BoilerFaultCodesBaxi E50 Fault Code
The Baxi E50 fault code means: your boiler's hot water sensor has stopped working, so the system is unable to tell how hot your water is and has stopped heating it for safety.. It appears on 7 Baxi models in our database.
Technical description: Hot water NTC (Negative Temperature Coefficient) error
What causes the Baxi E50 fault?
This fault occurs when the internal sensor responsible for monitoring your hot water temperature fails or sends an incorrect signal to the main control board. The most common reason is that the sensor has physically degraded over time or developed a short circuit, meaning the boiler can no longer safely verify how hot the water is. Occasionally, loose or damaged wiring between the sensor and the boiler’s computer can also trigger this shutdown.
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 E50 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E50 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