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Electric hum

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Big Ed_4
Big Ed_4 Member Posts: 2,799
in THE MAIN WALL
....relay which controls the circulator.

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  • James_28
    James_28 Member Posts: 2
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    Electric hum from Taco pump

    I have an Electrolec electric boiler with a Taco pump and honeywell pump relays. When the boiler shuts down the Taco pump has an electric hum coming from it. This is something new as the pump never had an hum to it before. If I disconnect the power to the pump it still hums. If I shut off power to the boiler then the hum stops. Any suggestions?
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