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Subject Topic: loosing pressure
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29/9/2013 at 6:44pm
 Location: south yorks
 Outfit: None Entered
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My water system does not seem to be holding pressure, when I turn on the 12v supply the pump kicks in and seems to take an age to come up to pressure and then knock off. Also the pump will start for a couple of seconds every few hours on it's own to top up the pressure.   I cannot find any leaks or dripping taps so I wonder if this may be a sign of imminent pump failure.

Any thoughts on this please

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josiewales


29/9/2013 at 7:20pm
 Location: Liverpool
 Outfit: IH TIO R
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You either have air entering the system or you definitely have a slight leakage somewhere that you have not detected.

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wineciccio


30/9/2013 at 10:05am
 Location: Shropshire
 Outfit: None Entered
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No idea what unit/water system type you have but it's also worth checking the boiler drain valve....

Ours went through a spell where it'd "shunt" and  "re-pressurize" itself every few minutes.. and opening and closing the drain valve umpteen times cured it(..I assume it just wasn't "seating" properly".).

If that doesn't do it,there must be a one way valve of some description..so it could also be draining back through that?...

Although, if yours is only "re-priming" once every "few hours",assuming that there are no leaks, then I'm not sure whether or not that would just be deemed an acceptable level of "seep back" anyway?

(..and if there were a leak, it'd have to be a very small one, for it to "re-prime" so infrequently).

Having said that, if the pump seems to be taking ages to build the pressure in the first place, it may well be a fault with the pump?..and it could be draining/seeping back through it?...it may be worth checking if there's a service kit is available for it?

We only turn our pump on during periods when we'll be using it(cooking/washing),so ours isn't just left on for hours at a time...



Post last edited on 30/09/2013 10:19:08


30/9/2013 at 7:36pm
 Location: south yorks
 Outfit: None Entered
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Thanks! I hadn't thought of the boiler drain valve, it is only one of those flip up things and may well be the problem. I will check it tomorrow.
The pump is only 3 years old and when the old one went it emptied the tank onto the floor (well almost until I cut the power) so now the pump is only on when we are in the van but not through the night
The long priming time is only when not in use for a couple of days but to go from zero to 6 minutes is a change that I think needs investigation (if only to stop the OH diving for the power switch when re priming)

Thanks again I am fairly confident about the boiler drain

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josiewales


01/10/2013 at 9:37am
 Location: Shropshire
 Outfit: None Entered
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I hope it does just turn out to be the boiler drain...and it wouldn't have to be seeping much.

Maybe place a newspaper, held down with a couple of bricks, under where it exits.That way, it'd clearly show if it's leaking or not.

We've got one of the stupid anti frost/auto dump drain valves on our current van....which unless held closed by an R clip, will automatically drain the boiler if the temp falls below 5C (ish) 



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01/10/2013 at 7:33pm
 Location: south yorks
 Outfit: None Entered
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   Had a fiddle with the valve this morning before I went to work and then drained and refilled the boiler.
The valve feels very flimsy so may consider changing it anyway.
OH has been in the van cleaning most of the day and says it didn't re prime once

so heres hoping

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josiewales


01/10/2013 at 7:58pm
 Location: DURHAM
 Outfit: Mondeo TItanium 140 Avondale Mayfly 25
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Possible faulty non return valve letting pressure back to supply



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