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Have the lead and the connections on top of the condensate trap checked.

It looks like your on a communal heating system, the box is a heat exchanger with a heat meter on the front of it, the immersion switches should be for back up.

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Does the system have an automatic bypass ?

If i t starts with an 8 its a combi, could be a stuck diverter valve at a guess.

Its a combi boiler chris..... dont know where the op got the RI from anyway check that the valves under the boiler to the heating circuit haven't been accidently closed.

Why use an s plan ? get rid of the 3 port and just have a two port controlling the hot water, the op hasn't wired a hot water off so the valve will stay in ch, probably find his boiler has shut down of the overheat stat.

I haven't followed your wiring description but it does not sound right also the three port does not return to hot water after demand , three ports stay in the last position they where in when demand has stopped.

Cut the pipe level with the subfloor and use a flexi connector to connect to the pan.

You wont get any replies unless your gassafe registered.

Pump overrun thermostat stuck .

bosch separate them to allow control of external controls, NS is neutral send to external controls, LS is live send to external controls, means the power can be cut when the boiler is switched off, you can also connect pump neutral to the boiler or in the wiring centre, as already said you can...

Look at nest on an s plan, very standard wiring set up.

The expansion vessel needs to be recharged, has the boiler been serviced lately ?

At that age I would be checking the spark generator.

I have never fitted an ideal boiler so will take your word on the SL1-SL2 ignoring the OT but at least I now know how to run a "plan" with opentherm on any boiler.

I would fit a separate 240v hot water timer and put a demand on the dhw thermostat/ zone valve connected to sl2, if the boiler stayed on low temp opentherm then short the OT terminals.

No not sure :) forgot You have to open the dhw zone valve and power the relay.

Fit an x plan (pdhw with NO zone valve) then you will need a relay to short the OT terminals when hot water is called for, shorting the cables makes the boiler run at high temp, when the relay opens the OT takes control of the central heating.