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Ikon-t boiler firing problems?

When heating the water the boiler continually fires for 5 seconds then stops,then fires for 5 seconds then stops ,this happens continually. The water is therefore only warm. What's the answer.
Bri, August 2007
jaguar combi boiler, on the display led, f1 is showing, i have no instructions 4 this boiler, no hot water/heating, it trys 2 fire up but no look

jim, August 2007