Potterton Myson Prima F40 needs hot water tap turned on...

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  • johnna
    Automated Home Jr Member
    • Oct 2006
    • 20

    Potterton Myson Prima F40 needs hot water tap turned on...

    As the thread title suggests:

    My Potterton Myson Prima F40 needs one of the hot water taps turned on before the pilot light kicks in. The boiler controls the central heating and water.

    Once the tap has been running, the heating kicks in for a good ten minutes/ quarter of an hour.

    What causes this? How can I best over come it? I did think that I had adequately bled the system after fitting a new downstairs radiator.

    Please help!
    I resemble that accusation...
  • sunbeam
    Moderator
    • Feb 2006
    • 261

    #2
    Re: Potterton Myson Prima F40 needs hot water tap turned on.

    do you have a 3 way valve somewhere(cylinder cupboard maybe)

    could be sticking.

    Comment

    • johnna
      Automated Home Jr Member
      • Oct 2006
      • 20

      #3
      Re: Potterton Myson Prima F40 needs hot water tap turned on.

      I may well have a three-way valve...

      What does it look like?
      I resemble that accusation...

      Comment

      • johnna
        Automated Home Jr Member
        • Oct 2006
        • 20

        #4
        I think I found it...

        It has a manual over-ride which allows the heating to heat.
        Is it a remove and replace jobbie, or can I strip it and recon it?

        I've rebuilt engines, so I'm not a total numpty!
        I resemble that accusation...

        Comment

        • sunbeam
          Moderator
          • Feb 2006
          • 261

          #5
          Re: Potterton Myson Prima F40 needs hot water tap turned on.

          can you see any make ?

          if it's a honywell you can get a new motor, easy to fit and about a tenner,

          but i'd go for replacing the whole unit, "tower" are the cheapest.

          Comment

          • johnna
            Automated Home Jr Member
            • Oct 2006
            • 20

            #6
            Re: Potterton Myson Prima F40 needs hot water tap turned on.

            Hi Sunbeam,
            It's a potterton item, please excuse the huge and blurry pics...





            Can it be stripped and repaired?
            I resemble that accusation...

            Comment

            • sunbeam
              Moderator
              • Feb 2006
              • 261

              #7
              Re: Potterton Myson Prima F40 needs hot water tap turned on.

              take off the top and see if you can determine wether the motor is rivited on, if not bingo moterised valves all use the same motors, but some are rivited (new valve)

              Comment

              • johnna
                Automated Home Jr Member
                • Oct 2006
                • 20

                #8
                Re: Potterton Myson Prima F40 needs hot water tap turned on.

                Will strip it tomorrow. Cheers!

                So I look to see if it is rivetted. Then I can remove the motor if it isn't. If it is then I by a replacement. Is that right?
                I resemble that accusation...

                Comment

                • sunbeam
                  Moderator
                  • Feb 2006
                  • 261

                  #9
                  Re: Potterton Myson Prima F40 needs hot water tap turned on.

                  that's it johnna

                  turn the central heating isolater off (240 v)

                  Comment

                  • johnna
                    Automated Home Jr Member
                    • Oct 2006
                    • 20

                    #10
                    I have removed the top and the motor can be accessed by removing the tamper proof screws. But I noticed some corrosion around the spigot (my word!), so I cleaned it up and wd-40'd it.

                    We'll see how it holds up.
                    I resemble that accusation...

                    Comment

                    • johnna
                      Automated Home Jr Member
                      • Oct 2006
                      • 20

                      #11
                      Nah! It's knackered!

                      The valve itself leaks ever so slightly, this has caused corrosion on the base plate and to the motor mech. Oh bugger! Plumbing for me tomorrow...
                      I resemble that accusation...

                      Comment

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