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Burner will not fire!

jmob77jmob77 Member Posts: 39
Hello, all. I have a two-zone hot water system that just had a clean bill of health from the plumber who came in to replace a corroded, leaky feeder and a bad gauge.
I've been trying to run it on some chilly nights to no avail. Pilot is lit, pump is running, everything seems to be as it should, but the burner does not fire when the thermostat kicks in.

Is there anything obvious I may be missing before calling the plumber back in?

BTW-There is a pair of black wires with terminal clips connected to nothing coming out of the top of the boiler. Did my guy forget to reconnect something, or are these for some other purpose?

Many thanks,

John
Brooklyn, NY

Comments

  • SteamheadSteamhead Member Posts: 14,190
    I'd bet that's your problem. Those wires are probably for a blocked-flue switch that is mounted on the draft hood (looks like either a mushroom or a box with the smoke pipe connected to it). See it you can find a small device with a pair of terminals on it.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
  • jmob77jmob77 Member Posts: 39
    Found the terminals! How will I know if I have the proper polarity? There is a schematic on the access panel, but I'm not totally sure what I'm looking for.
  • rick in Alaskarick in Alaska Member Posts: 1,147
    Most likely it is just a switch wire, in which case it doesn't matter which wire goes on which terminal.
    Rick
  • 1hoteatech1hoteatech Member Posts: 5
    Yeah sounds like the t-stat wires are not connected, do you have a primary control or an old stack switch?
  • jmob77jmob77 Member Posts: 39
    Just a stack switch, I think: a switch embedded in the flue hood with two terminals sticking out. No control unit.
  • jmob77jmob77 Member Posts: 39
    Problem solved! Connected those wires and it works like a dream; thanks to all...
  • JUGHNEJUGHNE Member Posts: 7,880
    The plumber who gave this thing a "clean bill of health" must not have fired it before he left. If the homeowner found the wires, the serviceman should have noticed them not connected. :*
  • delta Tdelta T Member Posts: 816
    I am a little curious why they were disconnected in the first place...
  • FredFred Member Posts: 8,501
    Maybe for a chargeable call back? Stranger things have happened!
  • jmob77jmob77 Member Posts: 39
    Definitely gives me pause as to how thorough this plumber is.
  • JUGHNEJUGHNE Member Posts: 7,880
    Did he clean the boiler or flue pipe? That might be some saving grace for him......however most techs would not leave the site without firing it up. It is really embarrassing to, for instance leave the power switch/CB turned off, and then get a call back and hopefully the owner would turn the switch on.....makes you feel like dumb or dumber.
    delta T
  • delta Tdelta T Member Posts: 816
    JUGHNE said:

    Did he clean the boiler or flue pipe? That might be some saving grace for him......however most techs would not leave the site without firing it up. It is really embarrassing to, for instance leave the power switch/CB turned off, and then get a call back and hopefully the owner would turn the switch on.....makes you feel like dumb or dumber.

    It does happen to all of us at some point, but usually only once. It is definitely embarassing. I always leave the boiler firing as I am picking everything up. That way you KNOW its all good, and you get a chance to watch it and see the temp and pressure, hear any weird sounds, smell any weird smells, notice a relief valve dripping, or any other problem that was not immediately apparent during your repair or service.

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