The pump is brand new but thanks anyway.
I sorted the problem, the boiler had been turned up (somehow) to number 5 (Very very hot) so I turned it down to between 3 and 4 and it is fine now.
Can anyone help please? When I turn my boiler on at anytime of the day it makes quite a loud squealing noise, it seems to be loudest close to the boiler, this happens when the boiler fires up and it doesn't seem to do it for the hot water.
I have been told I might need to get a product from...