Lennox furnace problem - Page 2
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  1. #14
    Join Date
    Feb 2003
    Location
    garland, texas
    Posts
    662
    forget timer setting. the second stage board is set for what operation, one/two/timed?

  2. #15
    Join Date
    Aug 2001
    Posts
    212
    w2 timed

  3. #16
    Join Date
    Feb 2003
    Location
    garland, texas
    Posts
    662
    did you remove stat from circuit and operate directly at circuit board?

  4. #17
    Join Date
    Aug 2001
    Posts
    212
    No I did think of that later that I should have taken the stat out of the circuit and just jumpered it at the board.

  5. #18
    Join Date
    Feb 2003
    Location
    garland, texas
    Posts
    662
    thats the place to start. could be stat,wire between stat and furnace. if something chatters its usually because of low voltage,short or conflicting signals.

  6. #19
    Join Date
    Aug 2001
    Posts
    212
    High fire pressure switch is cutting out after about a min.
    I checked pressures with a monometer it does go down after the furnace heats up for awhile. I checked all over the heat exchangar for cracks but had no luck. I would like to go back and take apart the collector box area to see if there are any problems in that area.

  7. #20
    Join Date
    Mar 2001
    Posts
    715
    Grovecreek
    When the G32's first came on the market I had one do almost exactly the same thing. I changed the circuit board and it still had problems. The problem with that furnace was a improper ground, just thought I would throw that out there, it is an easy thing to eliminate as the problem or correct if it is.

  8. #21
    Join Date
    Feb 2004
    Posts
    2,458
    From past experience with T-87's I would encourage setting heat anticipator with a meter. Just thinking out loud. What would the amp draw be from Low to High fire??

    [Edited by mike3 on 02-10-2005 at 10:04 PM]

  9. #22
    Have you pulled the flue to make sure its all open. Sounds like high fire pressure switch dropping out.

  10. #23
    Join Date
    Nov 2004
    Location
    redlands, ca
    Posts
    49
    Call Lennox Customer Support @ 1-800-453-6669. Have the entire model and serial numbers ready. Ask if this was one of the units that had the combustion blower motor recalled for that very same problem. I must have changed out about 20 or so due to the very problem you are describing.

  11. #24
    Join Date
    Aug 2001
    Posts
    212
    Yes I did go through tech support out of Texas we have it narrowed down to pressure dropping as the furnace heats up. When you pull the vent pipe off it is even more free flowing So the furnace combustion area is sucking in fresh air from somewhere.

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