Overflow/drainage pipe leaking. (1 Viewer)

Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
Hymer B584/2001 model.
Hi All,
I've just noticed a pipe dropping water every 3 seconds, just in from the rear, near side, back wheel. I discovered it this morning and hoped it was condensate from the boiler but it's been leaking all day.
The pipe is under the boiler hence the assumption, there is no leakage visible anywhere in the habitation. Any ideas what this is?
 

old-mo

Funster
Extra Special
LIFE MEMBER
Oct 16, 2008
16,314
92,335
Weymouth. Dorset...
Funster No
4,470
MH
Nearly aint got one.
Exp
Caravan & motorhome 45 + yrs
Sit in the van for a while with the pump turned on... and all the taps off...

If the pump flies into action every now and then possibly a leak from the boiler..

But more likely as @two says maybe a bit of crud/grit hooked up in the dump valve...

Even if it was that the pump should still start up now and then.

Not the defrost pipe from your fridge/freezer.... is it..???

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stephsol
Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
Thanks guys, great info, will have a dig about and find this v/v tomorrow thanks,
The faucet....it would appear I have to do it in situ? Very tight, but I'm in Spain until end of march, so have some time to think it through, I've fount a new tap at £125 delivered, bit expensive so need to get my head around working in such a confined space.??? Don't want to break anything!
 
Nov 4, 2011
5,683
38,883
Uk
Funster No
18,763
MH
A class
Exp
2001
If you lift the bottom of the wardrobe you will see the boiler and this valve is on the right of the boiler.
 
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stephsol
Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
I see the v/v looks straight forward to change, how much water can I expect to come out? And I noticed it stopped leaking for a while, does it just empty the boiler? Or the fresh water tank?
 
Feb 22, 2011
9,130
17,803
Newcastle under Lyme
Funster No
15,397
MH
Hymer B544 A Class
Exp
Since 2015
When the frost protection valve triggers it just empties the boiler, so I think removing to replace the valve would just empty the boiler as well.
 
Nov 4, 2011
5,683
38,883
Uk
Funster No
18,763
MH
A class
Exp
2001
I think to change the pressure relief valve, if you turn the 12 volt of and open the hot tap it will empty the boiler and you can change the valve.

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stephsol
Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
Thanks that makes sense. I also discovered a peg on what I assume is the dump v/v situated bottom left of boiler (see photo) I remember the previous owner saying this was something to do with frost?
I pressed the button and it started draining the boiler. Would it be an idea to cycle the v/v a couple of times to try clear anything hung up on the seat, as previously suggested by two?
 

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Nov 4, 2011
5,683
38,883
Uk
Funster No
18,763
MH
A class
Exp
2001
Thanks that makes sense. I also discovered a peg on what I assume is the dump v/v situated bottom left of boiler (see photo) I remember the previous owner saying this was something to do with frost?
I pressed the button and it started draining the boiler. Would it be an idea to cycle the v/v a couple of times to try clear anything hung up on the seat, as previously suggested by two?

Yes the peg is used to stop the boiler dumping it’s contents but I think they dump at quite a highish temp around 7’c I think.
I’ve got a peg on mine but you do have to be careful if not using the van in very cold conditions.
 

two

Aug 4, 2011
4,805
4,415
West Midlands
Funster No
17,624
MH
A-Class Fiat
Yes, that's your dump valve. I'd guess that it tried to dump but the peg prevented it but not enough to stop a dribble. The idea of the peg is to hold the valve closed while you warm up the van from cold. Don't leave the van unheated in winter with the peg in position.
It will drain the boiler if the temperature falls towards freezing. If you have left the pump on, it will also drain your tank (then burn the pump out). So remove the peg and switch the pump off when not using it in winter.

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stephsol
Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
If I open and close the v/v a couple of times to try clear any debris, manually, I assume I won't cause any damage to the electric/electronic components? And to refill the boiler do I just open a tap on hot until the pump bleeds the water through???
 
Aug 6, 2013
11,841
16,235
Kendal, Cumbria
Funster No
27,352
MH
Le-Voyageur RX958 Pl
Exp
since 1999
If you have left the pump on, it will also drain your tank (then burn the pump out).
It can also drain the water tank if the pump is off. Whether it does so depends on the position of the tank and disposition of the pipework - on some designs it syphons the lot out.

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two

Aug 4, 2011
4,805
4,415
West Midlands
Funster No
17,624
MH
A-Class Fiat
If I open and close the v/v a couple of times to try clear any debris, manually, I assume I won't cause any damage to the electric/electronic components? And to refill the boiler do I just open a tap on hot until the pump bleeds the water through???

You are unlikely to have any debris. It should be clean water.
Opening and closing the valve may encourage it to seat better and seal off any drips.
It will need to be warm (not too chilly) in the vicinity of the valve, though.
Once the valve is closed, turn on the pump and let it force any air in the system out by opening a hot tap. It will take a while if it has to re-fill the boiler.
 
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stephsol
Jul 7, 2016
225
104
Powys, UK
Funster No
43,969
MH
hymer b584
Exp
Im a newgie
Very pleased, dumped the boiler twice and it's ok, it must have been a particle between the seats, so no leak now. Thanks for all your help with this guy's, I'm getting educated bit by bit, the boiler was new territory for me.
Good call "two" and thanks to all for your feedback, great info.
Regards
Steph
 

two

Aug 4, 2011
4,805
4,415
West Midlands
Funster No
17,624
MH
A-Class Fiat
Sometimes they just don't seal. I don't think particles get involved. A bit of 'jiggling' does the trick.
In your case I think the valve had tried to open but was held back by the peg.
Anyways, glad you've sorted it. Happy travels!

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