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R8285d 5001 Fan coil relay

Burnham boiler 204 NIL - TE12; 2 year old boiler- no melted wires, good condition relay burns our replace it and its fine for 2 hour's then burns out again- install 2nd relay same thing. I bypassed the damper and it still burnt out.

Also happened recently on a new Utica boiler- we replaced

the damper & it was fine.

Lastly- when a transformer overheats/ smoke coming out of it & you shut the switch off right away is it really blown? Will the transformer be fine when it cools down?


  • Jamie Hall
    Jamie Hall Member Posts: 15,419
    I'm no expert

    on the wiring of your boiler.  However, there are general rules -- and one of them is that a relay coil or transformer overheats or burns out it's getting too much current.  In the case of a relay coil, either the voltage is too high or somewhere in the circuit there is supposed to be a resistance and isn't.  It should say, somewhere on the relay, what the rated voltage is, and you could check that.

    And in answer to the last question -- sorry, but yes.  If a transformer or relay coil overheats and smokes, or you see any distortion on the coil at all, it's gone.  There's always a chance it may work for a while, but it's not trustworthy nor particularly safe -- and there is no way you can shut it off by hand to save it once it starts to show signs of problems.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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