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F5 fault Happened first time ~18 months ago Plumber called in – overheat thermostat had triggered – push reset – OK ~12 months Started doing it increasingly frequent intervals – now almost every few days Replaced overheat stat, checked connections, still doing it Fault finding flow chart...

Our house is a dormer construction with low (~ 1m) vertical walls between the pitched roof and the floors of the first floor rooms. Behind these walls are triangular loft spaces, accessible via small trap doors. The low walls are insulated by rockwool roof insulation jammed between the studs...