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Saunier Duval Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

• F1 The F1 fault code on a Saunier Duval boiler indicates that the appliance has failed to establish a flame after one or… Read more →
• F10 The F10 code indicates that the boiler's central heating return thermistor (NTC sensor) has developed a fault. This… Read more →
• F22 The F22 code appears when your Saunier Duval boiler detects that the water pressure in the heating circuit has dropped… Read more →
• F23 The F23 code appears when your Saunier Duval boiler detects that the temperature difference between the flow pipe… Read more →
• F28 The F28 code means your Saunier Duval boiler has tried to light the burner three times in a row and failed every time.… Read more →