BoilerFaultCodesTechnical description
Air purge mode
What causes this fault?
This code appears because air has been detected within the boiler's internal heat exchanger or pipework, often following a period of inactivity or after the system has been drained and refilled. To protect the components from overheating, the boiler automatically enters a cycle to vent this trapped air. It is a protective measure rather than a breakdown, ensuring the water can circulate freely and safely through the appliance.
This is most common in autumn when homeowners turn their heating back on for the first time or after radiators have been bled in preparation for winter.
DIY fix possible
Wait for approximately 8 to 15 minutes for the automated cycle to complete naturally.Check that your radiator valves are open to help move air through the system.Monitor the boiler display; once the code disappears, normal operation should resume automatically.