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Put mouse over the area above to play video. Is this happening to you? There are a
number of reasons why a furnace will short cycle like this. But I am only
covering this one for now. This is a Janitrol Furnace. And it is installed
upside down. So it may look like yours but it is upside down. On this unit,
sometimes it would start and run for hours even days then it would do what it
did in the video then it stopped all together. and just kept short cycling. I
could see the igniter was working because I could see it glow. so I knew it was
not that. The next step for me is the flame censor. This is the way it works
thermostat calls for heat, combustion motor comes on draft is good, power is
sent to igniter, igniter gets hot, power is sent to gas valve to open gas valve
opens for a few seconds waiting for a signal from flame censor. if it gets
signal the gas valve stays on till limit is reached if no signal from flame
censer, gas valve is turned off. and the cycle starts again, and will do this a
few times, after it fails a number of times the circuit board locks out and the
red light blinks out a warning.
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Click on any of the above pictures to see a larger view. The problem is the
flame censor (on this unit, you can have the exact symptoms and it could be
another problem) And the solution is simple. take it out, clean it with a fine
file, get all the carbon off of it and put it back. the only time you have to
replace then is if the porcelain is cracked. the fourth picture from left shows
where it is mounted (remember this furnace is upside down) next how dirty it is,
then how to clean it. and how it should look. Good luck,
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