Hello there I've put a new roof outside my house and I've had to move the flu as it would have been inside the area. I took the end cap of the flu and some condensation came out I then got some round aluminium pipe and stuck it on the end put it above the roof and put the end cap back on and now the boiler will not work. Is this because of what I've done or is there a problem? Any help would be good. Thank you.

Ian, July 2016

Yes it is because of what you've done.
You do not mention the make and model of your boiler

You may do well to contact Baxi for advice

Good Luck..., July 2016