What does the Saunier Duval F1 fault code mean?

Your boiler is attempting to start but failing to keep the flame lit, which means it will stop providing heating and hot water for safety reasons.

How much does it cost to fix Saunier Duval error code F1?

Typical repair cost for the Saunier Duval F1 fault is £120-250 including labour.

The burner lights, then goes out. The flame is not spreading across the whole burner and is not reaching the sensing electrode or no flame detected.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Almost always a stuck diverter valve on combis.

Older boilers — thermocouple, draught, gas supply.

7 signs repair isn't worth it anymore.