What does the Navien 110 fault code mean?

Your boiler is failing to light the flame properly, which means it cannot produce heating or hot water until the ignition system is checked.

How much does it cost to fix Navien error code 110?

Typical repair cost for the Navien 110 fault is £120-250 including labour.

Error 110

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.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.