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I had a problem with the TRVs not working. I called a company a few months ago who employ heating engineers (who I'd used before). They said they could replace the TRVs and drain the system and that should solve the problem. They also said that in case the people who originally installed the...

Hi Getting to the end of my tether with our central heating system. Please help. 1. Boiler: Vaillant TURBOmax Pro/2 E 2. Recurrent problems with various radiators (with TRVs) not heating up ever since the system was installed two and a half years ago. Heating engineer replaced...