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    joeygambino's Avatar
    joeygambino Posts: 1, Reputation: 1
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    #1

    Nov 19, 2017, 10:41 AM
    Buderus boiler not firing...
    I have a Buderus boiler. Two zones, Taco valves. Boiler isn't firing. I've replaced the transformer behind the switch. When I take a multi-meter to either the zone valve or the R and W leads in the boiler, the boiler fires. I have replaced the batteries in both thermostats. I also replaced ONE of the zone valves. I don't think I've screwed up the wiring, but who knows. I believe the white wires for the thermostats are going to terminal 1 on the valves. Any suggestions?
    talaniman's Avatar
    talaniman Posts: 54,325, Reputation: 10855
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    #2

    Nov 20, 2017, 09:35 AM
    If your boiler fires when you bypass the thermostat then the thermostat is bad, be it the wiring or contacts. That's where I would start by eliminating the thermostat. Seems like you have already done this or am I misreading that you got the furnace to fire?

    If Not then do THIS

    How to Test the Thermostat on a Gas Furnace | Home Guides | SF Gate
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