Thread: Need help House furnace

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Steve, one part of the house is warm the other part is pretty cold. It was a big shock to come home at this time of the year and have a furnace not working. I looked on youtube trying to find out how to check a transformer; I found some pretty good information on checking the transformers. I found out the hard way with the last break down there are certain wires you don't want to touch at the same time.

If I can't get it fixed by Monday I'll have to call for a repairman. I have a feeling it's the universal motor I put in last year. I had to have the guy walk me through putting different color wires together to make it work. The motor was warranted but I would have to drive to Chicago to get their replacement.

My wife said if I could make it in a tent when I was in boot camp in January I could make it now for a couple of days.

The real kicker is I just bought a 75,000 BTU unit furnace for the garage this past Monday because I was having trouble with the 100,000 BTU already there.

There are people that are having a harder time then me so I'll try not to complain.

Richard

unwire the transformer and ohm with ohm meter it should have resistance, or it should have 24-28 volts ac, does the furnace try to light, it could be the relay that is built into the board, not sending power to the blower motor, look up ignition sequence for your model the inducer blower should come on when you call for heat if that does not work and it goes off it could be the pressure switch, does the ignitor panel ever light, if it is lighting then kicking off the relay fro the blower can be bad, ohm out the blower motor, and make sure the capacitior is ok, try to start it by turning on the power and sit in front and watch what happens, the inducer fan should come on followed by a delay. the ignitor will light , the gas valve will open, if it shuts down down right away , it could be the flame sensor i hope this helps,

Originally Posted by simpsongreg68

unwire the transformer and ohm with ohm meter it should have resistance, or it should have 24-28 volts ac, does the furnace try to light, it could be the relay that is built into the board, not sending power to the blower motor, look up ignition sequence for your model the inducer blower should come on when you call for heat if that does not work and it goes off it could be the pressure switch, does the ignitor panel ever light, if it is lighting then kicking off the relay fro the blower can be bad, ohm out the blower motor, and make sure the capacitior is ok, try to start it by turning on the power and sit in front and watch what happens, the inducer fan should come on followed by a delay. the ignitor will light , the gas valve will open, if it shuts down down right away , it could be the flame sensor i hope this helps,

I am pretty much limited to changing parts but I don’t know which ones. I called about a transformer but I can’t get it until Monday. The furnace will not do anything, I switched the thermostat but since it quit when we were gone something could have burnt out. I have had frost get on the air intake an the furnace would not light, the inducer was trying to pull air but since it was blocked with frost it couldn't, and the inducer motor would run until I cleared the frost. When we left for the funeral it was raining then it got really cold so without being at home I'm thinking that could have been the problem? I just feel better when I know what the problem is. I'm not too good at troubleshooting.

Thanks for your help, I will go at it again tomorrow but I think it's going to be more then I can fix this time.

When the motor went out last year, and I had to get a universal one until the guy had me hook up the right wires even though they were different color the furnace acted like it is now so it may be another motor. The replacement motor was not the same speed as the original, I think we had a three speed and the new replacement was a two speed but it worked when he had me to hook up the right wires.

Richard