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Buderus GB142 UBA3 blown fuse

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


  • HVACNUTHVACNUT Posts: 2,523Member
    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.
  • Robert O'BrienRobert O'Brien Posts: 3,146Member
    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.
  • ltobinltobin Posts: 3Member
    Found bad boiler circ. pump.
    Thanks for the help.
  • HVACNUTHVACNUT Posts: 2,523Member
    > @ltobin said:
    > Found bad boiler circ. pump.
    > Thanks for the help.

    Make sure you replace it with an OEM pump or equivalent.
  • ltobinltobin Posts: 3Member
    Replaced with the same Grunfos model pump. Works great. Thanks again.
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