Helen M Posted September 21, 2023 Share Posted September 21, 2023 Good afternoon everyone. We have a Hymer Blue Evolution (2021). Whenever we turn on the taps, there is a short delay before water starts to come out from underneath the van. I read through the post from 5 years ago about one of the valves being open and was hopeful. Unfortunately they are all closed. The water is coming out along the nearside of the van. There is a metal gutter with rubber plugs all along the side and the water is coming from there. I have checked the area around the boiler and there is no sign of water leakage from there. Nor from the area by the two drain valves. I have also checked the shower head tap is connected properly and no water is coming from there. When I open the two drain valves water comes from a different place. The same is true when I open the fresh water tank drain. There is no water in the toilet cassette compartment either. Does anyone have any suggestions as to what I can check next? Quote Link to comment Share on other sites More sharing options...
Brian Kirby Posted September 21, 2023 Share Posted September 21, 2023 I am not familiar with this van. However, what your description suggests to me is that the leakage may relate to drainage side, rather than water supply side. I don't know where the waste water tank is installed on your van, but I'm guessing underneath. If that is correct, then the wash basin waste, shower tray drain, and kitchen sink waste, all have to connect onto the main waste water tank. As you seem to be getting the same results from all likely sources, then water leaking from the point/s at which these waste pipes connect onto the waste tank seems a possibility, as does water leaking from the waste water tank drain outlet, particularly where that connects to the tank itself, or even damage to the waste tank that holed it. Quote Link to comment Share on other sites More sharing options...
Helen M Posted September 21, 2023 Author Share Posted September 21, 2023 Thanks Brian. My tank is indeed underneath. Now I need to work out how to get to it. Quote Link to comment Share on other sites More sharing options...
Robinhood Posted September 21, 2023 Share Posted September 21, 2023 On 21/09/2023 at 15:37, Helen M said: Does anyone have any suggestions as to what I can check next? I'm not familiar with the particular Hymer PVC conversion, but I think it has a Truma heater (possibly diesel). You mention checking two valves - are these screw top valves located in the hot and cold pipes?(red and blue traced respectively possibly underfloor - internal, that is). If so, there is most likely an additional, third, drain (automatic, blue, near the heater, and with a "turnbuckle" on the top and button on the side). May be hidden under/behind a flap, but even then it should be easily accessible fro internally. Your description matches the two inline valves I have on my Hymer. If that is so it's worth looking for the boiler dump valve, which may well be open If not, it may be a bit more serious. I'm on a Stellplatz in Germany at the moment. Someone with a better connection might be kind enough to post a picture to help you identify if you have one. Quote Link to comment Share on other sites More sharing options...
colin Posted September 21, 2023 Share Posted September 21, 2023 Let's see if I've got the hang of this new phone. https://youtu.be/PNAoASr4MBI?si=kvZLZeA7YBFhIC0l Quote Link to comment Share on other sites More sharing options...
Robinhood Posted September 21, 2023 Share Posted September 21, 2023 Thanks Colin. If that's been found and checked, then I'm on a wild goose chase. But my Hymer coach-built has both that and two additional inline drains. (The boiler also appears to be mounted nearside and fairly forward from pictures) Quote Link to comment Share on other sites More sharing options...
Thai Bry Posted September 22, 2023 Share Posted September 22, 2023 14 hours ago, Robinhood said: I'm not familiar with the particular Hymer PVC conversion, but I think it has a Truma heater (possibly diesel). You mention checking two valves - are these screw top valves located in the hot and cold pipes?(red and blue traced respectively possibly underfloor - internal, that is). If so, there is most likely an additional, third, drain (automatic, blue, near the heater, and with a "turnbuckle" on the top and button on the side). May be hidden under/behind a flap, but even then it should be easily accessible fro internally. Your description matches the two inline valves I have on my Hymer. If that is so it's worth looking for the boiler dump valve, which may well be open If not, it may be a bit more serious. I'm on a Stellplatz in Germany at the moment. Someone with a better connection might be kind enough to post a picture to help you identify if you have one. We're up on a site in Lochgilphead at the moment. We have had a new Trauma combi 6e boiler installed a couple of years ago on our Hymer 700G We have a manual "Dump valve" rather than an auto drain one. Again this is a little yellow lever near the boiler. In the horizontal/ sideways position, the system is closed, in the upright/vertical position the system is open and drains from the main boiler. As Robin Hood has said, there are also a couple of valves on the "Blue / Cold" line and similar on the red/ hot line. Have you checked these options. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Robinhood Posted September 25, 2023 Share Posted September 25, 2023 Helen, I note you still seem to be logging in, but you haven't confirmed whether you've resolved your problem yet. I have a better internet connection now, and as I still think there's a good chance that the boiler "dump" valve is the source, I'll try to be a bit clearer (reviewing my original, I find it less than exact reading). You mention that you have found two drain valves. Your description leads me to believe that these are the two screw-turn valves in each of the hot and cold pipe runs that vent through the floor. They seem to be a Hymer thing. Mine have a blue screw top to them, and are much as shown here: If these are the only two you've checked, then you need to search for a/the additional boiler dump valve (there will definitely be one) and conventionally it will be close to the boiler (which is on the nearside in your 'van - coincidentally where you think water is escaping). It is odds-on you'll have the type referred to by Colin's link above (a Truma automatic frost valve in black, with a blue turnbuckle switch and reset button). It may be hidden in furniture near the boiler or under a flap in the floor (but should be reasonably accessible as it's a regularly used item). Finding this, and checking that it is closed, is absolutely the first step before anything more drastic. Quote Link to comment Share on other sites More sharing options...
