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Thanks guys for all the help ,AAV actually still worked when I took the cap off it , took the whole vent out first just to make sure and cleaned it as best as possible for now ,put it back in and gave a slight tighten then toppeed up the system again ,bled it by the whole AAV being loosened...

If your talking about the diverter valve ,I'm as sure as I can be that it's working O.K ,all valves open/shut ,all pin ends are greased and slide through the valve very easily, the diaphragm easily switches the micro valve switch on ,water flows through O.K until it gets to the burner ,then...

Just opened up the chamber ,AAV still had the black plastic cap on it and at some time its been leaking quite well (air coming out with trace of water) and its all green crusty solution, anything I can do to it to clean up for emergency weekend use , de-scaler etc and then leave the black cap...

Can't say I tried that ,it's got one of those auto vents up in the combustion chamber ,didn't think you could open them or close them either,hence the term auto vent ,I'll open up the chamber and see ,could well be corroded shut by now and not working properly !

After last weeks exploits of no hot water unless the heating was on, was finally tracked down to the valve stuck at the back of the diverter valve so hot water was going straight out the boiler flow , instead of the valve shutting and the water coming out of the HW flow. This week I've fitted...

Thanks again for all this help, be easier (especially on my ears nag nag) to send off for a new complete valve and just replace the lot in one go ,rather than trying to repair the old one ,only to find out it didn't work properly and have to strip down again .Thankyou .

Thanks for answering again gasguru ,I've just been looking for the receipt but reckon that's one I finally threw away , being self employed I keep virtually every receipt I get ,but periodically I have a clean up ,I can still picture it sitting on the floor, however long ago that was , it's been...

Latest update , now had a chance to get everything tested ,Expansion vessel is going to need to be re-pressurised properly ,it has air in it but is probably too full of water as well .Gasguru ,when the hot water supply is turned on, the burner ignites and heats the water but it flows into the...

Large idiot reporting back now , my filling loop is virtually the same as the one in the FAQ but some idiot had left the bloody thing open while in a brain dead state of mind (it's hidden behind the washing machine and didn't look at it again) so every time I opened the CH circuit the loop was...

I had taken the diverter valve completely off for a clean up when I cleaned out the water to water heat exchanger ,while boiler was stripped apart ,thought I'd clean as much as possible to eliminate dirty/broken parts of the boiler as I went along , will try some fresh silicon grease on the...

Little grey knob ? Don't know that I've got one of them ,where is this situated please ?

Thanks for answering ,I actually changed the diaphragm a couple of weeks back but that didn't cure the problem, valve was working fine then ,but it didn't solve the problem , that's the first thing that I thought had gone when I was having to dribble the hot water flow to achieve hot water...

Need help from an expert here please. Just lately my boiler has been performing strangely, the heating side of it works just fine ,but the hot water side lets us down badly .It used to give hot water if you reduced the flow while the central heating was on ,if no heating was on ,it runs warm...