Clean Furnace Temperature Sensor

Lightly clean the surface with fine emery cloth and slip the sensor back into its bracket.

Clean furnace temperature sensor.

Remove it by pulling it down out of its bracket. To clean a furnace start by turning off the furnace then removing the access panel on the outside of the furnace and inspecting the filter for dirt or damage every 3 4 months. In some furnaces this is easily done while with other gas furnaces the flame sensor is difficult to remove for cleaning. 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.

Your readings should be 1 5 to 4 ua some manufacturer s control systems only need 0 5 ua so check the manual for the system you re testing. To fix this problem of the flame sensor not allowing the furnace to light we must clean the flame sensor. 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. You may need to replace the sensor in which case you can follow these same instructions with the exception that no sanding is involved.

Common replacement flame sensors. Ami parts furnace flame sensor for goodman 0130f00010 fit b1172606 b11726 06 20488501 acs90453bxa p1257001f p1257007f acs90703bxa p1257002f p1257008f replacement 4 5 out of 5 stars 73 4 39 4. If the filter is dirty replace it or clean it with soap and water if it s not disposable. Just remove one sensor and replace it with a new sensor.

Check the flame sensor if present. 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. Http amzn to 2xcwdbv york luxaire tempstar. Hook up your multimeter in series with the flame sensor and the sensor wire and fire the furnace in a heat cycle.

The flame sensor occasionally becomes coated with residue and will prevent your furnace from lighting.