Older Harman pf 100 furnace

[Hohner v5]

i have tried just about every, the only way that I can get it to run if I jumper the pressure switch , I replaced the gaskets tested all the motors replaced the igniter new esp , I even replaced the pressure switch ,still won’t run , is it a bad control board?

 

[AndrewChurchill]

I had a PB105 and I had that issue once. I figured out the door to my ash can wasn't closing tight enough and air was seeping through. I had to hammer the latch until the door sealed properly.

 

[Mr know it all !!]

I had a PB105 and I had that issue once. I figured out the door to my ash can wasn't closing tight enough and air was seeping through. I had to hammer the latch until the door sealed properly.

thanks for the reply ,i did also ,still no go

 

[heat seeker]

Seems to me, that if it works when you jumper the vacuum switch, the board is not the problem, unless it is not driving the combustion blower fast enough.

Basic question - are you SURE the stove's passages and venting are clear?

 

[tnpete]

Ours would not run last winter. Never figured it out, so let it sit. last fall went to work on it again. And it fired up. But I also started the fire by hand.
Like you I had done everything, I could think of to get it running. That was the first issue in I think 11 years with our Furnace.

 

[Former Farmer]

Bad gasket somewhere? Sounds like you have an air leak somewhere.