BoilerFaultCodesBaxi E125 Fault Code
The Baxi E125 fault code means: your boiler has detected that the internal mechanism responsible for circulating water around your radiators and taps is not operating correctly.. It appears on 9 Baxi models in our database.
Technical description: Pump Fault
What causes the Baxi E125 fault?
This fault occurs when the boiler detects that water is not moving through the internal pipes quickly enough to take the heat away from the burner. The most common reasons are a failed pump that can no longer push the water, or a blockage caused by a build-up of sludge and debris in the system. Because the heat cannot escape, the boiler shuts down as a safety precaution to prevent the internal components from melting or cracking.
This fault often appears during the first cold snap of autumn when a heating system that has been sitting idle all summer is suddenly forced to move heavy, settled sludge.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Baxi models that show the E125 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E125 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