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No leaving X400 in will not cause any damage, it will neutralsr itself anyway, but never leave X800 in

Release all the pressure from the boiler then close the drain point used and you will be able to snatch the valves , a little water will come out but not a lot , as long as you close wherever you released the pressure from

The correct name is terminal guard and that looks like a vaillant terminal but you can use any they are not specific

A very inexperienced waste of space, grommets for that are readily available for very little cost, an experienced engineer would sort that in seconds

as @muggles says the condensate is blocked

what boiler do you have ?

Alpha do not actually make boilers , they are made by Immegas in Italy, the new range is very impressive, far better than the other boilers you mentioned

The small clip holds thr actuator motor, the large clip folds the cartridge in remove the large clip and pull the motor and the whole assembly will como out

you uninstall the app on your phone then download it again the scan the qr code on the bottom of the thermostat

Bridge your room thermostat out and see if it fires

set the boiler timer to constantly on and the thermostats will take over

Doubt if it is the boiler that is at fault, I think you have a neutral fault on the boiler supply. The siemens controller is simply a switch so it wont be that it will be on the electrical supply to the boiler

as @RandomGrinch says, post a pic of the control panel of the boiler so we can see what your set up is

removed

what is it uou want to install a nest or a Hive ?

no as already posted by @RandomGrinch it is simply a switch doesnt matter which way round

which programmer do you have ?

NO it is a safety device

Try opening that valve manually, slide the lever across and latch it open, then turn on one of the other circuits, and see if the water circuit now heats. That would be unusual but possible, are you sure it is a combi ?

First thing to check , have you bled the calorifier ? small white tank on right hand side inside the boiler, using a 13mm ring spanner crack open the brass bleed screw on the top of the calorifier till water comes out then close again