Ultra Durable 52W29 Furnace Flame Sensor

Ultra Durable 52W29 Furnace Flame Sensor

Key Features

• Monitors the burner to detect a flame for safe furnace operation.
• Signals the gas valve to shut off if a flame is not detected, preventing gas buildup.
• Constructed with high-quality materials for reliability and long service life.
• Straight probe design ensures direct flame exposure for accurate sensing.
• Engineered as a direct-fit replacement for specified OEM parts.

Replaces / Cross-Reference Part Numbers

• 31L71
• 31L7101
• 52W29
• 52W2901
• 102431-01
• L68
• LB-47940A
• LB-74940A

Compatibility & Fitment

• Designed for use with select furnace models from the following brands:
• Lennox
• Armstrong
• Ducane

When to Replace

• Furnace ignites but shuts down after a few seconds.
• Furnace control board indicates a flame sensor error via a fault code.
• The existing sensor's probe is cracked, corroded, or coated with heavy carbon deposits.
• The ceramic insulator is cracked or broken.

Installation Tips

• Disconnect all electrical power to the furnace before servicing.
• Locate the flame sensor, typically held by a single screw in the path of the burner flame.
• Avoid touching the metal rod with bare hands; skin oils can contaminate the surface and impair function.
• Ensure the new sensor is securely mounted and the wire is firmly connected.
• After installation, restore power and verify proper furnace operation through a complete heating cycle.