Why can't I keep water in the tank ?

Discussion in 'The Beginner' started by BusyBuilder, Feb 7, 2016.

  1. BusyBuilder

    BusyBuilder Funster

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    Right, I've put fresh water in the tank, and when I switch on the 12v system water pours out from under the van, I've closed the tap at the boiler and the tap on the tank. The temp outside is about 4 deg C

    No water does come out if 12v not switched on, only if on.

    No matter how much water we put in the van it won't stay in, is it because the outside temp is too low ?? if so how do we keep water in the van in cold weather ?

    It's a Hymer Tramp 552 so 'winterised' whatever that means.

    We wanted to go out today but until we resolve the water issue we can't.
     
  2. tonka

    tonka Funster Life Member

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    Sounds like a leak, split pipe etc..
    The pump will give it pressure and maybe at that point it get pushed out.
    Some Truma boilers have a "dump valve" that operate and prevent the boiler from freezing.. I'm not familiar with Hymers or this dump issue.. Sure someone will be along with more info soon..
     
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  3. John Laidler

    John Laidler Funster

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    Our MH water heater has a dump valve which ditches the water if the temperature gets down to 4C and it is switched off - it is frost protection. This could be the problem, wait until it gets warmer and see if the problem goes away. However, these valves can get stuck open due to lime scale. If this is the case descaling might cure it.
     
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  4. Stroppy Bird

    Stroppy Bird Funster

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    Hi - I'm unfamiliar with your van so don't know which boiler you have.

    On my boiler the auto frost protection needs the tap closing and a little button pushing in as well. If it's cold around this area you might need to warm the van first to stop it reactivating.
     
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  5. GJH

    GJH Funster Life Member

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    Our Burstner has both the (red) automatic dump valve and (yellow) manual dump valve. Both must be closed to prevent water emptying from the boiler.
     
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  6. JeanLuc

    JeanLuc Funster

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    In order for water to flow only when the 12v system is switched on suggests that power supply is activation the pump and that a trap is open somewhere. The pump is activated by the taps on the sink and the shower which operate a micro-switch when the tap lever is pulled up. Are your taps firmly closed? The likely vent from which the water is flowing is the frost protection valve (FPV) for the Truma. You probably have a C3004 Truma and the frost valve is normally next to it. It looks like the item on the left of the picture below. This opens when the temperature falls to around 4°C and cannot be reset until the temperature is around 7-8°C. The red button clicks into the closed position by pulling it up and falls to the open position when the temperature drops. Either start the Truma and warm it up first, or hold the red button on the FPV closed until the van is warm (in the up position). This can be done with a peg, but do not forget to remove it once the van is warm.
    [​IMG]

    p.s. it would help to know what year your Tramp was made since versions of fittings changed over the model's production life. Also, is this a new problem or has it happened before - is the van new to you?
     
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  7. Shrimp64

    Shrimp64 Funster

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    We have a 'dump valve' on our Hymer. We keep a peg on it to stop it operating, but you must remember it's there!
    You should check first to make sure everything is in order with all the valves/mechanisms etc!
     
  8. Rapido925M

    Rapido925M Funster

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    After the winter I ALWAYS need to switch the boiler on with gas for 10mins to ensure the auto dump valve will stay closed - Gordon
     
  9. WillH

    WillH Funster

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    If it isn't the dump valve you've got a leak!
     
  10. teensvan99

    teensvan99 Funster

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    If you have the system that the taps have a micro switch in them and when you turn on 12 volt water runs out it would seem you have a split pipe. Did you drain down the water system before it got cold. The pipes can freeze very easily in winter. We drain the water in our van mid November and use it as a dry van during the winter and don't refill until Mid March. Just use 5ltr bottles in the van for short trips in winter. Only leave water in the whole system if you live in it all winter like we used to do.
     
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  11. OldWomble

    OldWomble Funster

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    If you don't know where the dump valve is, put water in the tank and have a look under the van to see where it's coming out. The dump valve will be directly Obote the outlet. It's probably a blue plastic valve with a tap on the top you turn and a button on the side you press in to reset it.n good luck!
     
  12. Lenny HB

    Lenny HB Funster

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    If it is not the dump, more likley to be the vent valve if it is a Truma Combi, at the top of the boiler where the hot water take off is there is a red "T" with a built in vent valve, you will have 2 pipes attached to it, one is the hot water feed the other is a clear vent tube which goes out under the floor. Tempory fix is to clamp off the vent pipe.

    Truma vent elbow
     
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  13. BusyBuilder

    BusyBuilder Funster

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    Thanks for all your replies, the van is 2009 model, the water is coming out of a small bore pipe under the van, there appear to be two of these about 15mm diameter.
    The only valve I can see by the Truma boiler is a tall black jobbie with a blue 'T' handle on top which turns and has a button at the bottom. I have turned this to 90deg to pipe and pushed in button.

    I have closed the taps and the motor stops in the tank. I don't think it's a split pipe or a leak.

    I'll have another go tomorrow.
     
  14. movan

    movan Funster Life Member

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  15. BusyBuilder

    BusyBuilder Funster

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  16. movan

    movan Funster Life Member

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    Hi Busybuilder... sorry this may be stupid as my own system is slightly different. . but you say you have 'pushed the button in'. If I push the button IN then that empties the water in my system .. hence the need for a peg to keep the button OUT... As I say, sorry if this silly answer ... I don't know your system.
     
  17. GJH

    GJH Funster Life Member

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    I think that's the correct procedure with that valve. Somebody will soon be along if it isn't :)
    Different system in your van and ours Joy :)
     
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  18. Lenny HB

    Lenny HB Funster

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    As you have closed the dump valve, as I said in my earlier post (post#12) it is probably the vent valve on the hot water take off, it's a common problem.
     
  19. BusyBuilder

    BusyBuilder Funster

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    Thanks Lenny, I'll have another look tomorrow, the timber shelf (under the bed) on the top of the boiler is shielding it from view, if it is that I'll order another thanks for the link.
     
  20. BusyBuilder

    BusyBuilder Funster

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    Okay had another go today, put water in tank, water stayed put till I switched on a tap (sink) then the water is trying to come out of the tap but water is also coming out of a pipe under the van. There are 3 pipes in this area but I can only see one from inside the van....and I've looked everywhere but these 3 pipes are within an 2" of each other.

    I removed the red valve (Truma vent elbow) from the boiler and turned on a tap, water came out under the van but not from the red valve.

    So water drains from a pipe under the van but not from the 'red' valve and the dump valve makes no difference either. I tried the tank drain valve as well but the water drains from a totally different area under the van so not that.

    I'm stumped, if I could only see the 3 pipes inside the van I could see where the water is coming from. The inside of the van is totally dry.
    Outside temp today is around 9 degC.
     
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