Furnace troubleshooting

[JTsyo]

The pilot light is on in the gas furnace but the burners aren't coming on. It's a 3 zone heat so I tried turning up each of them, no luck. What should I look for or try?

 

[highland145]

My exhaust fan died once and the unit would not come on. $60 for the fan, iirc.

 

[skull]

Is this a 70 or 80%er? Do you have 24 volts to the gas valve?

 

[bruceb]

Check the Thermocouple ... when they go bad furnace will not fire. Easy to change and not costly.

 

[Linflas]

Depends on the furnace. Get the model number and search for it. If you have a multimeter and some familiarity with using it you should be able to figure out what is going on with it. There should be an electrical diagram affixed to it to help you as well. Ours died in the middle of winter a couple years ago and after troubleshooting it using the diagram, a meter, and some helpful info I found with google I was able to fix it and get it running again. It turned out to be a stuck thermal switch that needed nothing more than a tap to unstick it.

 

[JTsyo]

Check the Thermocouple ... when they go bad furnace will not fire. Easy to change and not costly.

how do you tell if it's good or not? Need a multimeter?

 

[JTsyo]

Just to follow up on this. There was a temperature sensor on the chute that shut down the furnace. The technician from PSE&G reset it and all was good. No charge either.