Sensor Fault (Hot Water) Medium

Baxi Sensor Fault (Hot Water) Fault Code

Also written as SENSORFAULTHOTWATER — same fault.

The Baxi Sensor Fault (Hot Water) fault code means: your boiler has detected a problem with the sensor that monitors hot water temperature, which means you may have inconsistent or no hot water.. It appears on 1 Baxi model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: When the 30° neon is illuminated a fault on the domestic hot water temperature sensor is indicated.
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 Sensor Fault (Hot Water) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi Sensor Fault (Hot Water) 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