What does the Atag 133 fault code mean?

Your boiler has tried to start several times but cannot light a flame, meaning you will not have any heating or hot water until it is fixed.

How much does it cost to fix Atag error code 133?

Typical repair cost for the Atag 133 fault is £100-£350 including labour.

Check if your gas supply is active by testing other gas appliances like a hob

No flame after 5 ignition attempts

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.