Janitrol induction fan wont shut off


Old 11-10-04, 11:15 AM
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Janitrol induction fan wont shut off

I have a Janitrol gas furnace that is giving me problems.

It sometimes cycles ok and the limit switches drive the burner and blower OK I think. However, about 5 times out of 10 the induction fan will "stick" on and stay on forever.

To get it to cycle off I have found I can flip the tstat back and forth a few times and it will then switch off immediately.

Help me figure out where to look please. I've read a little here and it looks like the induction relay and/or control board, but I'd love some more detailed guidance.

Here's the details: Janitrol/Goodman GUP075-3A 75kBTU NG upflow, S/N (date?) starts with 91.

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Old 11-10-04, 04:49 PM
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if there is no call for heat (24 volts from R to W) and the inducer is running, either the relay on the board is sticking or there is a limit possibly open.
Old 11-10-04, 07:59 PM
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So help me out on this relay idea.

I see a "solenoid" type relay box about 1.5" square up near the vacuum switch that lets the 24v turn on the 120v to the induction fan.

To me that is the fan relay.

But it sounds like you are talking about some "micro" sized relay inside the control board?

BTW it was stuck today after I posted so I smacked the side of the furnace near the control panel (but kinda near the solenoid too for that matter) and it has bee working fine since. Hmmm.

I'm wishing it would stick on again so I can poke around looking for 24v (or the lack of it) here and there but now it works! Darn.

I'm thinking if it's stuck on and the solenoid has no 24v then it's THAT relay. If it's stuck on and there is 24v juice at the solenoid then it must be "your" relay in the control board.

Am I thinking straight and do you mean there is a little relay inside the gray control board box? Found those online today for about $110.

From other reading it seems that Junkatrols don't reallly deserve much TLC and I should just buy a new Lennox or something that's not junk.

Thanks for any replies.
Old 11-11-04, 04:24 AM
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If you keep it cleaned and serviced it will work fine. "We do tend to call them Junk-a-trol though"

Next time it does this instead of smacking the side of the furnace just tap that relay. It is probably the culprit.
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