Recently my boiler started flashing it fault indicator light meaning that there is an appliance fault. I turned off the power to the boiler for 10 mins and when I turned the boiler back on it worked fine for a period before the indicator light comes back on. When turned back on it can work for 10 mins of 10 hours before the error light comes on and there is no connection between heating and hot water to reproduce the fault. Does anyone know what could be wrong with the boiler and is it something I could fix.
