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bster you previously mentioned you are attending college. If you are taking an NVQ they generally cover very basic electrics, which will give you the basic qualification to wire boilers and controls.

Its a valve to control the flow of water normally with lots of exciting wires and stuff inside.

it wont work that way round! Try flipping the house on its side. or maybe check the pump valves are open.

I have yet to find an electrician who truly understands heating wiring, get a good corgi in.

Burner lock out ,due to not detecting flame pcb, wiring, electrodes,gas valve

Which led flashes (should be four on front)?

your into the realms of disturbing gas carrying parts and should get it checked, A service should sort this fault if your lucky.

Ok then you state the boiler is going into overheat. Have you confirmed this with the error code lights in the manual or just a guess? if it is overheating on how water demand try and identify the flow and return pipes entering the dhw heat exchanger carefully touch them, better still use a...

poss blocked secondary heat exchanger. due rads being added to system and installer didnt flush or inhibit it. :lol:

yes

Your plumber probably used the external mains stop cock to isolate the suppy thats why he fitted an iso valve.

yep thats the one.

overheat protection. possibly cdi protects itself "by removing residue heat by turning on fan and pump", but yours sounds as though its going a bit too long.

modulator coil resistance approx 50 Ohms

Flame rectification by spark electrode if i remember right.

Get more quotes, Your micro bore should work if it worked before, but if it looks like its been beaten with the hoover most wont want to touch it.

If your worried then turn the gas supply off, at the meter or at the appliance (meter safest).

You can buy standard ceramic tap valves from most merchants, but there is no gaurantee they will fit .

Got one of those for crimbo looks really cool, only use i found for it was on my boys moped :) . maybe ill put it on ebay.

If its rusting through its not worth saving, face facts you need a new bath. :(