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You can try adjusting the blending valve to see if this improves it by removing the cap, loosening the backnut then turning the square valve head with an adjustable spanner failing this it's more than likely a new one required.

Likely to be an issue with the diverter valve passing

A question we would all like to know the answer to. :?

Likely your motor has seized in the valve. If you try to push the manual lever over on the valve what happens? A replacement motor is about £12

If the boiler is continually at 3bar whether it is operating or not then either the filling loop is passing or the DHW heat exchanger is pinholed causing mains water to mix with central heating water

It's likely your DHW flow switch is stuck on. Try tracing the wires to it and removing one and then see if your boiler still fires

Price of copper cylinders/tank/pipework it's probably like for like with a vented system. Plus there is no need to have an extra tank/lagging/overflow etc etc. Unless however the mains pressure is poor

Depending on mains pressure your best option is a direct unvented cylinder. You would get hot water at mains pressure.

Depends on the pipework layout. They may have gone straight in and out through the rad have you tried putting it back on to see what happens?

Has the neighbour installed the appliance himself or has someone done it on his behalf?? Your neighbour might have paid for the job to be done in which case he may have presumed it was all above board. If he has installed it himself and is GSR he should have known better. If he has...

A photo of your situation may help to clarify it for you

You could try testing the thermistor from the PCB 25C 1.2MOhms down to 100KOhms at Temperature (82C)

Presume OP means the Kingfisher MF fan flued floor stander with boiler thermistor (two yellow wires to PCB).

yes same thing

agreed agreed. That is a separate issue which needs rectifying but not by a DIYer

Yep. very sensitive to dripping taps these boilers. The sensor in the cold inlet registers on a slight change in temp and fires the boiler up

Likely it's the flow rate through the bath tap have you tried reducing the speed of the flow though the tap? what size is the boiler ?

If it's already done there is nothing stopping you from taking the boiler off the wall. Turn water and electrics of first mind :lol:

Try a link L1 to 27

No. The gas needs disconnecting from the supply from a RGI.