MikeF Posted September 26, 2023 Share Posted September 26, 2023 On 21/09/2023 at 15:37, Helen M said: There is a metal gutter with rubber plugs all along the side and the water is coming from there Since your vehicle is a van based motorhome it sounds as you are describing the van sill, this has many plastic/rubber like plugs. This means the water is flowing inside the van and making it way out via the vehicle sills. I suggest tracing the hot and cold pipe runs and searching for leaks on the near side. As the leak only occurs when the pump is active it must be in the pipework and connections after the pump. Best guess is a failed connector. Since the tank is under the van, the problem won't be there, its inside. Quote Link to comment Share on other sites More sharing options...
AntonFalkenheim Posted August 12 Share Posted August 12 Hi, did you find the source of your leak? We have exactly the same symptoms as you on our Blue evo and have no idea where to start other than all the valves which all seem in the correct place to me? thanks in advance Tony Quote Link to comment Share on other sites More sharing options...
onecal Posted August 13 Share Posted August 13 (edited) Hi Tony What year is your van? Regards Edited August 13 by onecal Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 13 Share Posted August 13 On 12/08/2024 at 22:35, AntonFalkenheim said: Hi, did you find the source of your leak? We have exactly the same symptoms as you on our Blue evo and have no idea where to start other than all the valves which all seem in the correct place to me? thanks in advance Tony Welcome to the Out&AboutLive forums, Tony. Helen M posted twice on this forum on 21 September 2023 and logged on to the forum a week later (28 September 2023). With almost a year having passed with no further forum activity from Helen M (and zero feedback regarding the water leakage) the chances are low that you will receive a reply from her. I don't think it's been mentioned above, but - if the Hymer has a Truma "Combi" combination air-water heater and as turning on taps provoked the water leakage - it's possible that the leakage was from the heater's vent-valve that lets air into the heater during the emptying process but should close once the heater has been filled with water and the water-system pressurised. This behaviour is mentioned here https://www.motorhomefun.co.uk/forum/threads/truma-leaking-hot-water-overflowing.279501/ The vent-valve is on the end of the Combi heater near the top (image below) and if water were being lost through the vent-valve when taps were turned on, this should be apparent by checking whether water is flowing through the clear plastic tube I've arrowed in green. The clear plastic tube should pass through the motothome's floor so that any leaked water drains harmlessly beneath the vehicle, but the tube is quite narrow and may not be immediately visible when the underside of the motorhome is inspected. Helen M said "water starts to come out from underneath the van" but that's much too vague. It really needed someone to get under the motorhome to try to establish exactly the place (or which hose) the water lwas coming from. Quote Link to comment Share on other sites More sharing options...
onecal Posted August 13 Share Posted August 13 Hi Important to know what year your Hymer Blue Evolution is? Yes as Derek has pointed out the vent valves do fail ,I think it may have been a faulty batch ? Some do fail due to debris within but it's not that common on a new van Also you need to check that none of the pipes have split or joints come loose and all waste water piping is intact Regards Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 14 Share Posted August 14 As the Hymer "Free" panel-van-conversion range has only been marketed since 2021, I'm not sure how important knowing the build-year of Tony's would be. The base-vehicle can be a Fiat Ducato or a Mercedes Sprinter, but again I don't think that will matter much in this instance (though it would be nice to know exactly which model Tony owns and its age). Water leaking through the 'aeration/breather/vent' elbow valve fitted to Truma Combi and the preceding Trumatic-C combination air/water heaters has been discussed here every now and again, with it occasionally claimed that, when the elbow valve had been disassembled, the innards had mysteriously disappeared! This 2020 MotorHomeFun thread mentions replacement of the valve. https://www.motorhomefun.co.uk/forum/threads/truma-combi-relief-valve.217303/ Several suggestions were made above regarding Helen M's problem and I've just chucked the vent-valve possibility into the mix. But with no follow-up from Helen and no certainty about where the water leak is leaking out beneath Tony's Hymer, accurate diagnosis isn't really practicable. Quote Link to comment Share on other sites More sharing options...
onecal Posted August 14 Share Posted August 14 Hi Yes it would be nice to know the exact model as it's quite well known for some of the vents to fail and cause water issues. (maybe a faulty batch) If it is the offending drain pipe should be visible outside and not allow water to run into the sill of the vehicle. It may not of course be that simple as that at all as it's almost impossible without actually seeing the van .It could also be damaged pipework or faulty/loose joints or a leaking waste pipe So until both Helen and Tony get back to us of course it's just guesswork Regards Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 14 Share Posted August 14 I think you can forget Helen, but hopefully Tony will be able to provide more information in due course. Quote Link to comment Share on other sites More sharing options...
onecal Posted August 14 Share Posted August 14 Hi Derek It's strange , why so many first time contributors never get back on here with their queries ??? Always nice to know their year of vehicle and maybe some photos pertaining to their query Now one really wonders why this also , nine time of of ten this is not forthcoming ? It hopefully could help many more reading with a similar issue, be of assistance with their own If you are sure "Helen" may not lets hope "Tony" does indeed provide some more information in due course Regards Quote Link to comment Share on other sites More sharing options...
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