1 08 High

Chaffoteaux 1 08 Fault Code

Also written as 108 — same fault.

The Chaffoteaux 1 08 fault code means: your boiler has detected that the water pressure inside your heating system is too low to operate safely.. It appears on 1 Chaffoteaux model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Manque d’eau (demande de remplissage)
Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop (usually a silver braided hose with one or two valves) connected to the underside of the boiler or nearby pipework.Open the valve(s) slowly to allow mains water into the system while watching the pressure gauge on the front of the boiler.Stop filling when the needle reaches the green zone, typically between 1.0 and 1.5 bar, and ensure the valve is fully closed.

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Chaffoteaux models that show the 1 08 fault code

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

Source

Chaffoteaux 1 08 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

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