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Buderus GB142/60 not firing for heating call

k_2
k_2 Member Posts: 30
in Gas Heating

System:

Buderus GB142/60

Buderus indirect tank

4 Grundfos circulators

Taco control box for standard thermostats

Have system pics if helpful

Symptoms:

When a call for heat comes it does not fire the burner

Turn up the hot water temperature and it will fire and run and apparently continue on until the end of call for heat.

Ideas?

Located Metro West 495 area. He has been having some problems getting service if anyone is interested. It does not leak and has been reasonably reliable thusfar.

Comments

  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,506

    Year of installation? Mad Dog 🐕

    Consulting by Mad Dog & Matt Jr.
  • Jamie Hall
    Jamie Hall Member Posts: 24,731

    Pretty well narrows it down to the control box… or the wiring associated with it.

    Do any of the circulators turn on when the associated thermostat is calling for heat?

    Really have to look at how the particular installation is wired to see where the signal from the thermostat isn't getting passed along. There are a LOT of different ways to wire these things.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Ironman
    Ironman Member Posts: 7,539

    Does the boiler have an AM10 outdoor reset control? If so, it’s probably in warm weather shut down. That means the control holds the heat off when it’s 68* or above outside.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    GrallertBig Ed_4
  • psb75
    psb75 Member Posts: 900

    Is it showing any error/fault codes on the display?

  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,506

    Ground control to Major Tom.. ....

    Consulting by Mad Dog & Matt Jr.
  • psb75
    psb75 Member Posts: 900

    Take protein pill. Put helmet on… and report error code

    Mad Dog_2
  • k_2
    k_2 Member Posts: 30

    Sorry, for some reason my comment did not show up even when I refreshed the browser, and I gave up looking.

    I did not see a separate AM10 control. This is not happening now, it is happening in cold weather

    I do not believe there are error codes

  • Big Ed_4
    Big Ed_4 Member Posts: 3,005

    Check the set points in the AM10 and the temperature sensors are in range….

    There was an error rendering this rich post.

  • Tom_133
    Tom_133 Member Posts: 910

    are you in warm weather shut down? You may want to check what you have that set for

    Tom
    Montpelier Vt
  • k_2
    k_2 Member Posts: 30
    https://forum.heatinghelp.com/discussion/comment/1807450#Comment_1807450

    The circulators do run

    I am going check with him on more specifics

  • k_2
    k_2 Member Posts: 30
    IMG_3364.JPG
    IMG_3367.JPG
    IMG_3365.JPG
    IMG_3363.JPG

    Some pics of the install

  • Big Ed_4
    Big Ed_4 Member Posts: 3,005
    edited August 12

    On a call for heat the wall relay will turn on the zone circulator and the end switch in the relay is wired to the AM10 to signal a call for heat… The AM10 control which is a outdoor reset signals the boiler what temperature to supply to heating zones …

    Simple 6 wire connection. .. Two to the boiler , two for the sensor and two for thermostat or end switch …

    The AM10 is obsolete and not available anymore … You can wire in a Tekmar with a supply sensor ..

    There was an error rendering this rich post.

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