What does the Navien E046 fault code mean?

Your boiler has detected that parts of its internal heating system are getting dangerously hot and has shut itself down to prevent damage.

How much does it cost to fix Navien error code E046?

Typical repair cost for the Navien E046 fault is £150-300 including labour.

Abnormal operation: Heat exchanger overheating sensor

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.

Almost always a stuck diverter valve on combis.

Work through these before the call-out.