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water pressure from city

I have a Laars Mascot II combi boiler. It's not working for the moment because of what I suspect to be low water pressure coming from the city. The alert code on the boiler is "3.5" at startup then it moves to "98 1" (no decimal point between the 8 and the 1).

Has anyone seen this before?



  • ZmanZman Member Posts: 3,175
    What is the pressure?

    If you measure the city pressure and it is less than 20 psi this may be the problem.

    I believe the mascot has a high head loss exchanger. If you are pumping out of it instead of into it I think that is likely your problem.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
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