Hot water not working

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i have a 3 way valve after pump, one inlet, one pipe to heating, one to hot water(it says it on the top). I do not know what kind of system this makes it. there is a slider on the side of the box, i have put it to each end and in the middle still no hot water.

jammie when you say you put it in the middle was this by control means or with your finger? if the lever feels slack it means its fully open to the heating position and is blocking off the port to the cylinder
is the lever always in the same position?

it could be jammed but this is easily proved by turning off power to the central heating system (by the spur not the progammer controls) and it should return to the hot water position

if it doesn't its jammed
if it does its getting held there electrically by either
a faulty cylinder stat stuck on satisfied
a faulty programmer stuck on HW off
or a wiring fault

matt
 
i tried to upload some pics of my 3 way valve but I just cannot figure that out yet. Will keep trying. Thanks for all the assistance so far, it is really good.
 
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your asking the wrong bloke! I have not altered anything except leaky valve on cylinder. I know it is a washing machine valve but as the water leaked through my floor I changed it immediately, the only spare I had was that one. I will change it back once sort the hot water problem out.
 
the hw side of the 3 port valve go's to one of them pipes on the top of the cylinder ?
have you lost hw since changing that valve ?
 
so you drained down when you changed the valve ?

have you a pic of them two pipes but further along towards the wall.
what ones hot ? pipe with valve or without valve ?
 
the pipes go across then down through the floor, though they both have bleed caps which have been bled. will try abd get pic.
 
Anyone notice the lead pipework looks like it draws hot water from the cylinder.

The two sections of 15mm look like the are a flow and return through one of those 'add it yourself' drop in heat exchangers.
Has anyone here fitted one of those to a direct cylinder? what was the outcome?

We approched the manufactures to see if we could fit them to form a second coil or exchanger regarding solar installs, but apparently the surface area is not enough for more than one panel or collector.
 
you said the two pipes go into the floor.

thought one came from the 3 port valve ?
what one with valve or not ?
what one is hot ?
 

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