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Do you have a picture of the switch taken before you removed it from the wiring with the 2 loose wires visible also ?

It's the switch on the left side of the diagram that is not working as it should as I understand it ?

Try it ,and let us know the result.

Just to clarify ,when you released the switch from the mounting box, 2 red wires were loose. You then removed all other wires from their terminals. Is that all correct ? If so ,did you label all the wires so you could put them back into their respective terminals ? It would appear that you have...

Buy a new TRV and it will be a straightforward swap. The new valve ,wheel head/ lock shield, is not a direct swap.

:ROFLMAO: :ROFLMAO: :ROFLMAO: :ROFLMAO: :ROFLMAO: :ROFLMAO:

Monday afternoon around half past 2. :p

Are you certain that you are checking the actual PRV and condensate pipework ,show us pictures of those 2 pipes. Something is amiss here ,if you are losing 0.5 bar pressure continually, hourly ,water has to be going somewhere .

If you are losing pressure when the boiler isn't being used ,and nothing is coming out the boiler,it's condensate pipe,or the PRV's discharge pipe, that's indicative of a leak on the system. Is there any heating pipework buried in concrete flooring ,or a void under the ground floor?

Do you lose pressure when the boiler is cold ( not been used for a few hours )and not in use at all for domestic hot water or central heating ?

No. Old switch L2 and L3 = L1 and L2 on the new.

L1 on your old switch= com on the new.

The short answer is Yes ,you can .

There would be a marginal increase,most type 2 double panel BTU is less than 6000.

Is the wall behind the cabinet plasterboard,or solid brick plastered over ? I would be inclined to chase out the wall and bring pipework in through the back of the cabinet.

No.

Removal is required,and take to a plumbers merchant to match ,there are many versions. Also, replace both hot and cold valves.

Yes. Allowing air into the system using the higher radiators bleed valves breaks the vacuum.

Correct ,it's the vacuum that holds the water from continually flowing.

You don't need to do anything regarding the cylinder or anything associated with it.