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I have a Vokera Linea Max central heating boiler. About two years after installation a howling noise could be heard whenever the central heating was on. The service engineer said this was a known problem and replaced the diverter valve bobbin. The boiler worked fine for about a year then the noise started again. New bobbin was fitted and the boiler worked for two months. A third valve has just been fitted and the noise started again minutes after the engineer left .
Anyone know what's going on please
Anyone know what's going on please