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Buzzing gas boiler

billybongo
billybongo Member Posts: 6
My 1970's gas boiler is making an intermittent buzzing noise.

This is only whilst it is heating up/operating.

I have uploaded a video of it here -

Any suggestions much appreciated!

Comments

  • Most boiler buzzing seems to come from the relay which in your case, sits under the transformer. Less often, it comes from the gas valve.
    Often wrong, never in doubt.
    HVACNUTDZoro
  • HVACNUT
    HVACNUT Member Posts: 4,185
    Its likely the coil for the relay.
    It's also likely your boiler wants an appointment with Dr. Kevorkian.
  • billybongo
    billybongo Member Posts: 6
    hehehe thank you for the replies. I may let nature take it's course...
  • billybongo
    billybongo Member Posts: 6
    I have had a quick look for the relay serial number and nothing for sale.

    I'm finding similar Honeywell relays. I need 40 VA and 27 Volt secondary. Would a relay with 38VA and 26.5 volts do the job?
  • DZoro
    DZoro Member Posts: 1,048
    Sometimes if you move/push on the relay box or the relay itself (remove cover) you maybe able to make the sound go away.
    That is also known as a fan center. I'm not sure if it is a dpdt, or a spdt, or other. If that is just controlling the burner, the 38 or 40va is fine. Description should be on the paper attached to the cover if you still can read it.
  • billybongo
    billybongo Member Posts: 6
    Ah thanks for the tip. I will try that tomorrow.
    The paper label is legible but no word on the poles.
    Maybe I can find just the relay if there is any part number on there when I take it off. Too late and chilly for that tonight!
  • billybongo
    billybongo Member Posts: 6

  • billybongo
    billybongo Member Posts: 6

  • HVACNUT
    HVACNUT Member Posts: 4,185
    You can use what's called a
    Fan Center Control Relay.
    It's a 115v primary, 24v, 40va secondary and is attached to a 1900 plate that will fit on the existing junction box.
    Connect R and G to the thermostat and a N.O. -| |- Contact on the relay for the burner circuit. Follow the schematic, and when done, try it with the gas off first.