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Utica Combi Boiler (MAC-150)-Error 133- Causing big bang noise after few trial of combustion

hcpatel78
hcpatel78 Member Posts: 157
in Gas Heating

Hello All,

I have Utica combi Boiler ( Model # MAC-150) installed few years ago. Lately it is throwing 133 error . I just cleaned the Flame sensor but still it is throwing 133 error after few times trying to get ignite when hot water calls.

Heating is off by the way.

Also when it ignites after few trials it makes a loud ignition bang noise that is scary .

Please advise what needs to be done to resolve 133.

Condensate line checked— Not clogged

Gas line—-3/4" sized…

Thank you,

Thank you,
Hiren Patel

Comments

  • 109A_5
    109A_5 Member Posts: 2,570
    edited July 23

    Was everything on the list for that error verified ? If the spark is poor OR not where it needs to be it won't work correctly.

    image.png image.png image.png image.png

    https://uticaboilers.com/wp-content/uploads/2022/02/MAC-Boiler-Manual-REV-A-WEB.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    hcpatel78Alan (California Radiant) Forbes
  • HVACNUT
    HVACNUT Member Posts: 6,944

    Yes, its scary. Which is why there are qualified people in the trade to make sure your extremities stay attached to the rest of you. A few years is 3,4? Has it ever been serviced? Has it ever met a combustion analyzer?

    mattmia2SuperTechEBEBRATT-EdAlan (California Radiant) Forbes
  • SuperTech
    SuperTech Member Posts: 2,616

    I would definitely check the vent pipe and air intake. Tuning it with a digital combustion analyzer is crucial. These things are not good to go out of the box. Professional installation and maintenance are needed for reliable operation.

    mattmia2EBEBRATT-Ed
  • hcpatel78
    hcpatel78 Member Posts: 157

    hello all . Thank you for all suggestions. It turned out that Igniter was not working properly. Replaced Igniter and Flame Sensor solve the problem.

    Thank you,
    Hiren Patel
    109A_5Alan (California Radiant) Forbes
  • hcpatel78
    hcpatel78 Member Posts: 157
    edited July 28

    "

    Was everything on the list for that error verified ? If the spark is poor OR not where it needs to be it won't work correctly.

    image.png

    "

    Yes you are absolutely right.

    Thank you,
    Hiren Patel
  • budalb
    budalb Member Posts: 23

    I had the same issue. It ended up with the igniter being deformed or bent so much. I bought a new one and run auto calibration procedure per instructions coming with the part. I believe this is a design flaw. Anybody having the same issue should check the igniter.

  • Jamie Hall
    Jamie Hall Member Posts: 26,257

    And since when is a bent or damaged part a design flaw? What are we coming to…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    GGross
  • budalb
    budalb Member Posts: 23

    The boiler was installed new. So the manufacturer put the part in. I believe the part bent under normal operations, which shouldn't happen. If deposit accumulates on it, I would call it normal wear.

    https://forum.heatinghelp.com/discussion/comment/1862688#Comment_1862688
    GGross

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