Recent content by 1APM

Thanks very much for your reply thermo. As there are so many flags involved they believe that to cut out the bed properly will obviously disturb all of the remaining sound flags. Today they have tried an idea which was to lift the flags individually. Clean out the sound bed, pva both the...

Hi, I had an Indian Sandstone patio laid at the start of the year but at the time the weather turned and frost / rain spoilt the pointing. We have raked and cleaned out all of the pointing which was very sandy but noticed that about a third of the flags can be easily lifted from their...

Hi All, Thanks very much for you helpful comments and thoughts. The previous set-up was a dated conventional boiler with an immersion cylinder. When this was upgraded to the combi my installer took great care to delete all of the redundant pipe work from the original install and to and...

Hi Simon, The boiler has been reset to factory defaults but the Aquasensor hasn't been swapped yet! Vaillant were very good and did come out to have a quick look but wouldn't troubleshoot anything on the boiler saying that there would be an external install fault with a dead leg. Three...

Hi Gents, Thanks for the replies. Setting D88 to 1 does hide the problem, but once changed, you have to open any hot tap wide open for ages before the boiler will supply DHW. A setting somewhere in the middle from Vaillant would have been great! On the boiler, if you look at the real time...

Hi, I posted here a few weeks ago, but unfortunately still have the same and ongoing problem. We recently installed a Vaillant 838 combi to replace an aged Gloworm. When almost any appliance / tap or toilet in the house ceases to uses cold water the boiler fires for about 10 seconds to...

Today we have fitted a Zilmet Z160 INOX mini-expansion vessel on the cold feed to the boiler. With the boiler D.88 DHW flow sense value set back at 0 which is the normal setting things are slightly improved however the DHW mode is still called when any cold water flow above a fast trickle is...

I have changed the D.88 set point to 1 and it has indeed “hidden” the problem now with DHW never being called for during a cold-water demand. D.88 was undocumented in the manual that I have so thank you very much for this. This has of course had the knock on effect of considerably...

Hi and thanks, This afternoon we have installed a one way valve just after the DHW outlet and run water without air from every tap and every appliance. Unfortunately this hasn't made any difference to the problem! :( Any other ideas ?

Thanks all for your prompt feedback, We have exposed what we believe to be most of the hot and cold pipework and found nothing as yet. There is one pipe run that we can't easily get to under the recently tiled floor of a bathroom. The services in here haven't been moved since they were...

Firstly many thanks to those who may be able to offer comment and my apologies in advance as a newcomer here, I am not a heating engineer but have tried to detail my experience as best as possible. I have a recently installed Vaillant Exclusive 838. I am generally very happy with the...