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Thread: Macelectric

  1. #1
    Join Date
    Oct 2019
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    Macelectric

    Have an old Bryant 375a gas furnace.
    I am familiar with controls. Replace gas valve and pilot flame sensing switch 3 years ago.
    Started up today, cycled fine, main burners lite, then shut down 10 minutes later. All safeties read normal, high limit, draft inducer, ect. Sequence is t-stat call for heat draft inducer starts,After pick coil in mgv (main gas valve) fires,pilot lights via spark gen. Then, after pilot flame sensing switch heats, spdt contacts switch, (opens pick coil and closes circuit to mgv, but main burners don't lite. Testing pilot flame sensing switch checks ok, but seem to get back feed voltage from mgv to pick coil. I am thing mgv is failing.
    Any thoughts ? Adding info: pilot does remain lit after flame sensing switch opens pick coil. Flow sensing switch keeps power to hold coil in mgv.
    Thanks in advance.

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,447
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    You may be good with controls but obviously do not know furnaces.
    Safeties read open and or closed not normal. Sorry this is not a DIY site. See the big red banner on top!

  3. #3
    Join Date
    Oct 2019
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    Thread Starter
    Correct safeties are all closed. Ok sorry for the post.

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