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Help boiler heating water but not radiators (freezing house)

Discussion in 'Plumbing and Central Heating' started by grantwilson, 16 Feb 2011.

  1. grantwilson

    grantwilson

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    Location:
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    Country:
    United Kingdom
    Hi just wondered if anyone can pass on some advise please

    my setup is as follows:

    3 storey house (barrett type)

    Potterton Suprema l40 Boiler (upgraded PCB)
    Potterton Ep2002 programmer
    Potterton T40 thermostat
    Santon premier plus tank

    My problem is my boiler is heating up my water no problem, but it doesnt seem to want to heat up our radiators

    now with my little knowledge on boilers i have carried out a few tests,

    1, use some hot water up, tank communicates with boiler and the boiler fires up fine a warms fresh water up in tank no problems

    2, i have turned my thermostat up to 30 deg put a bag of frozen peas over thermostat for about 2 mins and no response from boiler

    3, have tried to reset boiler but still nothing

    4, i have a seperate channel on my system which runs out to my koi pond (indoor) this is controlled by its own thermostat but is only used to stop water going a really low temp so isnt used much, as a test i set my desired temp to 12 deg, koi thermostat is reading at 8 deg and is set to warm up when the temp drops 0.5 deg below the desired temp, a few seconds later boiler fires up and starts to warm up my channel going to koi pond

    So from this my conclusion is the boiler is working fine, but seems to me my room thermostat is no working or a pump or valve is not working which releases hot water around the radiator system, but my feeling is its the termostat as even when set at 30 deg and the house is freezing the boiler isnt even attempting to fire up

    One other thing that maybe something or not, in the cupboard with the hot water tank there seems to be a valve that is working but is making a loud noise, vibrating!! im unsure what this valve is for but it is a Myson power extra MPE222

    Any help would be great thanks
     
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  3. combispecialist

    combispecialist

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    its ure motorised valve faulty in airing cupboard,im pretty sure u can get the valve heads for those potterton ones,either replace the head (straight forward just unscrew the 2 screws and it comes off.failing that just but a complete honeywell 3 port valve,drain system and fit valve :)
     
  4. lukewarmsue

    lukewarmsue

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    Hi, its the divetor valve, costs approx £98, ours went on boxing day !!!!! and we had the same probs you are having but now we are nice and cosy
     
  5. picasso

    picasso

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    The valve the op quotes is a 2 port valve ...so no divertor valve unless there is a 3 port he isint telling us about.
     
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  7. grantwilson

    grantwilson

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    Hi i cant see a three port valve looks more like a 2 port valve

    cheers

    grant
     
  8. grantwilson

    grantwilson

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  9. picasso

    picasso

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    As already said change the head on the myson, no need to drain down, it sounds like its on its last legs anyway.
     
  10. grantwilson

    grantwilson

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    Nice one thanks for the quick replys everyone
     
  11. DIYnot Local

    DIYnot Local

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