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I did the test on other rads. I can't find one rad where the opposite valve heats up when HW or CH is selected. Do you think the return from the bathroom rad could be plumbed into the CH flow rather than the return?

:( Update, there is reverse flow in the rad next to the boiler which heats the CH flow pipe up and a little of the first rad in the room above the boiler but not enough to really present the problem of all the rads heating up.

No the bathroom return is under a tiled floor and hacking away at the plasterboard ceiling the kitchen would be a last resort. My latest test has confirmed this. With HW only on the HW return seems to be pushing HW through the rad return next to the boiler which goes all the way through to...

I've managed to get hold of the manual at it does show that the vent can be out of the top left of the boiler. I've done the test on a couple of radiators downstairs. With HW only left valve heats up first With CH only left valve heats up first. Weird because I thought the return from...

Ahh sorry, I thought you meant the 15mm pipe that feeds the towel rail. The 22mm one that I wasn't sure about in the photo isn't in the drawing but it does come out of the top left of the boiler and head straight up into the ceiling with nothing else connecting to it. As the other two 22mm...

It's the one between the HW MV and the cylinder vent that runs behind the centre of the cylinder and up the top on the right. I've labelled it "15mm?"

Now that it's filled up I did some testing with the isolator valve on the 15mm pipe. It looks like the 15mm pipe is 100% to the right valve of the towel rail. What I can't work is where the return from the rail goes. If this return goes into the CH return network would that explain why rads...

It's Potterton Kingfisher RS60 GC No. 41 601 37. I can't find the manual anywhere online. The pump is on the flow on the pipe that comes straight out of the right of the boiler. This was always the case. Really the only thing that was done recently was the CH MV replaced and a HW MV added...

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Also in the middle pic of the left side of the boiler there are two 22mm pipes entering the boiler. The rads and cylinder seem to return to the bottom one. The flow comes out of the right side. What's the top left.pipe?

Thx, The bathroom rad gets hot when only ch is on also but if there is a path from to the rest of the system I guess that would happen also. I'm going to lift some boards at follow it through. Regarding the subject, getting ch when hw is on is what needs sorting but I'm pretty sure...

Couldn't get a photo because there is a cabinet on the side but I could get my head/hand round the back enough to work it out and draw this. The 15mm pipe is definitely coming out of the higher one between the motorised valve and the cylinder.

Okay got you. I'll try again. the 2 x two port motorised valves have just been fitted on when HW only is on the pipe to the left of the CH valve in the picture doesn't heat up so I don't think it's passing through.