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  1. I

    Grant Vortex coming on when not required

    Thanks Norcon. By zone valve do you mean the diverter valve within the boiler?
  2. I

    Grant Vortex coming on when not required

    My 5 year old grant vortex has just started coming on when the thermostat is not asking for heat. If i switch it off and back on at the main switch it seems to sort itself out, until the next time the thermostat asks for heat. Any suggestions?
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