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how do i fix a A 03 fault on microgenus 28 mffi?

how do i repair a fault showing A 03 on my ariston combi boiler

jimmy
August 2008
AristonHeating, Home Heating SystemsFault Repair Boiler
SHUTDOWN DUE TO OVERHEATING
This anomaly is indicated by “A 03” on the display. The boiler has shutdown because the safety thermostat detected that the boiler temperature has
exceeded the maximum limit.
To reset this state, wait until the boiler has cooled and press the reset button to the left of digital display under comfort switch.

Ian
September 2008

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