Hi, I've just moved into a new house and am having trouble working the boiler. It's a Main Combi 24 HE. The heating seams to be working and the hot tap in sinks work. However the showers don't. There are two showers, one which goes from very hot to very cold and back, no matter the setting its on. As it does this the boiler powers on and off. The other shower is constantly cold. Any ideas, help or advice would be hugely appreciated. Thanks, Steph
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