How much does it cost to fix Baxi error code E50?

Typical repair cost for the Baxi E50 fault is £90-160 including labour.

E50 High

Baxi E50 Fault Code

Q: What does the Baxi E50 fault code mean?

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.

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 33 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.

Typical repair cost £90-160 (including labour)

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 27 April 2026