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So when the water cools down again it returns to a solid state and becomes an obstruction or even better it clings on to a flow switch or sensor. I would not be tempted in using unless I could remove it totally straight after soldering. Pete

The optomist view would say that it maybe residual oil as the initial cutting would have soaked the area. The only way to be sure is to test the pipe from the tank to boiler under pressure . Pete

Gav you never know a " Vapid waste of space " maybe a compliment these days since the kids seem to change the meaning of most words to the opposite. You sick gross git Pete :lol: :lol:

Yes it suggests your pump is fooked. Pete

Difficult to decipher your question, however the pump runs after the burner has turned off to circulate the heat away from the exchanger to your radiators. This is a normal function. Depending on manufacturer and model this can run on for a few minutes. Pete

I have seen tilers use handfuls of quick dry cement thrown on top of self levelling compound to dry out, not sure if it would work with DPC compound. Pete

Ah yes I missed that important bit :oops: Pete

All I can see is Ferroli misspelt in the title no model details. Pete

Possible hole in your hot water cylinder coil if you have you one which is mixing rad water with your hot, although this would not affect your cold direct mains. Pete

Question is it possible to change? Is it very difficult? Would anyone know how much it may cost? Yes it is possible. Cannot see how difficult it is from my rear garden window view The only one who can tell you has to attend and inspect the system. Pete

115mm angle grinder carefully cutting it all round. Then use a rubber flexible connector which have steel jubilee style bands. The come in various diameters into which you can insert a 110mm pvc pipe. Pete

The landlord (if not you) will need to give permission and require drawings with relevant fire and building regs considerations as they have a duty of care in respect to all leaseholders in particular a Fire risk assessment. This work is notifiable to Building Control. Pete

My crystal ball cannot see as far as Scotland :roll: Pete

You may have a shared cold water supply and water hammer is occurring when the neighbours use the supply. Pete

Those taps have ceramic valves to open and close the O rings just seal the actual valve cartridge to the main body. Pete http://www.ebay.co.uk/itm/like/281080815591?hlpht=true&ops=true&viphx=1&lpid=95&device=c&adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0&ff12=67&ff13=80&ff14=95&ff19=0

The secondary exchanger. Pete

That is the widget next to the flux capacitor to be clear? Pete :lol:

It could be various issues. Most likely your heat exchanger has clogged up or your thermistors are defective. Pete

Like I said we always test the water and pipe work before recommending a power flush. Where are you based in London? Pete

Can you give me your friend of a friend details as I would like to use him if he only charges £600.00 for all that work. Most boiler fitters charge more just to install the boiler never mind piping up 4 radiators too. Pete