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Had to do that a number of times where the p/board is thin stuff, or the boiler bracket needs to go where an old balanced flue hole was, and I couldn't core drill the new brick/block.

I've just had to order one of those, 5 day wait.

Sounds like you have a sticking end switch in one of your zone valves

The black lever next to the pressure gauge will be the flow isolating valve, it should point vertically, not horizontally.

Do either of you use a Nebuliser? They will cause odd coloured flames.

If the boiler is firing, where is the heat going? Or is the boiler firing for a very short time? Maybe have a look at the pump, or check for a blockage in the pipework near the pump, where the cold feed from header tank enters the system.

Gross weight 105kg??? That would suggest the tare (empty weight) of the bottle is 58kgs. 20 something would be nearer the mark.

As above, then start saving for a replacement boiler:ROFLMAO:

Get a coupler of the correct size 21.5mm, cut it in half lengthways, and glue it on the hole.

Yes

It's a 10min job, pull nose out of flue, drill hole for PMK, fit PMK go home.

None of those valves will repressure your boiler, look for a silver braided hose somewhere else, maybe further down the pipework?

I always fit the Magnaclean pro. Easy to clean, & useful for dosing with inhibitor.

That white exp vess is for your unvented cylinder, there will be another one somewhere, assuming your boiler is a heat only boiler, and not a system boiler.

Somewhere in your system will be a pressure relief valve, most likely near the expansion vessel. Have a good look whether that PRV is letting water past. It may be that your expansion vessel needs recharging, I believe there's a how to in the FAQs on this site.

Dump your "engineer" for someone who knows Logics, easily curable.

Or you could change the siphon while you're in there

Ideal Logic everytime

Just seen your pic, I don't think those valves are Bulldog

Those look like Bulldog brand, as sold by Wolseley. Will the pins in the valves move up and down (only 2-3mm)?