Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Vaporstat sticking ?

cdm Member Posts: 77
Vaporstat set at 0 oz. and diff. at 8oz. Problem is the Vaporstat does not shut off burner and pressure keeps building. If I tap the Vaporstat when it is above 8oz. The burner turns off, and restarts as normall at 0 oz. Is there a way to unstick the Vaporstat, or do I just bite the bullet and replace it?


  • Jamie Hall
    Jamie Hall Member Posts: 16,618
    Try setting the cutin to 4 ounces. A cutin at 0 can have rather bizarre results -- although the most common one is the opposite of the problem you describe; on occasion the vapourstat will not restart the burner.

    Also check with a reliable low pressure gauge. The vapourstat may simply be out of calibration (in fact, if it reliably restarts with a cutin of 0, I suspect it is, perhaps markedly so).
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    EBEBRATT-Ed Member Posts: 9,727
    Make sure your pigtail and the piping into the boiler is clear