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Contract I work on is exclusively WB boilers. So work on nothing but. Like every boiler they have their foibles. Most of which can be eradicated by fitting onto clean system and fitting a mini expansion on cold mains ( left hand block and water turbine adaptor are prone to leaking otherwise)...

As above could also be worth fitting a magnaclean and adding some fernox if not already fitted.

The original cover is sitting right next to it, good luck fitting it back on though.

Might have been glued in the past have three weetabix

Something like a 1/2" x 15mm would work but is really poor in terms of look and practice better to drain and repipe

Start by just undoing one valve when it's plugged. You can usually knock rad across on bracket.

Is it a new boiler and do you have a room stat fitted I'm assuming the link has been removed usually a grey spade connector

Murder in the first very overlooked film.

Try squirting a bit of washing up liquid in the pump with the nut removed. Can help free things up. We used to have a fair few of these on a contact I worked on. if its never been serviced over the years just a heads up that the flues had a nasty habit of rotting worth checking/ getting...

. Unless the coils gone (unlikely) there shouldnt be much chance of any contamination its basically just copper. When cleaning header tank any crud/sediment will have been disturbed and will have to work through system couple of baths and it should be running clear again. Also make sure lids...

It should clear once its been run through a couple of times

£600

Could just be air. Have you tried bleeding the pump.

http://www.baxicombiboiler.co.uk/troubleshooting-manual/ Worth a read through

Can sometimes be better getting a fixed price repair from baxi once you take into account the price of a new pcb. Always worth having a look for scorch marks and checking harness connections

Could well be the pcb but would expect a lot higher reading on the thermistor around 12k (assuming it was taken with the water cool ?). The magnaclean sometimes have a black o ring undo and retighten bieng careful not to overtighten before you go down putting ptfe around.

Worth checking with the thermistor on these check resistance if competent.

Contacts. finished on my current deal looking at upgrading to a cat s60 it looks like it fits the bill and the flir could be useful any other suggestions. Must be rugged and have a decent battery life cheers.

I think most installers would rather use an internal drain option where practical it saves drilling through a wall for one. Not always possible though. Should be in 1 1/4" Outside minimum anything less is just lazy.

Yes very likely that water gets on the fan or such like and trips the boiler electrics. You need to confirm if there is power into boiler and check the continuity of main pcb fuse (the white one ) ( this can be done with power off) if you are lucky there will be a spare fuse in the plastic...