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Buders H7 P12 Error

it1991 Member Posts: 7

I am seeing an error of H7 P12 on my buderus boiler. I understand that this means low water pressure but I am wondering if you have any advice on how to fix this issue without calling a plumber.
I can post a picture of my setup if it helps. Thank you for your help!


  • Ironman
    Ironman Member Posts: 6,876
    Find out what the COLD static fill pressure is and WHY it’s low. It should be at least 15 psi for that boiler. Check to see if the shut off valve on the fill line is open or the fill valve is bad.
    Also check the pressure sensing valve in the boiler. They’re known for clogging. This requires that the boiler be isolated from the system and drained.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.