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If the control panel shows error code '3' in a lockout condition: Reset the boiler by turning the control knob fully anti-clockwise to the RESET/STAND-BY position and then back to anywhere between the '+' and '-' wishing TWO seconds. This should reset the boiler and continue to function normally
If the boiler continues to give you error code '3' you will need to contact
Service Help line: 08450 710780
Let me know if I can be of further assistance.