How To Clean Your Furnace Flame Sensor

Replacing a broken flame sensor.

How to clean your furnace flame sensor. If your gas furnace in not staying on the problem is usually a dirty flame sensor. Ideally you want to call a professional hvac cleaner to clean your flame sensor. The flame sensor is a thin metallic rod attached with a single screw below the burner. The flame sensor is one of the most delicate parts of the furnace and has to be handled with care.

A furnace flame sensor works by detecting the presence of a flame within the furnace. If cleaning your flame sensor did not work it s possible that the sensor is broken not dirty. If your furnace seems to shut down on its own and no longer works as efficiently chances are your flame sensor needs to be cleaned. To do that you can follow these same instructions except that no sanding is involved.

First turn off the furnace and then use the screwdriver to open the furnace door. Step 1 remove 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. How a furnace flame sensor works.

The furnace door can be opened easily and once opened you can access the internal part of the furnace. Just clean the flame sensor and your furnace will stay on. This is an eas. Remove this using the screwdriver.

The sensor is a short length of thin metallic rod that creates a small current of electricity in order to confirm there is fire burning within the furnace. You may need to replace it.