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What would be the long term solution? To have HW firing on demand? I have this problem every spring to summer.

I checked the HW only now and the pump shows 34W on CP2 while the temp readings on the boiler flow is 60C and return 50C.

I did install the 7x2 and it worked out pretty well. I was able to kneel and later sit on it in the middle section without any problem although there was slight wobble sideways (I am really glad I went with C24 and 7x2 in the end). I did, however, damage the roofing felt in the process. Any...

That was HW&CH for now.

Ok checked the flow and return at the boiler and they 62C and 53C correspondingly.

So looking at your table this 35 W for CH+HW in CP2 is way too low I suppose? Should be 45W so significant drop.

I changed today to CP2 and for CH & HW the pump is showing 35W. The coil dT was about 10C - similar to how it was before. I did not do the HW only test yet. Will do tomorrow. I am still to check the boiler flow and return pipes. They will be visible above the boiler so should not be a problem...

How do I check the boiler flowtemp is reaching 60/65C? Do you mean take off the casing and measure the flow and return pipes with infrared thermometer?

Ok I will change to CP2 and report back on the pump power and coild dT. The boiler fires up on HW only for few minutes only (that's the last time I checked yesterday). Yes I am still venting the thumb vent from time to time and some air comes out every time but not much. I suppose the constant...

Ok checked the readings and inlet pipe has about 35C-40C and the outlet pipe has 45C-50C.

Ah ok I get you. There is no such valve and no bypass valve.

Are you referring to the gate valve here? It is few meters away from the coil and is on the cold feed pipe. I believe this valve is to isolate the tank F&E tank from the system for maintenance and is not directly related to the coil outlet AFAIK and is not a by pass neither. Still to do the...

Yes I did look into F&E cistern and it is fine - no sludge build up (I drained the system down in June and cleared all the sludge that was there and there was a fair bit of that). I am not sure how long it takes to reheat the cylinder as I did not have to use HW for a while after it went cold...

See cylinder from close up.

I think the only thing that remains to be checked is the slackening of the compression nut right? Not sure I can diagnose more unless I missed sth from previous posts. What I mean is I cannot make the system work any better without my physical interference.

Re the slackening the compression nut that attaches the cylinder coil top pipe to the coil inlet see the photo attached. Is this the right one? Other than that I did buy a infrared thermometer to test the reading of the A & B (I could not verify them by hand as they were too hot) and I did...

Checked the gate valve by closing it fully and opening and all fine.

Re this if I checked and have the magnet attaching to this section around where it tees off in many places how does it related to the fact the pump is pumping at the right speeds on the CC2 settings in different HW, HW&CH, CH modes? Maybe the blockage is just partial and the flow is about right...

See a photo of the HW cylinder.

I've done this test and did not get any vent pump over both with boiler starting and boiler switched off. Waited good 5 mins.