where the original sensor has become coated with oxidation buildup or has failed to produce an adequate microamp reading, triggering repeated safety shutdowns.

Key Features

• Provides microamp flame-presence signal to furnace control board for safe operation
• OEM-style replacement designed to restore proper lockout and ignition sequencing
• Used specifically in gas furnace applications requiring continuous flame verification
• Lightweight at 1.5 pounds for easy handling during service calls

Compatibility

Designed as an OEM-style replacement flame sensor for residential and light commercial gas furnaces.

Installation Notes

A licensed HVAC technician should install this component. Shut off all electrical power and close the gas supply valve before beginning any service work. The sensing rod should be positioned correctly within the burner flame envelope per the furnace manufacturer's installation documentation. After installation, verify the microamp signal reading at the control board using a multimeter rated for microamp measurement to confirm proper flame detection.

Technical Specifications

• Type: Flame Sensor
• Used On: Furnace
• Weight: 1.5 pounds

Standard Information

• Brand: LENNOX
• Manufacturer Part Number: R38492B001