BoilerFaultCodesBaxi neon flashing (Pump runs) Fault Code
Also written as NEONFLASHINGPUMPRUNS — same fault.
The Baxi neon flashing (Pump runs) fault code means: your boiler has detected that water is not circulating properly through the system even though the pump is trying to run.. It appears on 3 Baxi models in our database.
Technical description: Failure during pump operation; refer to Section B.
DIY fix possible
Check that the boiler pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves and isolation valves under the boiler are fully openGently bleed air from your radiators using a radiator key
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Baxi models that show the neon flashing (Pump runs) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi neon flashing (Pump runs) fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026