i have a combi boiler when i have a shower now the water fluctuates between hot and cold the shower is a mixer one it used to go cold if the hot tap in the kitchen was turned on but only then any ideas
your central heating boiler should be providing you with consistant hot water and this sounds like you need to get a heating engineer in to have investigate further as it could be a blocked heat exchanger, sensor fualt, burner pressure, shower mixer mixing, venturi, inlet pressure
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