Harry136 Posted February 20, 2020 Report Share Posted February 20, 2020 Hi, In our house we have a Vokera Vision 30c combi boiler, the pressure needs topping up every couple of weeks. Obviousley we have a leak somewhere, the weird thing is, throughout summer, the boiler retains its pressure! Any ideas what could be going on and what i could do to solve it? There is no sign of any leaks anywhere! Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted February 20, 2020 Report Share Posted February 20, 2020 The boiler is doing far less work through the warmer months. Quote Link to comment Share on other sites More sharing options...
Ian willetts Posted February 20, 2020 Report Share Posted February 20, 2020 Is it a condensed boiler if it is mine needs topping up now and again I am no plumber but I put it down to usage what with central heating and hot water more than you will use said boiler in the warmer months hope this helps Quote Link to comment Share on other sites More sharing options...
Harry136 Posted February 20, 2020 Author Report Share Posted February 20, 2020 One idea i have had is that it has developed a leak due to metal contraction due to the cold weather, don't know if thats possible though! Quote Link to comment Share on other sites More sharing options...
aga man Posted February 20, 2020 Report Share Posted February 20, 2020 Expansion vessel needs re charging or replacing by the sounds of it. The pressure relief valve is probable discharging the water outside. Quote Link to comment Share on other sites More sharing options...
Doc Holliday Posted February 20, 2020 Report Share Posted February 20, 2020 There are 3 reasons why a combi boiler will loose pressure. The expansion vessel air charge is depleted. This happens naturally and is easily checked and amended, or it could be that the diaphragm has ruptured (tell tale sign is water fro mthe air valve). The pressure relief is letting by - Check outside to see if it is continually dripping. You have a leak on the system somewhere. it's not easy to find especially if you have pipe running under solid floors. I would check and eliminate the first 2 before you look at this option. Hope that helps. Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted February 20, 2020 Report Share Posted February 20, 2020 hello, have you looked at overflow pipe outside ? dripping ?? Quote Link to comment Share on other sites More sharing options...
Lord Geordie Posted February 20, 2020 Report Share Posted February 20, 2020 I made the mistake of topping up with water every time the pressure dropped, putting it down to a leak! It WAS a leak, but not a water one! I noticed one day the pressure guage went into the red when the heating was on! Dropped the water via the full valve and re pressured the expansion vessel using a bike pump. Now I have replaced the shrader valve and it’s perfect! Quote Link to comment Share on other sites More sharing options...
Blackpowder Posted February 20, 2020 Report Share Posted February 20, 2020 Pressure relief valve Pressure vessel Underfloor leak. Could be either, first two are the easiest to investigate. Blackpowder Quote Link to comment Share on other sites More sharing options...
Westley Posted February 20, 2020 Report Share Posted February 20, 2020 I had a similar problem and suspected the older, original copper piping on the heating system. I drained the towel rail in the bathroom, added some Fernox leak sealer, then refilled the system. That sorted the problem. I shall now await the bombardment from heating engineers telling me how my system will soon be blocked up and it will need the entire thing ripping out and starting again. A bit like British Gas telling people, especially the elderly, that their boiler needs replacing, which, of course has nothing to do with the commission they will get, if the job goes ahead ! Quote Link to comment Share on other sites More sharing options...
B725 Posted February 20, 2020 Report Share Posted February 20, 2020 Not from me, Fernox or Sentinal internal leak sealer can help seal the tiniest of leaks that are hard to find I've used it a few times Quote Link to comment Share on other sites More sharing options...
