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Hi, sorry for the delay. Can you please supply some details about your boiler? Make/model number etc.
Ok does the boiler have a digital display at all inside the flap? Have you held down the reset button for 3-4 seconds and released?
Restart or reset? If you turn the boiler temperature down and press the reset button (to the right) and hold it for 3-4 seconds. Then turn the temp up.