What does the Ariston E29 fault code mean?

Your boiler is failing to register the room temperature correctly because the wall-mounted thermostat or internal sensor is disconnected.

How much does it cost to fix Ariston error code E29?

Typical repair cost for the Ariston E29 fault is £120-220 including labour.

Room sensor open circuit

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

Work through these before the call-out.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.