What does the Atag Error 02 fault code mean?

Your boiler is failing to light the gas, meaning it cannot produce any heat or hot water.

How much does it cost to fix Atag error code Error 02?

Typical repair cost for the Atag Error 02 fault is £120-350 including labour.

Check if other gas appliances, like a hob, are working to ensure gas supply is active

no flame-forming

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.