Water Pump keeps switching on for a split second.

Discussion in 'Tech/Mech General' started by Craig Rogers, May 1, 2012.

  1. Craig Rogers

    Craig Rogers Read Only Funster

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    About every 10 minutes, the water pump keeps switching on for a split second as if the pressure is dropping. I've checked and can't see any water leaks which would make sense. Anybody else got any ideas?

    In case it was just an air lock causing it (maybe?), I've drained the system all down, so it might not do it when I refill, but thought I'd check if anyone knows?
     
  2. Jim

    Jim Ringleader

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    You have a leak.. you just need to find it:Smile:
     
  3. icantremember

    icantremember Funster

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    It certainly sounds like a small leak somewhere or a tap dripping
     
  4. Scotties

    Scotties Funster Life Member

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    Common one is the Thetford solenoid allowing water through, leave 12v on when stood up a couple of weeks and see if you get a full bowl of water. :Eeek:
     
  5. capinpugwash

    capinpugwash Funster

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    I have the same thing and found that the frost release valve for the hot water tank has a slight drip (a weep really).

    Over the course of say 10 minutes the pressure drops enough for the pump to kick in for a second.
     
  6. jhorsf

    jhorsf Read Only Funster

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    Voltage low ? would that cause it?

    pump seals?
     
  7. Loujess

    Loujess Read Only Funster

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    Our leak was under the basin in the bathroom. :BigGrin:

    Ivy
     
  8. Craig Rogers

    Craig Rogers Read Only Funster

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    I've just had a thought.............. I may have nudged the hot water draindown valve whilst we where away, I'm thinking that there may have been a small leak from there..........

    Thanks for your help all.
     
  9. Terry

    Terry Funster

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    Hi Craig the pump seals may be going allowing it to loose pressure :thumb: you can get a kit :thumb: or a new pump :BigGrin::Wink:
    terry
     
  10. Craig Rogers

    Craig Rogers Read Only Funster

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    Cheers all, it's still under warranty and is due a hab check soon, so I think I'll save my effort and get them to do it! :Laughing:
     
  11. Terry

    Terry Funster

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    My monies on the pump seals :thumb: but check everywhere for leaks now,don't leave it to chance or a least turn off the pump :thumb:Wrap all joints and lower parts of any pipes in loo roll then turn pump on,leave until you are primed a couple of times then check the loo paper :Wink:if all dry it is the pump.
    terry
     
  12. Craig Rogers

    Craig Rogers Read Only Funster

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    It's currently sitting empty at the moment, but I have my suspicions on the draindown valve being slightly open.

    However, it's bugging me that I don't know, so may have to put a small fill in and watch.

    I assume by "pump seals" you mean the seals on the feed, output and filter?
     
  13. Ralph-n-Bev

    Ralph-n-Bev Funster

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    We had exactly the same problem.
    Ours was the outside shower hose attachment. We hunted high and low inside the motorhome .
    We only found it when an icicle had formed out side. Luckily it was well below freezing at the time. Or we could still be looking for it.
     
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  14. spannermanwigan

    spannermanwigan Read Only Funster

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    HERES A TIP

    Too protect the drain down valve from being accidentally operated
    I cover mine with a plastic aerosol can cap,with a slot cut in opposite
    sides to allow it to sit over pipes, cheap and effective.
    Allows you to store stuff around the valve without fear of operating it.

    regards

    Steve:thumb::BigGrin:
     
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  15. jonandshell

    jonandshell Funster

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    We once lost a whole tankful of water when a toolbox knocked against our boiler drain valve in our old Elddis!
    We arrived at a wild camping spot dry!

    It might be a sliver of limescale jammed in your valve Craig.
     
  16. ericonabike

    ericonabike Read Only Funster

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    Just to hijack this thread...

    ...very slightly. We have had the occasional 'jug/chug/jug' noise in our new to us motorhome since we bought it. Thought at first it was the fridge starting up, but now seems more likely it's the water pump. Only happens for a split second, once every few minutes. After reading this thread, seems there may be a leak somewhere? Hadn't actually realised the system is pressurised...

    I've still got two months left of the six month warranty, but would like to be certain what I'm saying before getting back to the dealers. Are there any simple tests I can do to pin the cause and problem down?
     
  17. rangitira

    rangitira Funster

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    Spect this is the reason take a look underneath:thumb:
     
  18. Craig Rogers

    Craig Rogers Read Only Funster

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    I think it maybe the drain valve. I filled and checked all pump joints and pipe joints and they are all dry but the pump continues to prime every 10 or so mins.

    Another thing I've noticed is that the bathroom tap doesn't have a lot of hot pressure but find think its related.
     
  19. Terry

    Terry Funster

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    Do as I said in previous post and check for leaks :thumb:IF NO leaks then the only thing left is the pump seals :thumb::Doh::BigGrin:
    terry
     
  20. Craig Rogers

    Craig Rogers Read Only Funster

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    Well, getting closer.

    After the pump being off all night and all day, I turned it on and it primed, then about 2 mins later it kicked in for a second and then again about 4 mins later.

    Checked all the joints and there is no water leak anywhere, so I removed the pump and found the following on the body that looks like there may have been some water coming out at some point;

    [​IMG]

    [​IMG]

    So I stripped it all down and the diaphram is a little gunked up so thought I'd get all the rubber out and replace, but when I checked, it's far cheaper to just buy a new pump at around £40.

    So, I'm cleaning all the seals up and rebuilding to see if it works first before splashing out.

    If anyone is interested in what a diaphram pump stripped down looks like (the seals are shown bottom right);

    [​IMG]

    It's going in for a Cab service on Friday, so might not get around to refitting it until the weekend, but I'll let you know.
     
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