How much does it cost to fix Saunier Duval error code Low water pressure LED?

Typical repair cost for the Saunier Duval Low water pressure LED fault is £80-150 including labour.

Low water pressure LED High

Saunier Duval Low water pressure LED Fault Code

Q: What does the Saunier Duval Low water pressure LED fault code mean?

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

Also written as LOWWATERPRESSURELED — same fault.

The Saunier Duval Low water pressure LED fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.. It appears on 1 Saunier Duval model in our database.

Technical description: Flashing - check system pressure, re-pressurise if necessary, or check/replace low water pressure switch

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the two small taps (filling loop) usually found underneath the boilerOpen the taps slowly to let fresh water into your heating system until the pressure gauge needle reaches the green zone (typically 1.0 to 1.5 bar)Close both taps firmly to prevent over-pressurisation

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Saunier Duval models that show the Low water pressure LED fault code

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

SD 30e Repair: £80-150

Source

Saunier Duval Low water pressure LED 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