Vaillant VCW242E

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cherrymetal

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I've been trying to replace the diaphragm in the water section of my VCW242E boiler.

I've got the instructions from Vaillant, and followed the steps to turn off the boiler; gas service cock, CH service cocks (x2) and the DHW cold water service cock.

The next stage was to undo the unions on the water sections. As soon as I did this water came pouring out, and not just from the tank in the boiler.

I re-tightened the unions.

Then ran the hot tap, and even in this state with the boiler supposedly isolated, water still flowed and continued to flow.

The obvious thing was to turn off the water at the stop cock (in the house) and it hadn't been used in so long that the tap snapped off.

Next problem, can't find the stop tap in the road. I'm in a terrace of 4 houses, the outer two have stop taps (which work) of their own, and the middle 2 of which mine is one has a cover under which is full of mud!
I tried digging it out as best I could but had no luck, and even if I managed to un cover the tap, I doubt I'd be able to turn it off. I've called the water board and they are going to come in up to 5 days!!

Can anyone suggest anything else I could do (or haven't done regarding the boiler??

What really stumps me is the water still flowing out of the hot tap even when the tap on the boiler is off!
 
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What really stumps me is the water still flowing out of the hot tap even when the tap on the boiler is off!
Click to expand...

you did turn the grey knob near the water section underneath the boiler off not the white one on the front of it :?:
 
Yes, a grey plastic knurled nut on the same bit of the casting where the union joins the cold water in flow.
 
err if its passing and tbf ive never known one to
your up the creek unless you find a stop tap that works :cry:

only other thing i could suggest is freeze the pipe and change the stoptap :idea:
 
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make sure its not just spinning and not turning the valve.

sometimes your just as well changing the divertor section
 
just checked it again, i'm sure its not just turning. the flow on the hot tap is less when its "off" (should be off) but not a great deal, there's a reasonable flow still going.
 
undo the screw in the middle of the grey cap and remove it thin try turning the valve with pliers etc could be as suggested the knob is just spinning :idea:
 
There isn't a screw in the middle of the knob, the whole knob screws onto the threaded shaft that goes into the valve, it rotates all the way till it stops (valve closed?) its not bottoming out on the knob, and the knob isn't spinning, I'm still stumped!
 
I wonder if your closing the filling loop rather than the cold water main?
 
Yes thats the one I've turned off. Could be a mixer tap I suppose, I have too, one on a kitchen tap, and one on the shower, is that common?
 
D

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