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Thanks for the reply Mick. Being though the central heating works fine on its own would you just clean the dhw circuit. The system is about 15 years old (i should of said) and for the previous 12 years there have been no problems.

I have a fully pumped open vented system with a Baxi solo boiler & a grundfoss 15/50 pump and a holywell 3 position valve. I have had this problem for the last couple of years but it always rights itself except this time.When the central heating is on only there is no problem, its only when the...

The system is a fully pumped system, with a motorised 3 way valve heated by a baxi boiler. The system is about 12 years old , never really had any trouble with it apart from renewing the motor on the 3 port valve about 4 years ago, and servicing the bolier every year.

When the c/h or h/w or both are on at the same time the pipes in the attic sound like they are about to expolode, the expansion tank is full of hot water, sometimes the heating works ok then the next day it wont work any ideas ?