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American Standard EP-68 electric boiler Aquastat

Laura_s
Laura_s Member Posts: 7
in Thermostats and Controls

My American Standard EP-68 electric boiler water temperature is hovering at 200° while set for 160°. The thermostat is set at 62°, but it’s 68° in the house. I know I need to replace the t-stat as the heat does not shut down when the thermostat is off. My main concern is the water temperature in the boiler and I suspect it’s the aquastat. I can not find any repair company that knows anything about electric boiler furnaces to come out and look and I’m unable to find anywhere that has parts. Please help. If I can find an aquastat, I’m sure I can find an HVAC company to replace it. Aquastats are aquastats, are they not?

Comments

  • pecmsg
    pecmsg Member Posts: 5,468

    electric boiler furnace?

  • Laura_s
    Laura_s Member Posts: 7
    edited November 2024

    it heats my house, I call it a furnace. It’s a electric boiler for heat. What would you call it?

  • Jamie Hall
    Jamie Hall Member Posts: 25,181

    It's a boiler. Electric powered, but a boiler.

    The aquastat is probably quite ordinary — first thing I'd want to check is what it is actually set to. It does have calibrations on the dials…

    The thermostat not shutting the boiler off may — or may not — be the thermostat. Before you fire the parts cannon at it, try simply disconnecting it. If the boiler turns off, OK, probably the thermostat. Also try setting the control to some lower temperature? It turns off? Out of calibration. If it doesn't turn off if disconnected — it's not the thermostat and you need to look further. Disconnect the thermostat wires at the boiler end. Does the boiler turn off now? Wiring problem. And so on.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Laura_s
    Laura_s Member Posts: 7

    I’ll shut the power off, disconnect a t-stat wire and take it from there.

    Still need a parts source. Any recommendations? If only for future reference

  • Jamie Hall
    Jamie Hall Member Posts: 25,181

    Part's source? Depends so much on what is needed. Sometimes Amazon, believe it or not, or one of the big box home stores. Sometimes a good hardware store. Sometimes a specialty supply house.

    Trouble is, with any of those, you really need to know quite precisely what you are looking for.

    Try us — we try to be helpful.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Laura_s
  • Laura_s
    Laura_s Member Posts: 7
    edited November 2024

    Shut off power to boiler. Disconnected one T-stat wire. Powered boiler back on. Heat came on. Now what?

  • Jamie Hall
    Jamie Hall Member Posts: 25,181

    That sounds, unhappily, like a wiring problem. Next test is to go to the boiler and find out where those thermostat wires connect and disconnect one of them there. If the boiler behaves now… probably is the wire from the boiler to the thermostat.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Laura_s
    Laura_s Member Posts: 7

    I did disconnect the thermostat wire at the boiler. Turned the power back on to the boiler and heat is coming from the radiators.

  • Laura_s
    Laura_s Member Posts: 7

    OMG - I feel like an idiot! It was only 2 blown fuses!!

  • neilc
    neilc Member Posts: 2,901

    if you're fixed, you're fixed, but,

    can we see pictures?

    not sure how blown fuses makes heat stay on,

    can you show fuses you replaced, wide angle,

    known to beat dead horses
  • HVACNUT
    HVACNUT Member Posts: 6,437
    edited November 2024
    https://forum.heatinghelp.com/discussion/comment/1820605#Comment_1820605

    Sometimes fuses blow for a reason.

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