What does the Chaffoteaux 10.iv fault code mean?

Your boiler is struggling to move heat away efficiently and is turning itself on and off rapidly to prevent overheating due to a blockage inside.

How much does it cost to fix Chaffoteaux error code 10.iv?

Typical repair cost for the Chaffoteaux 10.iv fault is £150-350 including labour.

Rapid cycling high/low or high/low/off - Blocked heat exchanger

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.

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.