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Sorry, my reply doesn't answer that question. Heat only boilers will usually have a fan and gas valve, pump is usually external. I'm not familiar with that model tbh.

Fan pump gas valve and flow switch for hot water. Most other boilers have diverter valves, diaphragm, pump proving switch etc etc. Also no plate heat exchanger in an intergas, which , are prone to blockages on dirty systems.

I fix all the different brands and models of boilers, as a local independent boiler engineer. Took a 14yr old Worcester out of my own house last year and fitted a 36/30 hre. Always fit intergas with customers too. 4 moving parts, so little to go wrong mechanically. Simple boiler but ugly! Bung...

this site looks handy. I've done a fair bit of building joinery repairs over the years. lots of helpful pics here. https://www.wisepropertycare.com/news/dry-rot/difference-between-wet-rot-and-dry-rot/

primatic cylinder maybe? stuck pump, pure coincidence?

I'd rule out a faulty non return valve on the shower first before pulling the boiler apart.

Should have said partial blockage tbh. Amount of water going through plate is reduced , water gets up to temp quicker so thermistor acts correctly. It's also possible the shower head needs cleaning or a non return valve is stuck open. Usually the hot side on the shower.

Blocked plate.

Repressurise, shut boiler off of flow & return, leave for 24 hrs and re open, pressure drop? Leak on system . Pressure up? Boiler.......

Dare I mention expansion vessel?

what about the single insulated wires that come from the switched spur to the jumble of connectors in a metal back box? thats compliant????? the filling loop is wrong (from what i can see in the picture) if the valve pointing down is attached to the cold water main, then the nonreturn valve is...

Designer rads, designed to look good.... and they do...... that's about it.

Speak to Stuart Turner (pump firm) they'll size and spec want you need.

Typical boiler slinger install then, get it in, get paid and then get the fook out of here! Getting the original installer back might prove difficult........

Nope, that's for the unvented cylinder. The one you're looking for is usually red.

OP says ' I'm moving into a new place' That would suggest they already own it. If the OP has not bought it yet, I would advise to walk away from the purchase, unless it's their dream home and can afford to have the boiler refitted correctly. From the pics I seriously doubt it's been...

Standard size expansion vessel inside the boiler? No extra expansion vessel anywhere?

Ring gassafe and ask for an inspection. Open a big can of whoopass on the installer.

Re pressurise the system. Turn off boiler Isolate flow and return under the boiler. Wait 24hrs, if pressure is ok on boiler it's not that, if pressure drops when you open iso valves, the leak is on your system. A few minor weeps that evaporate can also be a cause.

If the boilers been off a while gas valve could be stuck. You need an RGI to test it.