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Yes it will have dried out now, that was your problem even a minute spot of water will cause that on the pcb

me thinks you need a proper engineer , not a new boiler

Did you cover the PCB housing with a towel or such before removing, the cartridge ?

I have had exactly that fault and it was a tooth on the synchron motor that was sheared off, either that or the synchron motor is not fitted properly and is jumping the gear mechanism

a 3 way valve as you call it can not stop all water circulation

try ideal 179050

be carefull it is not asbestos

Personally I would just pick them up when in screwfix or the like or order online, would never think of going into a shop just to buy a pipe slice, cant see your idea taking off

No you dont , you have a Main HE A , they are not the same boiler

just isolate the earth wire it isnt needed

old ventillation if boiler is now room sealed just cover them up

Make sure you leave a drain point open while re-pressurising or no point in doing anything

the problem will be with the zone valve(s)

well sorry but he is wrong

yes that is correct and you will have to link out any existing thermostat

It isnt the heat exchanger, you need a proper gas engineer , your burner is resonating at low flame and the gas valve needs set up properly, not for a poke and go neewbie

Check his Gas Safe on the register, he may have boilers only, he will need CKR to do the hob

unique to the Ri range of WB although i seem to remeber an ariston with similar

At the top of the heat exchaanger there is a plastic bayonet fitting with a clear hose coming off, turn the bayonet until water comes out of the tube, be carefull the water may be extremely hot

you have to bleed the main heat exchanger