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...