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Sadly they don't make them like they used to.

Reset the boiler.

Glow worm system boiler no one has vented system any more. With a 15 year warranty. You'll probably have to upgrade your hot water tank to a tank with a modern high recovery coil.

Switch heating and hot water off. Is the gas meter static? Then you aren't loosing any gas. Heating on at night? Wandering around in shorts a T shirt?

No you have a problem. Turn the pump speed down to 1 to see if this is any better. Otherwise needs the plumbing looking at. if possible convert it to a sealed system. Vented systems have no place in a modern heating system it's technology from the dark ages.

Yes just needs the head swapping over.

Undo the pressure test point at the pump. It should push fuel out as it turns the pump over. If not possible if your ran out of oil the pump is now stuffed.

If you have fairly poor pressure and flow then go vented with a big pump to supply the whole house.

Unlikely that 4 showers will be running at once. 18 litres a minute is a bit on the poor side. I would fit an unvented cylinder and an accumulator tank. Feed all the showers from the accumulator and hot water tanks. I would use an ACV tank as these have extremely fast reheat times and...

It's a halstead boiler you'll have more luck searching for the manual for halstead and then you'll know the part number to look for.

Or the pressure to clear it. :)

Get a local gas engineer to get you the right parts and fit. British gas are hopeless. The boiler is actually a Halstead although branded as wickes.

Temperature sensor. The boiler is overheating and locking out. These are pants boilers to work on.

Connect up to outside tap with a hose. Push some cold mains through it. :-)

The first thing to do would be turn the pump speed down to 1. Open all the radiator valves at both sides fully. If still overflowing put a push fit cap end on the expansion pipe over the tank. The expansion can go back up the feed pipe. Most likely cause is there is a blockage in the...

Since this is a wall mounted boiler. If wall mounted and single pipe system with a non return valve then replacing the non return valve would be the first step. A leak in the piping is also very possible. Ensure there are no joints in the piping from the tank or those there are do not have...

Is the valve open? If so then the pipe is blocked.

Try topping it up a little with the filling loop. It should read 1 bar when cold.

T off the 22mm pipes. You can then go to the new radiator in 15 or 10mm. My preference being 15 as it looks better and heats up faster.