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Combi Boiler - Running warm & then cold!? HELP!

Hi,

I've got a Potterton MAIN COMBI 30HE boiler system.

The problem is it is producing warm(ish) water and then goes cold quite quickly and continues like this whilst running the shower/bath.

The Central heating is running fine and the RAD's are piping hot.

The boiler does fire when the hot tap is on - buts its very annoying when the water is cold... The setting is up as high as it can go for the hot water!?

Can anyone advise?? Thank you in advance!
DG

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  • 3 more comments 
  • willywoodhea Dec 26, 2008

    i have the same problem but when i isolate the cold flow in to the boiler i still get mains pressure at hot tap heat exchanger ok slight drip from diverter valve pushrod but microswitches are working boiler has been in 18 months and been ok

  • Anonymous Mar 13, 2014

    hot water running hot and cold even though tap is on

  • Anonymous Mar 18, 2014

    cannot get hot water

  • Anonymous Mar 25, 2014

    Mechanical Clock Problem

  • Anonymous Mar 26, 2014

    A 8LT WATER BOILER/TEA /URN.

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Mixing valve must be replaced

Posted on Nov 02, 2008

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The problem was solved on my system by replacing thermostatic valve on shower and putting non return valves on hot and cold feed to shower . the problem was caused by cold water getting into the hot water line through the shower hope this helps

Posted on Dec 30, 2008

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