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whats wrong with my little star fanned combination boiler?

HW working fine CH working but when heating on it fires up for 1 minute then cuts off and then comes back on again this goes on for as long as CH on. could it be the thermostat ,fans working ok,water pressure ok can anybody advise
jab, February 2009
Is it ravenheat not mentained on question than check flue installation on flue elbow installation on on top or temp sencer playing on flow pipe

Mr K, February 2009