I have a ferroli maxima 35c model and the digital box on the wall appears functional, I have hot water but no heating and warning of F3, I had been on holiday for 5 days and it worked when I left, can you help as I'm freezing
F3 - 100°C Safety thermostat trips • Flow sensor not active
or located correctly
• No system circulation
• Check the correct positioning
and operation of the flow sensor
• Check the circulator, the by-pass and
the valve in the system