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This is the Breville bread maker, correct?
This would indicate a failure of the thermostat.
As you probably know from the manual, if the letter H is displayed its due to the unit being too hot. If this is still displayed on a cold unit, the sensor is faulty.
Unfortunately I don't think this is a part you will be able to replace yourself very easily. I can only suggest taking it to a Breville agent
Sorry it was not an easy answer or fix for you