08 Medium

Saunier Duval 08 Fault Code

The Saunier Duval 08 fault code means: your boiler is struggling to accurately measure the temperature of the water it keeps ready for your taps, which may cause your hot water to fluctuate in temperature or stop working entirely.. It appears on 8 Saunier Duval 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: Micro accumulation vessel NTC fault
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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Saunier Duval models that show the 08 fault code

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

Source

Saunier Duval 08 fault code information on this page is sourced and cross-checked against the official Saunier Duval service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026