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Central Heating and Hot Water problem

Discussion in 'Plumbing and Central Heating' started by sc29, 14 May 2021.

  1. sc29

    sc29

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    Noticed last night the house had got really hot. Thought it was a problem with out old analogue Honeywell room thermostat and ordered a new one last night. Never thought any more of it.

    Woke up this morning and the house was really hot and the radiators were really hot. Again thought it was the thermostat and turned the central heating off completely, leaving the hot water on. However, the radiators continued to blaze away. Thought maybe I turned the wrong thing off and turned off the hot water and turned the central heating back on. Same thing, radiators blazing away, however I don't think the water is getting hot. I can understand the radiators blazing away if the thermostat is faulty, but why are they still on when I turn the central heating off. Wonder if there was always a problem with the two systems but it was never a problem when the room thermostat worked?

    It's a standard gas boiler set up with radiators and a megaflo tank in the airing cupboard.

    Any ideas as to what could be wrong and would you expect the thermostat to fix it?

    SC
     
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  3. kidgreen61

    kidgreen61

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    Probably faulty zone/mid position valve
     
  4. oldbutnotdead

    oldbutnotdead

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    Bit more detail needed and some more diagnostic testing from you (eg when you turn heat and hot water off does pump continue to run/boiler fire). Does sound rather like a jammed valve
     
  5. sc29

    sc29

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    Hi
    I think it could be the valve. Just watched a youtube on it.

    Yes when I turn everything off the boiler does shutdown. I think the valve is jammed open on the central heating.

    Big problem now trying to find a local plumber :(
     
  6. Hugh Jaleak

    Hugh Jaleak

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    May be able to change the Valve head over without touching the water side of things. What Manufacturer is the valve and are you competent working with Mains Voltage electricity? Some pics may help.
     
  7. sc29

    sc29

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    Hi Hugh

    Here's some photos. I didn't think I'd be able to replace the entire valve but I could have a go at the motor. Is it likely to be the motor though and not something gone wrong inside the valve?
     

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