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The pipe in pick one leads to under the boiler st the top of that pipe as it connects to the boiler is a valve turn it off there. If water still comes out of the hot then it is crossing water.

Get group service in should be under warranty, or installer back?!

But when you shut it off did cold water come out of the hot? If it did then sounds like the cold is crossing. If you shut the cold going to the boiler only off then no wTer should come out of any hot tap.

Was it ok before? Sounds more like a pump fault,ntc or blocked hydraulic either in boiler or pipework

Can you isolate the shower?? Or as a test shut the cold inlet to the boiler, and turn the hot on the tap to make sure the cold water isn't crossing over via the shower valve. Still maybe the diverter mind

Should be fully open but when fully open may be to much for the boiler to handle.

Hi have you slowed the flow from the hot tap down? Ie opened it only about quater and tried the hop tap?? If not give it a go if it comes out hot then it may be going through the boiler to quick and may need a pressure reducing valve fitted to the cold water in to the boiler some installers just...

At worse do you have a friend that can help and a outside tap? If you do attach the hose to the drain point with a jubileeclip and open drain valve slowly then turn on outside tap to refill via the rads. Or call the chap that fitted your new rads and tell then the pressure has dropped on the...

Sound like a pump problem or circulation fault as the boiler trys to heat the water pump maybe stalling then big heat hits and it starts up again.

Link the r to the L this should power the switch live, but with just the LNE connected should bring the interface alive as the switch live is only to start the fan and gas valve once satisfied.

Just turn the hot water side off on the programmer. You can push and pull the pin out when you have done this as the pin may have pulled out of the washer jumper in the valve, don't pull to hard or you will pull it out completely and get a eyefull of h2o

Test the pump, if its yonks old bin and replace also check header has water in

Turn all other trvs on other rads off, and if they don't all have trvs then turn off one side of all rads in the house and leave the one that dosent work on, if you have a cylinder turn off on programmer. So this will push out any air in the lines to the rad either in to the rad or out expansion...

Call gassafe and ask if gas regs are part of water regs and weather they cover both as a company on there register is going round illegaly flouting there powers to be and illegally condemned a boiler due to a water reg issue and not a gas safe issue. Also call British gas a complain as gas and...

Agile is correct as far as some points but some unvented coils will need 14kw plus just to warn you in your boiler selection so as a rule I wouldn't fit a system boiler full stop but a regular with a shunt on the return then make it sealed externally, with a mix that you have I usually fit a low...

Yes you don't know what you are doing. Get a pro in.

They won't pay regardless, as for a leak then no leak doubt that a leak won't just stop over night. As for a carcass time to decompose may be a few months, have you checked under the manhole covers could be a blocked drain.

I use powdered floor adhesive rather than cement, I know it says mortar but cement on wood just crumbles no mater what bonding or seals you use.

Some guys on this site are desperate, I can do it for x no I can do z. Really as for boilers to the op don't fit a ideal I'm sure someone on here can do a vaillent or Worcester install for £50 if you supply the boiler. Merry crimbo

Ferroli modena were the bees knees, quick to work on and repair only two parts I have changed are cheap, but seems you guys own the modern ferrolis this is the problem not like tony said, its not the installers fault a company of empty barrel promises, as far as I know ferroli are going down the...