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From your description it sounds like they are the lockshield valves and are indeed for balancing the system. If you tighten the screw under the cap it restricts/stops flow to the radiator. To be sure are you talking about the lockshields are they on the rad where the pipe enters the radiator...

Got the boiler fixed in the end, managed to get the boiler firing again by manually operating the APS, so I swapped that out for a new part (supervised of course) then it was back to cycling on for maybe 10 seconds then lock out. It would fire on CH ok but soon as demand for HW it went to lock...

Thanks already gave them the once over but will have another look in the morning. I only got chance for a quick once over as we had all but finished for the day, maybe tomorrow i will get chance to have a proper look. And of course if i need to remove the combustion case I will ask for the...

Thanks for the reply Firstly no i have not worked on it my engineer had the front off and left me to scratch my head. He is working on an unvented system next door which ironically I am the only one qualified to work on. But he is fitting the boiler next door and said if you can work out...

As thread title says. Ok I am a trainee gas engineer and currently undergoing my 80 hours gas diary. I work alongside a corgi engineer and he asked me to go take a look at a boiler for him (as above). Fault was, initially the boiler would fire up run for about 30 seconds and then go cold again...

Ill post a pic or two just as soon as i get chance i've actually been up today and it looks like im going to have to remove the fascia and trim it to send the gutters under the roof tiles. OH happy days lol

Sounds like the mixer valve has died to me the cartridge is replaceable and if you can remove it you should be able to take that in to a merchants and get a replacement.

Me old fella did the roof about 7 years ago then a tradesman who has since disappeared, presumably up a drainpipe did the fascias and guttering.

From what you've said i believe your considering buying a cylinder so you can have more pressure from the increased head of water and a pump if needs be to power a mixer shower. If this is the case then i would suggest an unvented cylinder which can be directly heated from your boilers flow and...

This is a no brainer because the side fixing taps are a total different design you could do it but they would look a right state. Total no brainer get rid and start again, i know ebay is great for bargains but you cant go wrong with a good plumbers merchants for these items. Stick a pencil...

New fascias and gutters installed but now the roof tiles don't quite reach the gutter in some places and rain falls down the gap and i fear for the brickwork below. Is there any weather proof material i can use (beside lead) to slot under the tiles and over the guttering to cover the gap. I've...