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I’d imagine there might be a seperate red expansion vessel and pressure gauge somewhere and the vessel will need recharging. I can’t imagine the water in that custom being very clean and with the isolation valves restricting flow aswell I should think it would be very slow and inefficient.

Test points for sensors are on the disconnected connectors?, just get varying resistance readings at temperatures.

It’s about 2-300 pumps of a foot pump to charge those as a rough guide.

Gas pressure will be stubbornly stuck at 4.5mb and the pcb will sort it as above.

Connect the permanent live and switched lives that went to your thermostat in the wall either where your room stat was or in the wiring centre and leave your neutral terminated safely on its own if there is one.

Bg of 1992 was a completely different proposition to the remains of it left today!

Rates

If there is 230v on the orange there's no point replacing the pump, just disconnect the feeds and work backwards to see where it originates

The boiler parts aren't counterfeit, usually stolen but very rarely fake.

Dunno Dan, I've never been there!

A magna1 25-60 is about 600 retail so depends exactly what he specc'd and why.

I think the gas safe bit is fairly irrelevant, the prosecution would be on the dangerous condition.

If it were me I'd bung the system, saw the collars off the old valves and prise them off and fit 2 new closed valves and then replace the pump at leisure

It will be faulty sensors, occasionally the fan but almost always the sensors.

Turn mains power off to the heating system and see if the valve actuator returns to hot water position so there is resistance on the lever again, if it does then it's ok

Nobody ever used the stupid, useless key. Just a stubby

What happens if you turn the boiler stat down to number one?,they do go out of calibration and the scale in the hi can prevent accurate temperature sensing especially after 30 plus years

Not the jumpers, the actual 4 pin power supply cable. Is the connection to the display ok i.e. Not corroded

Have you managed to swap the two 4 pin connectors round when you swapped out the first pcb?