Leaking isolator valve- now no hot water??

[krismc]

Hope some one can help, I had a leaky isolator valve on the hot tap below the bath so i drained the hot water and replaced the valve and now i only get a very small amount of hot water from any tap before the water stops and i have to wait ages for more water.

Ive got a condensing boiler down stairs and a hot water tank up stairs, im guessing the hot water tank needs refilling but i thought the smartfit valve would switch over and fill for me?

The header tanks in loft are full and water is clean (full system only fitted 2005) and the radiators etc still work ok, there is a bleed next to the hot water tank (near valve) and that has no air and a bleed above boiler, also no air.

Any thing i should do??

 

[spikebmth]

seems you have a airlock in your domestic hot water system.

how about the other hot taps, how are they?

 

[krismc]

Oh and its a baxi potterton promax HE boiler with no pressure guages anywhere on the system.

 

[krismc]

All hot taps are the same, if i leave the water to heat up 10 mins i get bout half sink of water on any tap i try then nothing up stairs and just a dribble downstairs.

 

[spikebmth]

the boiler & heating system is a different system to the hot water system.

as I siad you have a airlock, or blockage in your hot water system, you may need to back feed the hot water system, using cold mains, to back flush

 

[krismc]

how will i do that?

 

[tryitandsee]

How did you isolate the hot water when you repaired the isolation valve to the hot tap under the bath

Was it a red wheeled tap in the airing cupboard, or where ever you did, make sure you have turned it back on, fully.
If it was a red wheeled stop valve, they sometimes feel they are turning, but in fact they have broken.

 

[krismc]

No wheels on the valves it was badly leaking into living room so turned off boiler, and turned off the cold water feed incoming to house and turned both hot and cold taps on until they stopped and i replaced both valves just incase and put them in a more accessible place.

 

[tryitandsee]

Ok so crap from the tank has gone down the feed and partially blocked the pipe.

 

[krismc]

Im guessing the cold mains feed is via the tank in the loft, comes down through a gate valve (which is open) past a drain loop and into the hot water tank?

And there is probs some crap between the loft tank and the boiler?

So where is the narrowist point? and what should i do?

 

[spikebmth]

cold mains go to your kitchen tap, and your ball valves.

The low pressure cold feed goes thro that gate valve, into base of cylinder, then hot water to drawn by the taps from the top.

you can back flush at the kitchen, by using a piece of hose between cold & hot taps.

 

[tryitandsee]

Is this a case for the mixer tap in the kitchen trick, where you put you hand over the spout and turn both taps on, thereby forcing cold up the hot!

 

[krismc]

Kitchen is a living nightmare in plumbing! Could i lift basin off in bathroom and use the cold tap to flush the hot back there?

 

[tryitandsee]

Perhaps at the two new isolationg valves

 

[krismc]

Is this a case for the mixer tap in the kitchen trick, where you put you hand over the spout and turn both taps on, thereby forcing cold up the hot!

Ha ha, that did it! you posted it while i was making a coffee, i gave it a try while standing near kettle and 10 secs later i ran the hot and it keeps running, cheers for that hopefully thats it.


god i didnt even need to go to the van for tools, top chap