Before searching for the flame sensor for removal and cleaning we recommend you turn off the power to the furnace.
Clean furnace temperature sensor.
To fix this problem of the flame sensor not allowing the furnace to light we must clean the flame sensor.
If cleaning your flame sensor did not work it s possible that the sensor is broken and that the furnace is operating as it should.
Just remove one sensor and replace it with a new sensor.
If you re willing to risk 120 and buy all three parts ahead of time you may be able to fix your own furnace in less than an hour and save a 125 service call.
Then to clean the blower assembly remove the front panel clean the.
Check the flame sensor if present.
Remove it by pulling it down out of its bracket.
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In some furnaces this is easily done while with other gas furnaces the flame sensor is difficult to remove for cleaning.
It turns out that most of the problems are caused by a clogged furnace filter or any of three easy to fix parts the igniter the flame sensor and the furnace high limit switch.
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You may need to replace the sensor in which case you can follow these same instructions with the exception that no sanding is involved.
If the filter is dirty replace it or clean it with soap and water if it s not disposable.
The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting.
Common replacement flame sensors.
Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket.