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Ok, the problem is continuing... and really driving me nuts.

I have replaced the pressure switch (after taking most of the inside vent tubing apart and vacuuming it out to no avail), and it only...

You. Are. A. God.

I turned everything off (again) and decided to start looking where I could reach... i.e. the vent elbow... took the connecting pipe off and found... taa daaaa!! Dead bird.
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Vent pipe shares space with the water heater vent pipe... and runs up the middle of our two story house (it's in the basement) through the old coal chimney... completely encased in bricks. Any...

another update =(

Furnace switched off when it reached set temp, and I can't get it to come on again, even after removing the vacuum hose again.

I'm thinking the pressure switch is bad?

How...

Update:

I read up on the pressure switches and what, exactly, they did.

I ran a little experiment and at least for now, the furnace is working.

I said in my last post that I checked the air...

I found your forum after having some issues with my furnace. Age is unknown because I rent and my landlords are out of town.

When I went to turn the furnace on tonight, nothing happened. House...