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Hot water Boiler zoned system

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New to the site, I don’t have much experience with boilers hoping you guys could help point me in the right direction. I have a hot water boiler I’m looking at with 3 zones, when one zone shuts down the other two heads also trip. And shut the whole system down. After the one zone shuts off the pressure relief valve goes off. I know the expansion tank is bad i’m going to change that. I’m thinking there may be to much water in the system but i’m not sure what would make the other zones close. Thanks

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  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    Welcome!

    Have some pictures? Zone valves it sounds like? What brand and how are they powered and wired?
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
    Mheatinguy
  • Intplm.
    Intplm. Member Posts: 2,011
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    Please post some pictures of your system from a distance and some close ups of your components.
    This should help with getting to the bottom of your problem.
    Mheatinguy
  • Mheatinguy
    Mheatinguy Member Posts: 2
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    I got the zones figured out now I’m having issues with the boiler shutting down. It will cycle on and off twice like it’s supposed to, no safety switches are opening but for some reason it won’t come back on.
  • Grallert
    Grallert Member Posts: 665
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    what are you doing to get it back on?
    Miss Hall's School service mechanic, greenhouse manager,teacher and dog walker