DHW NTC fault Medium

Pro DHW NTC fault Fault Code

Also written as DHWNTCFAULT — same fault.

The Pro DHW NTC fault fault code means: your boiler's hot water sensor has failed, meaning the system cannot accurately measure how hot your water is and has stopped heating it for safety.. It appears on 1 Pro 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: ON at 50 °C | OFF at 55 °C
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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Pro models that show the DHW NTC fault fault code

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

Source

Pro DHW NTC fault fault code information on this page is sourced and cross-checked against the official Pro service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026