What does the Chaffoteaux 7.iv fault code mean?

Your boiler has developed an internal leak between its two water systems, causing the pressure to rise and trigger a safety release valve.

How much does it cost to fix Chaffoteaux error code 7.iv?

Typical repair cost for the Chaffoteaux 7.iv fault is £250-450 including labour.

Safety valve discharges - Secondary heat exchanger (water to water) internal water 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.

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.