F (High system water pressure) Medium

Saunier Duval F (High system water pressure) Fault Code

Q: What does the Saunier Duval F (High system water pressure) fault code mean?

Your boiler's internal water pressure is currently too high, which means it has automatically shut down to prevent damage to the system.

Q: How much does it cost to fix Saunier Duval error code F (High system water pressure)?

Typical repair cost for the Saunier Duval F (High system water pressure) fault is £80-150 including labour.

Also written as FHIGHSYSTEMWATERPRESSURE — same fault.

The Saunier Duval F (High system water pressure) fault code means: your boiler's internal water pressure is currently too high, which means it has automatically shut down to prevent damage to the system.. It appears on 1 Saunier Duval model in our database.

Technical description: At a pressure of 2.5 bar or above the high system water pressure fault will be displayed.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate a radiator in your home that is easily accessible.Place a cloth or small container under the radiator bleed valve.Open the bleed valve carefully to release water until the pressure gauge on the front of the boiler drops to between 1.0 and 1.5 bar.

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Saunier Duval models that show the F (High system water pressure) fault code

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

Thema F 30 E Plus Repair: £80-150

Source

Saunier Duval F (High system water pressure) 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