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Subject Topic: No flow from Hot tap Post Reply Post New Topic
10/1/2014 at 7:39pm
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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My hot water system seems to have some sort of blockage - the water just stopped flowing from the taps in both sink and bathroom.

Any advice on testing fixing this?

I keep telling myself it will soon be nice enough to get started fixing it...



10/1/2014 at 7:57pm
 Location: Midlands
 Outfit: Mondeo Avondale Gram
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Have you filled the heater with water? Mine takes approx 9 litres for the heater + another litre for the pipes before water will flow from the taps.

Any noise? Can you hear the pump?

Refitted the drain plug?



10/1/2014 at 10:35pm
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Hi,

It was all filled and working over most of a fortnight in Scotland - during which the car nearly died and I had to have emergency dental treatment for an abcess. In some ways the hot water was the least of it :)

However it just suddenly went to a trickle, system full, pump running...



11/1/2014 at 6:37am
 Location: 
 Outfit: 
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Switch off the system and take out the drain plug.Note how much water comes out.Start system with drain plug out you should have a "Gushing"flow,if not it sounds as if the non return valve to the heater has jammed.
The valve is located just before the heater and will need replacing.

-------------
Animals have feelings..

JEFF................


11/1/2014 at 9:35am
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Cheers... soon as it gets a bit drier (I live on edge of Somerset Levels) and warmer I'll get out there!

Soon be Spring!

 

Steve



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19/1/2014 at 2:44am
 Location: Lancashire
 Outfit: Caravan now Sold
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the non return valve has failed and needs replacing asap. when this happens no cold water is getting into the hot tank so do not switch on. to test remove the drain plug outside, if water is gushing out when the pump is activated then it the NRV is ok. if it only trickles out then it is blocked or stuck in position. try gently pushing a 10 inch water colour brush into the drain hole handle first with the pump running, you will know if you freed off as water will gush out when free. cured mine. failing this contact gary about replacing it.

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the only silly question is the one you do not ask.


19/1/2014 at 6:10pm
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Cheers mate, I am going to get stuck in once weather permits and will try what you suggest.

BTW... who is gary?



22/1/2014 at 11:11pm
 Location: Lancashire
 Outfit: Caravan now Sold
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http://www.arcsystems.biz/

-------------
the only silly question is the one you do not ask.


22/1/2014 at 11:22pm
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Cheers mate, usful site


02/2/2014 at 3:16am
 Location: Lancashire
 Outfit: Caravan now Sold
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did you mend it?

-------------
the only silly question is the one you do not ask.


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02/2/2014 at 9:41am
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Not yet mate - too soggy on storage site to get at it... I live in Somerset... thankfully a bit higher than the Levels. I'll get at it once I can get it over to home, probably a few weeks. Thanks though, I'll let you know how I get on!


22/4/2014 at 11:54pm
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Sigh... got another valve and removed old one which broke off in heater body. Had to make saw cuts in it then lever bits out and clean threads with limescale remover and a toothbrush.

Fitted new one now kitchen tap still a trickle, bathroom tap good flow but water not heating up and heater fault light coming on after turn bathroom tap off.

Old one was just an empty tube, new one has ball in end so old one must have lost ball? Gone inside heater and blocked something?

Any more suggestions Michael or anyone else... I am desperate to fix as may be selling it to upgrade - got sight of a bargain.



28/4/2014 at 8:24am
 Location: Sussex
 Outfit: 2007 Eriba Triton 430GT
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Torsteve, are you sure you replaced the right hose connector? If yours is a carver cascade bolier, the NRV is situated at the bottom with a cold water hose connection. The top hose connection is straight through and connected to the hot water hose.


28/4/2014 at 10:05am
 Location: Glastonbury
 Outfit: 1994 Swift Challenger 550 SE
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Yeah - that's the one I changed! I have given up and booked a repair much as it grieves me not to solve it myself but I need to be able to use it soon.

Thanks everyone for suggestions



29/4/2014 at 10:29pm
 Location: None Entered
 Outfit: http: www.arcsystems.biz
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As far as I read it you did not test for flow out of the drain, but now it should gush out when the pumps on?

If so, then next is to put the drain bung back in and after removing the plastic flue cover outside, remove the   nut from the quick drain valve, (QDV), top left above the drain bung.

If plenty of water is getting into the heater then water should gush from this open end at the top of the heater, if it does then the blockage is in the pipework to the taps and as it's both taps, before the pipework splits off to either tap.

If not though and it only trickles out if at all, then the narrow drilling from drain bung hole up into the heater is blocked.

If this is the case, a simple way to remove what will be bits of limescale that have congealed into a lump, is the roughly connect a hosepipe using electrical tape to built up the hose diameter. Now hold it reasonably tight in the bung hole but not fully sealed so allow the swirling water from the hose to nibble away at the blockage and clear it.

Important here to leave the QDV open so air can get out so not restricting water getting in nor over pressurising the tank



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