# How to Replace the Thermal Sensor on a Lennox Furnace
Because your Lennox furnace runs on gas, it is important that safeguards are working properly. One such safeguard is the thermal sensor. This component sits next to the pilot light in the furnace and senses whether the pilot light is on. If you turn on the furnace and the sensor doesn't detect the pilot light, it shuts the gas valves off. That's why it's important to address any sensor issues immediately.
Things You'll Need
- Phillips screwdriver
Instructions
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1
Shut off the power supply to your Lennox furnace. You can do this via the main control panel on the furnace, or by flipping the furnace circuit breaker to the "Off" position.
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2
Remove any screws on the front access panel of the furnace. Remove the access panel. Notice the pilot light assembly in the furnace. Mounted to it will be the thermal sensor, a long metal rod.
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3
Unplug the wiring at the base of the thermal sensor.
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4
Remove the mounting screw holding the sensor in place and remove the sensor.
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5
Fit a new sensor in the furnace and replace the screw. Plug in the wiring.
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6
Replace the front panel of the furnace as well as the panel screws.
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1
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