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I think I have solved the problem. My Magnaclean was quite dirty with sludge and I think this was reducing the pressure through the heater exchange unit. Thanks to everyone who posted George

Right, the best set of reading i could get Both the H/W and the C/H are running. Boiler switches on First noise - 2mins 10 secs Second - 2mins 44 secs Third - 3mins 55 secs Fourth - 4mins 40 secs Fifth - 4mins 55 secs Sixth - 5mins 3secs Seventh -...

Thanks to Reneel, I did consider boiler silencer and as it's being serviced on monday may well add it then. Have you had any experience of using it yourself? To other post, have been monitoring allday and will post results of what the boiler does tonight. I also cleaned out the Magnaclean...

In response: If the system fires up it will run for about 2 minutes and then start the banging. Only after about 8 seconds and then after 6 seconds, getting less every time until the system switches off the heat. Then when the heat comes back on it will start again. By on and off I mean by the...

System is: Baxi Bermuda (13 yrs old) Piping 30 years old New Hot water tank Magnaclean fitted Spirovent fitted 3 way actuator fitted 2 years old Grunfoss + pump 6 years old Heating and Hot Water both work. The pump appears to be OK, opened the screw on the front and there was...