I accidentaly pressed the red button near the switch of the heater, and the heater went off, the red light will not come on. How can I get the light on again to get the radiators working, it's a worcester 24 CDI
I suggest you turn the appliance off completely. Leave it for a minute or 2 and then switch it back on. The boiler will go through some automated system checks before re-establishing the link with your room thermostat, the red light should return.