Furnace Question.
 

My furnace stopped working. When I turn on the heat, it runs for a few minutes and then shuts off. It won't kick on the fan automatically, so no air is blown at all. When I put the fan on "ON" it just blows cool air.

After it runs for a few minutes I have to flip the on/off switch on the furnace to get it to run again, but then it just shuts off again.

I did install a new furnace filter a few days ago, but I suspect that has nothing to do with this.

Thoughts?

Is the burner lighting? Could be a thermocouple.

That or either a flame sensor or a pressure switch.

Hah. No, I don't see the pilot light.

Sounds like it is not lighting. It is probably going through the startup process bu shuts down when it doesn't get ignition. I have been through that crap before. That is, until I replaced mine almost 2 years ago. Better have a professional check it out.

Probably an electronic ignition. Don't mind Skip. He's old. Most modern furnaces don't have a pilot light.

Brain box is probably fried.

Upon further inspection, it is an electric ignition. (according to the sticker inside the access panel).

You can bang on the igniter sometimes and get it to manually start. bang on it with your hand and then set the thermostat to like 80 once you get it started.

I had to do that on a cold night like 8 years ago until I could get somebody to fix it.

There are also no flashing red lights. According to the blinky red light, nothing is wrong.

Good call, I was thinking about the electronic ignition as well. I just know most of my problems were either a blocked pressure switch rubber hose valve or a flame sensor.

When you turn the thermostat on do you here a constant clicking?

Negatory. Set it and forget it. After a few minutes it will give up though and just shut off.

Every minute or so I do hear the furnace "hiss".

Yep. I think my old furnace always seemed to have a problem with a blocked pressure switch.

Saul,
What kind of furnace?