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How to fix hot water running hot then cold intermittently?

Hot water runs at full temperature then goes luke warm then returns to full temperature. Viewing boiler whilst running, the burner keeps kicking in and out. Whats the cause??
Paul Power, February 2010
sludge in plate heat exchanger and will need to power flush boiler and plate exchanger or remove and chemically clean plate heatexchanger

k, February 2010