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Water is not staying hot?

Can anyone help, our shower keeps showing low pressure and keeps going cold, the hot water only lasts for approx 30 seconds before cuttting out, then it's the same for another 30 seconds but cold then the hot kicks in and then the circle starts again, any suggestions?
Andrea, November 2012
What boiler if combi ,hot water heat exchanger blocked ,need clean or replace

ltd, November 2012