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  1. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    From operating manual I miss read it says operating flow temp is set up to 75c. So makes sense max standard flow temp - 75c Safety cut off must be at 80c
  2. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    I see . I know that's the flow temp in the boiler. As discussed - factory temp is 75c Mine had been reaching 80c and shutting down Now sits at 70 c when tap is on
  3. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Where did I say it was the hot water temp , I've never measured the hot water temperature
  4. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Just tested the tap... Strongest tap in the kitchen Pump on 8.6 litre per min Pump off 6.8 litre per min I presume without pump would be slightly higher than pump off.
  5. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Temperature is the flow temperature on combi gauge - factory is 75 c Pump makes realistic no difference to flow when it switched on or off . I know it's expensive . I won't be paying for it. He can remove it if he likes I obviously will pay him for time he spent of changing some fixings. Im...
  6. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Ran half a bath seems to be fine. Temp sticks between 68 - 73c. I think the basis of thought was that there may have been a issue with water pressure http://www.salamanderpumps.co.uk/pumps/home-boost/ I asked him to check the exchanger / condition of water etc and try and find the issue. He...
  7. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    No I didn't pay him , and i don't think he will ask for money . At the time he came round the hot water worked for taps and shower. But as soon as he ran the bath it would heat up the water and the boiler would shut down. Think he was abit stumped to what the issue was. - i still haven't...
  8. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    I'm sure nothing I have done has actually rectified the problem - it's just by chance . I predict in a few days the issue will return and I will try a different GS engineer
  9. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    BG - changed the diverter valve due to leak. Next day hot water reached 80 then boiler shut down and water went cold . Had to turn the tap off then back on to get a burst of hot water BG - came back said heat exchanger needed changing and a power flush Since the boiler and all the rads and...
  10. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Standard forum replies If the above is wrong and not how you would do it simply say so. The boiler is serviced regularly by a GS engineer.
  11. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Yea just lime scale build up Hopefully not I just wanted to confirm - turn power off - turn off incoming water - run hot water taps till dry - drain off primaries - remove 4 screw / exchanger - replace with new exchanger with new washers and a bit of silicone grease Jon done
  12. H

    Vaillant 831 plus plate heat exchanger replacement - how to?

    Have a vaillant ecotec plus 831 Could someone right up a quick how to. E.g.: >turn off cold water > turn off boiler > run hot water taps ........ Please see pictures attached for reference
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