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Thanks for your interest BARNY78BG. As I said in my first post, the air would end up in a couple of radiators and the drop in pressure would appear after venting these rads.

An update. It is late but it might help others with similar problems. In the end it was the expansion vessel that was over inflated. (I remember the installer's assistant pumping it up). I reduced the pressure to 1.5, as specified on the label and since then there have been no drop in the...

Thanks for that Tony, I will try that.

Good advice from you all, thanks.

The Magnaclean filter has been trapping loose metal debris but the rest is sticking to the pipe and radiator surfaces. Maybe when some of it becomes loose, it is caught by the filter. I was told the best way to loosen all that is get power flushing. There are other brands of cleaners that...

Thanks guys for your interest. Come to think of it, it could very well be hydrogen gas; it smells like it anyway. As heating modifications were not complete, the system has very little inhibitor in it at the moment. I was planning to flush it and top it as soon as I was sure of no leaks...

Thanks oilhead for your response. If the sealed system is not supposed to let any air inside, then as you said, there may be another small leak somewhere else. Having eliminated the ground floor circuit, any long term leaks in the first floor pipework would have shown up through drips or...

My open vent system was converted to a sealed one a few weeks ago. A Magnaclean was also fitted on the flow side, after the heating zone valve( not an ideal position but there was no space available on the return circuit). Following the conversion, I noticed the pressure dropping regularly...

I may have spoken too soon in favour of a Viessmann. Reading older threads about their boilers makes me want to eat my own words. Not a single word of praise. Some of their installers have stopped using them all together.

The present 18KW Profile was undersized to start with. After the garage conversion it has become necessary to fit something bigger. I was in favour of a Vaillant (28kw) but I was told that the present 22mm pipework will need to be up-sized to 28mm (between the boiler and the pump). From what I...

Thanks Gasman. Any idea how much I should expect to pay for a just a boiler change. All the part L upgrades were done 6 months ago. Obviously it will also need a powerfrlush etc.

All you guys here were very halpful sorting out my Profile60E problems. As I am now going for a replacement boiler, I would appreciate any advice on this subject. I am looking for a 24KW for my open vent system. My main priority is reliability. I am also looking for stainless steel...

It was diagnosed to be a faulty main burner solenoid. Bad news was that it is no longer available. The alternative is to replace the whole gas valve which itself is discontinued (a compatible Honeywell valve is available). All this appears to be costly for an aging boiler and I have decided to...

Well I did leave it on for more than 1 hour with the pilot and the fan running but still no fire in the main burner. :?

Hi Kevin Since my garage conversion, my current boiler (18kw) is a bit too small. Ideally I wolud like to have a 24/26kw output at my disposal. Will my present 22mm pipework will be sufficient? I was told that pipework would need up-sizing for a 30kw boiler.

Hi Tony Thanks again for your reply. I have no desire to mess around with Gas issues. I am one of those people who like to know how things work and what makes them go wrong. I have been looking at Vaillant boilers for open vent systems. Their output jumps from 18kw to 28kw. My present boiler...

Thanks Tony for your time. I would like to know the cause of the problem. It has been left running in the failed state via timer/programmer for over 10/15 minutes without any change. How much longer do you think it should be left on? Could this be something to do with the heat of pilot?

Thanks kevin You did not mention Viessman. Last year when I was looking into this matter it seemed to be the buzz word. To be honest, I am quite happy with a Vaillant myself. I know I will have to bite the bullet. With this scrappage allowance you mentioned, it may not hurt as much. I just...

Hi Ronaldo Sounds like an expensive option especially for a boiler of this age. Can you recommend a realiable heating only (open vent) 24/25KW boiler? Last autumn I was looking into Viessman & Vaillant as preferred options but maybe by now there are even better ones out there. Any...

So you living over 'there' go scot free!