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Lennox 49M84 Flame Sensor

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Special Price $17.49 Regular Price $22.73
In stock
SKU
49M84
The Lennox 49M84 Flame Sensor is a crucial safety component in Lennox gas-fired HVAC systems. It safeguards against gas leaks by detecting the presence of a flame within the burner assembly. When the furnace ignites, the sensor rod heats up to temperatures between 1200°F and 1800°F. This signals the control board that combustion is happening properly. If the flame sensor doesn't detect a flame or the temperature falls outside the expected range, the control board shuts down the gas supply to prevent a dangerous gas leak. The sensor is a small rod, typically measuring 3 to 5 inches long and 1/16 to 1/8 inches thick.
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HVAC Furnace Parts, Flame Sensor
Manufacturer:
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Specifications

  • Weight:0.03lbs
  • Temperature: 1200°F to 1800°F
  • Size:3 Inch to 5 Inch
  • Thickness: 1/16 Inch to 1/8 Inch
Manufacturer Name: Lennox
Product Number: 49M84
OEM Part Number: 49M84
Product Description: Flame Sensor
Weight:0.03lbs/13.61g

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Product Questions (2)
Customer Questions
What maintenance is required for the Lennox 49M84 Flame Sensor?

Flame sensors should be inspected and gently cleaned to remove oxidation and carbon buildup using a fine abrasive pad. This ensures accurate flame detection and accurate ignition performance. Regular maintenance assists in preventing furnace lockouts and improves operational safety.

What are common issues with the Lennox 49M84 Flame Sensor?

  • Weak flame signal due to oxidation or soot buildup.
  • Furnace fails to ignite or repeatedly shuts off during operation.
  • Intermittent lockouts caused by poor flame recognition.
  • Corroded or loose electrical connections affecting signal transmission

Installation Steps

Step 1: Turn off power and gas supply, confirm the unit is off.

Step 2: Open the access panel and place the flame sensor near the burner assembly.

Step 3: Disconnect the sensor wire carefully.

Step 4: Remove the mounting screw and take out the old sensor.

Step 5: Place the new sensor in position and secure it firmly.

Step 6: Reconnect the wire, close the panel, restore power and gas, and check proper flame detection.