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I have the genus 23mffi boiler which when the heating is on the pressure flies up to 3+ bar. That is almost in the red, probably would go if the heating was left on. any ideas what this issue may be? Best regards

Hi all, I have the above boiler which appears to be producing hot water fine, however, when the heating is put on, it comes up to temperature and locks out, subsequent attempts at hitting the reset button fails after a few moments- if I leave it for a while it shall work again but not for...