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Are you sure the immersion hasn't been left on? Does the boiler and pump switch off if you turn the cyl stat down with the boiler running?

Looks ok to me, but choose one rad to act as a bypass by fitting lockshield valves to both ends, and leave them open, this is usually the rasd nearest room stat.

The blue light tells you that you have power to the boiler, unless it is flashing, which indicates a fault. My first port of call would be to see if the boiler actally has a demand for heat from the stat. If HW is working, then that's quite likely the problem

It would be far easier just to change the pan.

Could be a number of things, but I would need to be in front of the boiler to see what is happening. My bet is flame sensor, but you'll need a GS bod to install it.

I close the flow/return valves on the boiler which preserves the pressurised water in the exp vessel, and prevents air being drawn into the auto air vent. You just need to depressurise the system via a drain and crack on. If you have a enough play in the pipes, it's easiest to undo one side and...

Hideous boiler, skip it.

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.