Welcome to the UK Boiler Error Codes & Diagnostics Hub
The most comprehensive, continuously updated database of fault codes for the UK’s leading boiler manufacturers. Select your brand from the navigation menu above, or instantly find your specific error code using our real-time diagnostic search engine below.
Important Safety Disclaimer The information provided on this website is for diagnostic and educational purposes only. Modern boilers contain complex internal electronics and combustible gas components. If your fault code indicates an issue beyond simple pressure top-ups or system resets, it is strictly required by UK law to contact a registered Gas Safe Engineer. Never attempt to remove the boiler casing or repair gas-carrying components yourself.