08 Medium

Saunier Duval 08 Fault Code

The Saunier Duval 08 fault code means: your boiler is having trouble reading the temperature of the internal store of hot water, which may mean your hot water tap takes slightly longer to heat up or isn't as consistent.. It appears on 5 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 £150-250 (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 31 August 2026