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Exactly how I felt as I sat down with a well deserved beer! Do you chaps think it's worth fitting a Magnaclean if I'm going to be draining down? As mentioned previously, the garage rebuild in 2-3 years time will involve replacing the boiler with a combi, getting rid of the HW tank and...

An update, I managed to clear the blockage last night, which was at the cold feed tee, confirmed because the last couple of days the return pipe was hot to that point then cold straight after. Also bleeding an upstairs radiator it just trickled out rather than spurting out as it used to, so not...

The bleed pipe is on the return not the flow (see diagram above in post #32). There was a small downward turn so any air in that area never made it up the cold feed to the tank, caused a few airlocks which is why the bleed pipe got inserted there at a later day. I did leave the hot water on...

No magnetic attraction anywhere near the tee or any exposed pipe work. It did get very attracted to a nail sticking out of a floorboard, so at least I know my magnet works! There's a bleed pipe just 2 inches from the tee and it was added later than the rest via push fit fittings, so once I've...

Here's my setup, exactly like this...

Please explain further, which 3 ports?

I have read about that, but at weekend I opened up the drain cock and the F&E tank feed starting filling fast so I guess the cold feed is ok? Didn't want to leave it too long, the F&E tank has 15 years of gunk in it. In fact the first step in me figuring this out this coming weekend is...

That's in my plan, the wall the boiler is on is in the garage and is damp and falling down, with an asbestos roof. I plan to get the whole garage rebuilt in a year or two which will involve replacing/relocating the boiler and most pipework. Simply can't afford it at the moment. Until then, I...

Please see post #12. Point 3...

That's actually exactly what is happening (check my sequence of events post). When I say it stays lit I mean stays lit longer than 1 second, probably for 2-3 mins until kettling occurs and then cutting out because the flow temp has reached 60C. (in HW mode, in CH mode it stays lit a lot...

Ok, interesting. Is there any way to rule out a flow problem 100% though? In the past, when the pipe at the boiler got hot, the pipe up at the cylinder used to get hot within a minute or two. I remember this from 15 years ago when the cylinder was replaced and we got an airlock, seeing how...

With the DHW flow blockage, surely the boiler manufacturer will likely fall back on me having to sort that out first? And if that's the problem, I'll be paying another fixed price to them for the same diagnosis (assuming they'd only fix boiler faults not clear system blockages?) I guess I need...

It does it with the CH on as well, but it just takes a hell of a lot longer to get to that situation as I have to wait for the whole system to heat up. The video above was when I turned the CH on, 2 hrs after I'd had the boiler on for hot water. The problem is, now BG have diagnosed the...

Tony, I've been saying the opposite. e.g. at point 6 above it lights fine when the flow temp is far too hot to touch. Then 2 hrs later when it's all cooled down it fails to light, taking 30 attempts. Each of those 30 attempts get it a little bit hotter (as can be felt on the pipe which is...

Probably helps if I detail the exact sequence of events leading to the video. 1. Boiler hadn't been on for 12 hours so all nice and cold 2. Turned on hot water only at 8pm 3. Boiler fired up, fired for 2-3 minutes until boiling/kettling noises could be heard then cut out 4. Felt the HW flow...

Not quite. The gas valve was replaced last year and worked fine all through winter, the recent fix was simply patching the ignition electrodes cable and doing the annual service, and I only noticed it since then doesn't mean it wasn't doing it before that. And it works absolutely fine from...

Ok. A question from my first post still confuses me, if it's cutting out due to the temperature, why does it then eventually fire up permanently, because each of those 30 attempts has been getting it slightly hotter each time.

Oh the final thing I forgot to add, the BG engineer added a half a bottle of Fernox F5 into a radiator and said it may sort out the issue, 50/50 if it does or not.

Ok thanks. You'd think it would measure the temperature differential first before deciding to light! It's a Halstead Best 50, nearly all internal parts replaced in the last 1-3 years (thanks to the £99 excess for BG homecare call out and broken gas valve last year, they changed everything else...

Hi all, I've got BG homecare and called them out for a fault with the boiler, he ended up telling me there was a blockage in the gravity hot water flow/return causing the boiler to get very hot at the flow output location and cut out. So the boiler always lights from cold, but then if I try...