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Thread: Boiler not coming on

  1. #1
    DIY Junior Member Dee001's Avatar
    Join Date
    Nov 2011

    Default Boiler not coming on

    Hello, i have three zones in my home and only zone 2 will turn on the boiler the other two zones thermostats dont work .... I was thinking bad thermostat or should i hit the red reset button on the boiler ..... Not sure what too do ....any suggestion ?

  2. #2


    You might want to provide us with some helpful information such as the type of boiler, type of zone valves and the controller.

    Pressing the reset button can't hurt anything but if Zone 2 is working and Zones 1 & 3 are not you don't have a boiler issue. Has anyone recently done any work in your house? Perhaps they upset the wiring to the transformer. Are the ball valves for zones 1 & 3 open?

    We really need more information.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Until you figure this out, you could manually open the zone valves of 1 and 3 (often a lever on the valve). Then, you'd have heat there, at least while zone 2 was calling for heat.

    Zone valves typically run off of 24vac through the thermostat wiring. If you aren't using a controller, then the zone switch's end switch can be used to control the call for heat to the boiler. Without knowing more specifics of your system, as said, it's hard to diagnose.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010


    I'm thinking you have a bad transformer or two bad zone valve heads
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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