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  1. J

    Central Heating Pump Runs Continuously

    Ok so which one or both MV's do I change. The system has 2 x 2port MV's fitted. I've had a play this morning and they seem to be working ok but the HW MV was sticky. Pump is still running with the system off. Also the boiler does cut in intermittantly when the HW and CH is turned off on the timer.
  2. J

    Central Heating Pump Runs Continuously

    the boiler is a Potterton Netaheat Profile 80e.
  3. J

    Central Heating Pump Runs Continuously

    Yep I thought that might be the case. But when I turn off the CH and the HW independantly. They both activate.
  4. J

    Central Heating Pump Runs Continuously

    Hi, Any ideas please. My central heating has been running fine up to about a week and half ago when the cold the cold weather hit. Now the CH pump will not shut down it runs 24x7 whether the heating is on or off. I've tried changing the frost stat ( The boiler is in the garage) the pump overrun...
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