What does the Saunier Duval 02 fault code mean?

Your boiler is failing to light the internal flame, which means it cannot produce any heat or hot water.

How much does it cost to fix Saunier Duval error code 02?

Typical repair cost for the Saunier Duval 02 fault is £120-250 including labour.

There is no flame ionisation. This fault code may appear on commissioning the boiler and may simply due to the presence of air in the gas line.

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.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.