There are many signs that your system is suffering from a build up of what the heating industry refers to as sludge in the system
Leaving the problem could make it worse in many ways:
It is very common for the terms and conditions of Boiler Cover providers to state that they will not replace parts damaged by sludge until you have had a power flush. The most common repairs required are blocked heat exchanger , pump failure and valve failures none of which will be covered if there is sludge in the system. D Rhodes Heating Ltd powerflush for all the major insurance providers and issue you with a British Standards powerflush certificate upon completion.
Call now for expert advice on powerflushing