What does the Atag b25 fault code mean?

Your boiler is heating up too quickly and has shut itself down to prevent damage, usually because water isn't flowing through the system correctly.

How much does it cost to fix Atag error code b25?

Typical repair cost for the Atag b25 fault is £120-£350 including labour.

Check that at least two or three radiator valves are fully open

Boiler block: Temperature rise too fast

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

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.