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Its the older type with black facia and green knobs.

Thanks for the reply! Would this problem occur even with a new diverter valve?

I am having an ongoing intermittent issue with my Vaillant Turbomax combi boiler. At first I wasn't getting any hot water unless the central heating was on. This seemed like a standard problem with the diverter valve. A repair guy came out and thought the same a replaced the valve. However...