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Room is above set temperature but thermostat is off. Why?

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Larry_38
Larry_38 Member Posts: 1
in THE MAIN WALL
My living room is 7 degrees warmer than my thermostat is set for which is unusual. The thermostat indicator light is off but heat is still coming from baseboard heaters. I have a weil mcclain GV3 with Taco 571 zone valves and white rodgers control relays. Where's the problem?

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  • Brad White_9
    Brad White_9 Member Posts: 2,440
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    Ghost Flow

    would be my guess.

    Newton's Fourth Law: Gravity Wins.

    See if you have thermal traps, flow checks or other means to prevent unwanted convective (gravity) flow.

    Edit: As Andrew suggests, a defective or held-open control valve will allow such flow to occur, either by gravity or more forcefully from an adjacent pump.
  • ALH_4
    ALH_4 Member Posts: 1,790
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    zv

    Could be a bad zone valve allowing flow when any of the thermostats is calling. Check if that zone valve is open with the thermostat off.
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