ASI's  Simple Fix Gas Furnace Flame Sensor

A very common gas furnace problem

common gas furnace issue does not have to cost anything to fix and you would be surprised at just how easy it actually is to resolve the problem. What are we talking about here? The flame sensor.

The flame sensor is usually a small metal cylinder about half the width of a pencil and an inch or two long and will have a long wire or metal tube connected to it. The sensor will sit or be positioned directly in the flame itself... when it is lit of course and the sensor tells the control board that you have an active burner or pilot flame and when it is not working properly it will cause a nuisance by allowing the furnace to run sometimes, sometimes for short periods and sometimes not at all.

The problem is very common and can sometimes be rectified by simply cleaning the little metal probe that sticks in the flame. These metal probes are prone to getting caked with a deposit, usually an off white or brownish rusty color. This cake of crud prevents the sensor from heating up properly and provides the control board false readings for the flame condition.

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