Westley Posted February 20, 2020 Report Share Posted February 20, 2020 46 minutes ago, B725 said: Not from me, Fernox or Sentinal internal leak sealer can help seal the tiniest of leaks that are hard to find I've used it a few times I also used it on my Daughters heated towel rail that developed a drip from one of the tube welds (a month out of warranty). Stuck the Fernox in, topped up water, left towel rail off for a day and turned it back on. Two years later and it is still going strong ! 1 hour ago, Harry136 said: Hi, In our house we have a Vokera Vision 30c combi boiler, the pressure needs topping up every couple of weeks. Obviousley we have a leak somewhere, the weird thing is, throughout summer, the boiler retains its pressure! Any ideas what could be going on and what i could do to solve it? There is no sign of any leaks anywhere! Possibly it is a heat expansion leak on the heating pipes/radiators, which do not get used much in the Summer ? My leak was. Quote Link to comment Share on other sites More sharing options...
The Heron Posted February 20, 2020 Report Share Posted February 20, 2020 2 hours ago, aga man said: Expansion vessel needs re charging or replacing by the sounds of it. The pressure relief valve is probable discharging the water outside. +1 it will get worse Quote Link to comment Share on other sites More sharing options...
Harry136 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Unfortunately I can’t see the outlet pipe as it has been plumbed into the guttering. Would it be same for me to remove the case of the boiler to see if it’s been leaking inside? Quote Link to comment Share on other sites More sharing options...
JohnfromUK Posted February 21, 2020 Report Share Posted February 21, 2020 6 hours ago, Harry136 said: Unfortunately I can’t see the outlet pipe as it has been plumbed into the guttering. Would it be same for me to remove the case of the boiler to see if it’s been leaking inside? Could you temporarily slip a bit of hose or plastic tube over the expansion outlet just while you see what is going on? I doubt you can see from the inside. Quote Link to comment Share on other sites More sharing options...
Jaymo Posted February 21, 2020 Report Share Posted February 21, 2020 It’s a Vokera, bound to leak 🙂 From experience - heat exchanger or if it is not always demanding hot water, then the diaphragm. Good luck Quote Link to comment Share on other sites More sharing options...
B725 Posted February 21, 2020 Report Share Posted February 21, 2020 8 hours ago, Harry136 said: Unfortunately I can’t see the outlet pipe as it has been plumbed into the guttering. Would it be same for me to remove the case of the boiler to see if it’s been leaking inside? It's bad practice to put the outlet into the gutter it should be visible at all times so you can see any water being wasted also if it lifted at a high temperature it could damage the plastic gutter. Quote Link to comment Share on other sites More sharing options...
Mighty Ruler Posted February 21, 2020 Report Share Posted February 21, 2020 I had this on 2 Baxi combi boilers I have, it was the pressure vessel in both cases. Quote Link to comment Share on other sites More sharing options...
Harry136 Posted March 1, 2020 Author Report Share Posted March 1, 2020 Quick update, I have removed the piping, it is dripping outside when being used, either when showering or when the central heating is on. I need to call a heating engineer I think! Quote Link to comment Share on other sites More sharing options...
washerboy Posted March 1, 2020 Report Share Posted March 1, 2020 Mine was the same I had the boiler cleaned, pipework flush out. I was told only Friday that most combi boilers needed top up anyway, more so in winter. Mine needed doing every 10 days, sometimes less until I had it cleaned last summer and it went from May until December before it dropped pressure. Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted March 1, 2020 Report Share Posted March 1, 2020 hello, if it is just loosing a bit of water out the over flow and needs a top up every so often i would try some sealant before you get a heating engineer, its not expensive to try first, just drain a bit of water off the radiator that has the out flow valve and once below the brass air plug (leave bleed nipple in) take it out pour the sealant in replace brass plug and top up water, start boiler and let the pump work till rad hot, switch off boiler let rad water settle, top up if needed and see if leak stops, you can get a decent sealer for a tenner, Quote Link to comment Share on other sites More sharing options...
Harry136 Posted March 1, 2020 Author Report Share Posted March 1, 2020 I have to top up the boiler every other day Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted March 2, 2020 Report Share Posted March 2, 2020 8 hours ago, Harry136 said: I have to top up the boiler every other day hello, ok, looks like a heating engineer required, good luck Quote Link to comment Share on other sites More sharing options...
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