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Was it a cleanser ,or an inhibitor - not sure which, but the boiler is due for a service in November so I will ask the engineer if I don't get our problem solved by then. Do the problem rads have Thermostatic rad valves fitted ? All our radiators have a TRV and I have already checked that they...

Two of the radiators don't heat up at all and a chemical cleaner WAS added to the system about 3 years ago by the plumber who did the annual service to the boiler. Yes.... there is a magnetic filter on the system. But you have made me think, because I don't know if the filter has ever been...

Our house was built in 2007 and we are the second family to live here - moving in in 2017. The central heating has been working fine - although the gas boiler is perhaps nearing the end of its life. But the boiler is not our current issue. Last winter two of the radiators did not heat up and...