Gas furnace won't kick back on, pilot light still on?

Man...oh man...the answers I see on here.

The first thing to do is jumper the thermostat connections (temporarily) on the gas valve and see if the furnace kicks on.

If it fires up you either have a bad t-stat or it is wired incorrectly.

If it doesn't start up then you'll probably need a qualified technician to diaqnose the furnace for you. There is flame safeguards, proving circuits etc that you won't be able to diagnose properly yourself.

If you do try and diagnose it yourself, you will probably end up spending more money throwing parts at it than if you paid a technician in the first place.

Good luck with it!

So, turn the thermostat down even more, with a new one, you might need to go lower than you think to get it on. Are you sure you have put the furnace back into automatic mode, and not manual?

Papaw

Without diagnostic info your guess is as good as mine.

Possible problems:

Blown fuse

Dead transformer

Switch/power is off

Furnace blower door safety switch is not closed

Bad circuit board

Shorted wire

Bad gas valve

Bad ignition control

Loose wire

Open high limit

Open roll out.

If it has one, a bad inducer motor

Have you checked to see if you have 24 volts? If you don't it sounds like a transformer. If you do then check to see if you have 24 volts to the gas valve. If you do then the gas valve is bad. If you have 24 volts at the transformer and not at the gas valve then you have a safety tripped. Good luck.

Why did you replace the thermostat? was it bad ?

did this happen before you replaced it or after ?

did you shut the electricity off to it ?

did you forget to turn it back on ?

How much pressure is left in the propane tank? They do cut out at low pressure.

kick it again