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The fan comes on, the burner ignites and then goes out withing 3-5 seconds. Fan continures to run another 30-60 seconds then it too shuts off. Also want to know if this furnace has a filter. We could not find one and I live in my trailer in an area that is very dusty.

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The flame sensor is bad. It is a simple replacement, although the style is a bit different from manufacturer to manufacturer.

Posted on Oct 09, 2010

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The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

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I have a Johnson air ease 90 plus.I turn the thermostat up and exhaust blower comes on igniter comes on and i can hear the natural gas release for a second or two then igniter shuts off along with gas. Fan...


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No i don't think your stat is bad as the unit is trying to run.There is a temp run switch in the plenum of the unit that could be causing this problem.

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