To turn off your Ideal boiler, set the mode knob (often labeled 'B') to the 'BOILER OFF' position.
The 'BOILER OFF' setting completely shuts down the boiler's heating function. Note that simply lowering the central heating temperature dial (often labeled 'A') will only reduce the radiator temperature; it won't turn the boiler off entirely.
Therefore, to completely switch off your Ideal boiler, ensure the mode knob is in the 'BOILER OFF' position. This will prevent the boiler from firing up and consuming energy unnecessarily. Remember to consult your boiler's specific user manual for detailed instructions and safety information related to your particular model.
