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Hi Tony, How can i check the motorised Valve ?

Thank you foir the constructive advice i will drain the system down a few times and have a look at the pump also. The magnaclean is a good suggestion also and i will look into that.

Hi, i flushed it as some of the rads were not getting hot and they had been bled and all air removed. The sludge hopefully went back into the machine and then out the dump valve at the end, but i have no way of knowing for sure other than what i saw going doing the sink which looks like...

We have a potterton profile 80 boiler, I just power flushed it the other day and the central heating isn’t working, it fires up then shuts off, the hot water works fine, I have checked for air in all rads and bled the nipple below the tank in the loft where the flow and return are located and...