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  1. #1

    Honeywell Burner Control on boiler

    I've been working on a natural gas boiler with a ST7800 A1039 0046 (Device RM7895A) Honeywell Burner Controller. Every few days the controller will trip out with an Internal Fault code of 35. Everything seems to be running/checking out fine, I just need some suggestions. We have replaced the burner nozzle and Honeywell burner controller.

  2. #2
    Join Date
    Aug 2006
    Location
    ohio
    Posts
    259
    You replaced the burner controller and it still trips on on internal fault or you haven't given it enough time to see if it does it again. I just wonder because I have three units that occasionally trip on this and I thought that they needed replaced. Just curious.

  3. #3
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    I have seen this happen due to the Control not being grounded and "IF" the air pressure switch input "flickers".

    Adjust switch and call it done

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