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Post Info TOPIC: Furnace blower acting up


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Furnace blower acting up


Hello, I have a 25 year old Comfortmaker gas furnace with a standing pilot. The burners kick on like they are supposed to , but then the blower doesn't kick on when the heat chamber gets hot like it is supposed to. The burners will turn off and then a minute later or so the blower will come on for just a minute or so is all. If i turn the thermostat way up it will get warm inside the house but the burners are on almost all the time and the blower seems to run off and on when it wants to. I have cleaned the burners and furnace to no avail. I called a guy and he said it sounded like a circuit board to him. I have been without work for so long now that my money is tight and was hoping i could fix it myself. I do have some lawnmowers to trade for a good price if i could find someone willing to deal with me. Just what is anyones opinion on what they think it might be? The guy i talked to said the circuit board is probably $100.00 or so. Does that sound right? Any help would sure be appreciated...thanks...Dur

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Is there circuit boards in a furnace that old?.........

I know my old furnace at my old place had a temp switch to make the fan go on and off......when it reached a certain temp it came on....and if it got too hot, it would shut everything off.......Sounds to me, that is what is happening here. I had a similar problem like that one time with it and it was just a loose wire....check all your connections.

BTW......the no money thing....Welcome to the club....That was one of the main reasons I started this forum..........The other guys here will just tell you I am cheap.....Well, that's true too..............LOL

Also...Paul, one of our members is good with heating.....he logs on most days....I am sure he will comment on this.

-- Edited by poncho62 at 10:36, 2008-12-28

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Yeah, Paul is probably the man for this one, but the 2 things that came to my mind were #1...what Poncho said and #2 the thermostat may have an issue. confuse It's been over 10 years since I had a furnace though. hmm


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Just look around for a circuit board. I had a 25 year old furnace in our house back in 2003. It acted the same way although I think the problem was an issue with the pilot and another item. It had electronic ignition though. Wish I could remember.

Circuit boards will act funny like this. Also be sure to check and/or clean all connections as Poncho said, this is muy importante. The cost of a circuit board will depend on the supplier and manufacturer. $100.00 or less sounds about right. I would get on this soon though...........if the burners stay on too long without the fan, then it is cycling on the hi-limit switch which is not designed to act as a thermostat. It is there should the furnace get too hot.

Back in my boiler days, I really liked the older stuff...........simple, uncomplicated, then everything went electronic. You could test the circuit board to see if that was the problem, but if it was, there was no fixing it, you just tossed it. Progress??????????? Hmmmmm

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Your fan - in the heat mode - is controlled by the combination fan/limit switch it should be located above the gas valve... trying to attach a photo but dont know if it will work?

If the fan runs in the ON position, then check out your combination fan/limit switch and see that the round dial on it actually rotates in a clockwise position while the burners are lit. When it reaches a certain temperature the dial will turn past an adjustable pin in the face. If it passes that location and the fan does not come on, I would suggest replacing the device. 

 If you replace the switch there is a break away tab at the 6 o'clock position that has to be kept in place or broken off depending on if the safety controls are low voltage or high voltage. It takes the same switch but it is configured different by removing the tab .... If you get it wrong you will send 120 volts to the thermastat.

I'm not a furnace person but I replaced one for a friend a few years ago on a 20 year old comfortmaker .... hope this helps



-- Edited by Beez at 12:00, 2008-12-28

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Dur, I have the same setup Beez just mentioned. The fan/limit switch looks a bit different but almost identical. Standing pilot model.

This fan/limit control has factory settings but can also be adjusted if need be. It sounds to me like you may need a new one of these as this setup is pretty simple. I found some online at the Lennox site. Look around for comfortmaker online. You may need to pull yours to see the exact length of the probe, assuming it has one. I don't have a good site for HVAC stuff so you'll have to do a little searching.

Wish I could be more help..............John

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 Hi Durwood Paul Morford here. Have you looked to see if you think  this
 fur. has a board. If it is that old you might have a fan switch like the other guys are showing you. Does this fur. blow the heat up or down???
 If it is a down flow fur. it might have a limit switch in the top blower area. If the main fan switch is not working, when the heat comes up to hi limit and turns burnner off, the limit switch will turn the blower on for a short time.  It would help if you could scan in a a electric diagram or some pic of your controlls. As far as price on electronic boards , i have about 12 of them in my service truck, and my cost is from $65.00 to $165.00.
 Some of the old Honeywell fan switches like the guys were showing you 
 have a white push,pull switch on them to run the blower all the time.
  Get back with me and we will go on with this   Later Paul
 

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Paul Morford


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Hey guys thanks for your responses. It is an upflow furnace. I'll try to get pics of the inside of it maybe later today if i get a chance. thanks again.

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 Hi guys Paul  here, The name of a fur. does not mean much unless we
 are using model and serial no. to look up parts. The fur. co. do not make there own control parts. Most fur. co. just buy most of there controls
 from others. In most cases i need to see pic. or scan in a wiring
 diagram.   Later Paul

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Paul Morford


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Here are pics of my furnace.

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 Paul here. that electric box in your first pic., from left to right, what are the letters of the screw post? I take it you do not have air con. on this fur.
  If there is a fan switch it would be up above the electric gas value??
                                                                        Paul
   

 

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Paul Morford


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 That fan switch is hard to see. if it is there , you have to look above the
 gas value up under that sloped metal diverter plate. Two small screws
 on the front of the fur. will let you on hook this plate to look or take a pic of the fan switch   Later Paul

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Paul Morford


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Sorry i haven't gotten back with you but like i said i have had serious health problems. I had somebody come and look at the furnace and it is shot. The heat exchanger has gone bad causing the burners not to heat properly. So for now i am just heating with little electric fan heaters because i have no money to buy a new furnace. The litte heaters (3 of them) are keeping my house at 68 even when it got 10 below here. So come summer or fall i'll put a new furnace in. Thanks for all your input here.

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You are welcome Dur.........The fellas at the tractor forum were a little worried as to where you disappeared to....Good luck.

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Dur, If the heat exchanger is bad, it can be very dangerous.  Leave it off until you can replace it.  I know you don't want to, but if you need something just let us know and we 'll try to help.  We all have hard times now and then.  Do you need more heaters??

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is your furnace to old to be under warranty for the heat exchanger. if the rest of the parts are in good shape
you can maybe can just put a new heat exchanger in it, if they still make them, what brand is it? paul

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Paul Morford


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It is a 25 year old comfortmaker furnace. I turned it off and shut off the gas to it so its safe in my house now. I have four of those little heaters and am only using three of them which is enough to keep my house warm. I was wondering why a heat exchanger couldn't be replaced but the guy who looked at it said it couldn't. It is only a 60% eficient furnace anyway so i do need probably at least an 80% eficient.

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Let me echo what the others have said.
Good Luck and be extra careful with those electric heaters because they can also be very dangerous if not used properly.

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Hi Durwood Paul here. I don't where you are at in Ohio, but if you was ever coming up north on a trip, I would see to it that you get a 80 plus furnace at cost. You would have to give me info on your furnace and house size.
If you ever want be talk to me about it, here is my email. paulm989@yahoo.com Later Paul

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Paul Morford


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Thanks Paul. Carter lumber and the furnace man both sell an 80% furnace for $600.00. That is a heat only furnace. The furnace man says his is warranted for 10 years and i think Carter is 5 years. My house is only 12-1300 sq ft so about a 50,000 btu is plenty which is what is in it now, and it was always big enough.

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