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I tried that, let out about half a cup of water through that valve. Pressure dropped with just that volume. I wasn't sure how much to let pressure drop. So I stopped, got valve to original position, placed cap back and started hot water Like dilalio said- pressure did go up and now it's...

The metal spindle with black plastic, can be moved with a flat screw driver from what I can see. So i remove the cap and expose the outlet and then use screwdriver to turn the "spindle with plastic".

Ok, spent sometime. I think I know what the cap at the bottom is. The metal thing, I was able to just bring it out by rotating it. The valve-at the top is another metallic round thing. You were suggesting using the cap as a grip on moving the valve right? That cap doesn't fit that valve...

Thanks for the reply ianmcd I am an absolute novice so confirming something first. in attached picture ive highlighted my understanding of whats the 'cap' and the 'valve'. Is my understanding correct?

All, Need your help. We were out of UK for a week and switched the boiler as well as the controller (honeywell electric unit) off. When we got back, I switched on the boiler and all seemed fine. There was hot water within no time. This was mid-night of 20th April. Heating wasn't needed so...

what is the ideal test?

so ask a registered engineer to carry out a full gas safety inspection?

I forgot to ask, can powerflush have a downside? I mean can it make things worse? If yes, then may be I should avoid powerflush.

To clarify Gas valve was replaced and fitted by Vaillant engineer. Flue fix was done - 24 hours so far, no leakages. Surprisingly, since the fix the vibration noise occurred only once and for a very very short amount of time : 2-3 seconds tops. before the fix - the noise was louder & lasted...

Dan_Robinson - you are funny. I am going to take your cue and hence forth refer to them as w****r & pratt! It was the w****r! btw he was so surprised that I didnt want him to do the 'oh so cool flush' for free... My being so non-technical doesnt help here. as explained to me, at time of...

Bunnyman - may I ask, what is the problem according to you?

basically he doesn't know. he said it's not the water contamination. He suspects that it could be the amount of gas that is meant to go through combustion & vaillant engineer didnt adjust it when he changed the gas valve in october. He said if he tried to fix it, it would nullify the warranty...

sounds about right ...LOL. :LOL:

The flue has been fixed today. there was an elbow shaped turn in the flue where 2 longer pipes were joined by a curved piece. That join is where the leak was. there was a black colour rubber ring inside which appeared slightly battered in a small portion. installer has replaced that join and...

new boiler has crossed my mind but as you can imagine is probably the last resort. i the installation was done in may, 2015. so if i were to buy the same new vaillant boiler again, can the existing flu be used? design of the property requires the entire living room roof to be cut through for flu...

Yes, there are 4 hatches approx 1 meter apart. thats how detection of point of leakage was relatively straight forward.

sure your point is noted sir! but then I do have to find a way out and seeking advice for that.

They are a team and the person who is gas safe registered took the ownership when I confronted him. Whats your opinion on dark water causing vibration in boiler and magna clean being of any use?

All, The boiler was installed in May, 2015. it has created problems from day 1, at the bottom is the previous issue I had posted. The gas valve and the 'electronic plate' were replaced at the end of that incident and things ran fine from October till about 20th Dec. 1. After the replacement...

i am thinking of way forward on this installation. is it possible for me to get a registered engineer to review, fix existing flaws and then certify as a legal installation? to what extent would someone change the existing installation to certify it?