While working in the garage yesterday, I noticed that my furnace is cycling on and off *constantly*. I hear the gas jets kick on and they burn for about 15 seconds, then shut off. About 30 seconds later it repeats the process, over and over and over again. Only occasionally did the blower kick on where hot air was pushed through the house.
I don't know a dang thing about furnaces, but this can't be normal functioning of the furnace, can it?
-F
Nope. Not normal. If you know nothing of furnace repairs call a reputable repair company. It could be one of several things, but most likely a bada thermo-couple fo some sort that is causing the burner to shut down before the blower comes on. I'd get it looked into before the really cold weather hits!
Maybe a flame rectification problem....
Nope, definitely not normal. Could be a number of things (bad flame sensor among them).
Here is some troubleshooting help -- however, gas isn't something for the untrained DIYer to mess with. I'd recommend you call a professional.
Hi, How about starting with your furnace model? Tony
Not enough info to even begin to tell you where to look, but as others have suggested, if you are not familiar with the operation and sequence of proper events, call a company, and make sure they are licenced and insured.
snipped-for-privacy@comcast.net (Fleemo) wrote in news: snipped-for-privacy@posting.google.com:
Mine was doing that. It was the thermostat doing it.
There is a long list of possible causes. The least likely of all of these is the thermostat.
Gary R. Lloyd CMS HVACR Troubleshooting Books/Software
In general, there are two limit switches in the furnace plenum: the fan limit, and the gas solenoid high heat limit. It is obvious, in your case, that the fan limit is set too high and the heat in the plenum is rising above this setting to a point that the gas valve high limit is tripping the gas valve closed. When it cools, it turns the gas valve back on again and this cycle repeats. Find the fan limit and set it lower, maybe around 140 degrees and see if that will make a difference. From your description, it is obviously not the room thermostat. If you cannot change the settings on the fan limit switch, maybe it is broken and needs replacing.
Hmm. If you rectifier, that mean you put it out? (say it slow: Wrecked the fire)
Boy, you ain't got a clue.
If you were truing to be funny, you missed.
Sad part is that Chris was serious, and I really hope NO ONE in here is taking anything hes got to say serious...
In these parts, he would have already been arressted for contracting without a licnece.
Here too.
Except it would have been a license....
typos....typos...
if that will make a difference.<
Anywhere online where I might see a photo or diagram of what the fan limit looks like? I'd rather attempt a simple fix first, and if that doesn't work, wait ten days for a pro.
Heatman, unlike you Chris, knows what he is talking about and in this case, you are wrong, and hes right...about the term used...
Dumbass is too nice a term for you.
Say it slow...dum ahssss
Looked it up...limited support from Carrier.
Depending on your part of the country, thats normal for this time of year... Also, since the election, this trades business has taken off for the better companies.
and you should, since if you dont know what it looks like, or even if you have one, you can create more damage than you have now. Not all of those old Carrier/Payne units had them. Particularly since the blowers were on timers that were hardwired into the controls.
Depends onthe thermostat you have. While the least likely item would be the stat, its possible you are #10, and 9 out of 10 issues are not the thermostat, perhaps your numbers up. Wait a bit, get the tech to check it.
Check this out for starters...
You on drugs or something?
Not really...I dont do that s*it. Dont drink either...but Chris has to be on them...
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