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The flow does not fluctuate but water too hot or too cold. I find if I turn the dial I can get the right temperature but it will fluctuate from hot to cold & I have to keep messing with dial. Before the boiler broke the temperature was perfect when the dial was turned to the locking position but...

My MIRA 415 (1993 to 2001 model) worked perfectly until my combi boiler broke earlier this year. Ever since then I can't control the temperature on the shower. Do I have a problem with the shower or the boiler?