BoilerFaultCodesWarmflow E01 Fault Code
The Warmflow E01 fault code means: your boiler's burner has stopped working because it cannot light the fuel, meaning your heating and hot water have turned off for safety.. It appears on 3 Warmflow models in our database.
Technical description: Burner Lockout — no fuel supply, air in fuel lines, burner fault; consult Service Engineer; press illuminated reset button on burner
DIY fix possible
Check that your heating oil tank has enough fuelEnsure the oil supply valve is fully openPress the illuminated reset button on the burner once to try and restart the system
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Warmflow models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmflow E01 fault code information on this page is sourced and cross-checked against the official Warmflow service / installation manuals for each affected model.
- Warmflow Agentis Boilerhouse manual (PDF)
- Warmflow Agentis External manual (PDF)
- Warmflow Agentis Internal manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026