Fault on DHW sensor Medium

Heatline Fault on DHW sensor Fault Code

Also written as FAULTONDHWSENSOR — same fault.

The Heatline Fault on DHW sensor fault code means: your boiler is struggling to detect the temperature of the water coming out of your hot taps, which means it cannot heat your hot water correctly.. It appears on 2 Heatline models 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: Fault on DHW sensor
Typical repair cost £120-200 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Heatline models that show the Fault on DHW sensor fault code

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

Source

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

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