What does the Chaffoteaux 13 fault code mean?

Your boiler is gaining too much water pressure, which could eventually cause it to leak or shut down for safety.

How much does it cost to fix Chaffoteaux error code 13?

Typical repair cost for the Chaffoteaux 13 fault is £90-280 including labour.

Check that the external filling loop valves are tightly closed

Gain in pressure shown on gauge - Filling loop letting by or secondary heat exchanger leak

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

Six most common causes of dropping pressure.

Step-by-step using the filling loop.

Each noise points to a different fault.