BoilerFaultCodesBaxi E193 Fault Code
The Baxi E193 fault code means: your boiler has detected that water is not circulating correctly through the system before the burner ignites.. It appears on 7 Baxi models in our database.
Technical description: Pre-circulation error
What causes the Baxi E193 fault?
This fault occurs when the boiler's internal sensors detect that water isn't moving through the unit quickly enough before it attempts to fire up. The most common reason is a seized or failing circulation pump, though it can also be caused by air trapped in the heat exchanger or a blockage in the system pipework. Because the heat cannot be carried away from the burner, the boiler shuts down to prevent internal damage from overheating.
This error is frequently seen at the start of autumn when heating systems are turned on for the first time after summer, as pump components can seize during long periods of inactivity.
DIY fix possible
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gaugeEnsure all radiator valves and isolation valves under the boiler are fully openBleed your radiators to remove any trapped air pockets that may be blocking flow
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Baxi models that show the E193 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E193 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
- Baxi Duo-tec Combi ErP manual (PDF)
- Baxi Duo-tec Combi GA manual (PDF)
- Baxi Duo-tec Combi HE manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026