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I have a Rudd deluxe 90 plus mod.uged-06emaes. The unit high limits and restarts immediately after total shutdown. (takes about 2 minutes after burner is shut down) The burner operates for 5 minutes only. Airflow problem? This install is in a duplex and both furnaces do the same thing!

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  • mikejwillis Jan 03, 2011

    The ductwork and blower are clean now. would you recommend removing the blower assembly to clean heat exchanger from below?

  • mikejwillis Jan 03, 2011

    Both units worked very well for years so I believe the ducts are sized properly. Dust has been a problem for a long time. (poor housekeeping combined with infrequent filter changes) I'm a little timid about disconnecting the circuit board as I know they can be fragil at this age. Maybe I can swing it up out of the way in order to remove the blower?

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Hi,
Yes air flow or gas pressure adjustment... too high...

heatman101

Posted on Jan 03, 2011

Testimonial: "You were right on! Keep up the good work and many thanks to this forum that I stumbled upon! I'll be back again I'm sure as I love to DIY"

  • 1 more comment 
  • D. Floyd Kolb
    D. Floyd Kolb Jan 03, 2011

    Yes, I would at least check that.... but is the ductwork sized correctly...???

  • D. Floyd Kolb
    D. Floyd Kolb Jan 03, 2011

    Okay... it's becoming clearer now....yes, the coils are probably filled with dirt, but also check the fins of the blower wheels while you have them out...they can fill with **** and then not move the proper amount of air...
    Usually you can get enough wire to just move the boards out of the way... the blower will also start to drop down as you start to pull it out of the slides...the two screws that hold the blower in can also be a bugger sometimes...it can take a lot of patience to get the blower out of there....and getting it back in.... well that's another story....have fun!!! The good news is that you just need to stay calm and be patient and it will all go together again....:-)

  • mikejwillis Jan 08, 2011

    Thank You heatman101!!! You get my vote. After all the tech work, it was clear what needed to be done. I found the secondary exchanger to be 100% clogged!! Just finished cleaning the one in the other unit. (remember it's a duplex) It was 33% clogged!! I had it cleaned a "few" years ago after it broke down and paid dearly for the nice guy that did the work. People!!!! Things that move air need to be cleaned ever so often. I see post after post of furnaces that cycle on and off like mine did...... CLEAN THEM!!!! Thanks again for giving me the "courage" to do it myself.......wasn't so bad at all. Mike

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