What the manual says
Manufacturer manualPress “reset” until “r” appears on the display.
From this model's manual
Verified against the Ideal/Ideal Maximiser Se installation & service manual.
DIY fix possible
Locate the reset button on the control panel.Press and hold the button until the letter 'r' appears on the display.Release the button and wait for the boiler to restart its firing sequence.
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All 40 fault codes on the Maximiser SE 42
Seeing a different code? Every code this model can display, in one place.