BoilerFaultCodesTechnical description
Fan and water pump return water
What causes this fault?
This status occurs when the boiler's internal computer is verifying that the pump is moving enough water and the fan is spinning at the right speed before ignition. It is essentially a safety check to ensure the heat exchanger won't overheat once the flame starts. If the display stays on this code for a long time, it usually means the pump is struggling to move water or a sensor is providing an inaccurate reading.
DIY fix possible
Check that your radiator valves are openEnsure your boiler pressure is between 1.0 and 1.5 barWait a few minutes to see if the code clears and the boiler starts automatically
Find a Gas Safe engineer
Search the official register →