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Buderus GB142 UBA3 blown fuse

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ltobin
ltobin Member Posts: 3
Buderus gb142 UBA3 blows its fuse as soon as I turn the boiler on. What could cause this?

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  • HVACNUT
    HVACNUT Member Posts: 5,865
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    Sooo many things can cause that fuse to blow. If you had 20 fuses you could do process of elimination by disconnecting one molex plug at a time from the fan, gas valve, HSI, etc.
    You can open the manual and use its info to Ohm out the controls. You'll need very small meter leads to probe the sub base of the UBA 3. Or you can call a pro. He or she can make the repair, thoroughly check the rest of the system and do a combustion analysis. It's a win win.
    ltobin
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,542
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    Blower most likely. Unplug everything and plug back in one at a time
    To learn more about this professional, click here to visit their ad in Find A Contractor.
    ltobin
  • ltobin
    ltobin Member Posts: 3
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    Found bad boiler circ. pump.
    Thanks for the help.
  • HVACNUT
    HVACNUT Member Posts: 5,865
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    > @ltobin said:
    > Found bad boiler circ. pump.
    > Thanks for the help.

    Make sure you replace it with an OEM pump or equivalent.
  • ltobin
    ltobin Member Posts: 3
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    Replaced with the same Grunfos model pump. Works great. Thanks again.
    HVACNUT
  • vigef
    vigef Member Posts: 1
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    There's two fuses in this Boiler 1 at the external wiring panel And 1 at in the back side of the UBA 3 Control Which one of those Was popping ?