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Just thought I would round off this topic as all is now well. Thank you to 'agile' for alerting my engineer to the possibility of those tubes inside the 15litre storage vessel. He had not seen this problem before. A good 4 hours however and a lot of mild swearing later, the vessel was removed...

Thanks to all who have an interest in my post. As it is now Bank Holiday, I will be unable to progress this with the engineer until later in the week, but as previously explained, at least I have full CH and HW (albeit very slow). Apologies to 'Agile' - I gave the wrong name to the part I...

Many thanks for your speedy reply. Much appreciated. Luckily I am covered by service agreements and I hope I will not have to spend much on this issue, but before I call the engineer back, I have looked inside the casing for the part you have described. (I am sure just looking won't harm anyone...

DHW flow now measured at less than 4 l/min. Should be lot higher. Engineer has changed gas valve (other unrelated problem), removed and de-scaled DHW heat exchanger, changed divertor valve and now OK, removed and checked flow regulator (aqua sensor I believe) and now OK, removed and checked DHW...

I am delighted that some of you out there have taken the time and trouble to reply with expert advice. Many thanks indeed. I consider myself a competent and enthusiastic amateur, but of course I will not touch all this gas stuff. However I am intrigued by what the following adjustments mean...

I am delighted that some of you out there have taken the time and trouble to reply with expert advice. Many thanks indeed. I consider myself a competent and enthusiastic amateur, but of course I will not touch all this gas stuff. However I am intrigued by what the following adjustments mean...

About 3 years since last service. Likley long overdue then ! What causes the burner pressure to change over time ? I somehow imagined that this type of adjustment was static for the life of the boiler. Incidentally boiler is a Aua Plus (or is this a turbomax 824 ?),5 years old and mounted in...

Thanks Dave for your useful advice. I presume adjustment of the burner pressure is a qualified person job and should'nt take too long. I cannot see anything on the boiler that looks like a DIY adjustment ! Jeff White

Last couple of weeks the following happens: Boiler goes to lock out, F 28 fault on display. Manual states no gas, insufficient gas or elecrodes problems. But after resetting the boiler about 4 times it all comes back to life and stays like that for up to 2 or 3 days. Then lock out occurs again...