What does the Ariston 40-50-80 (ll-ll-ll) fault code mean?

Your boiler is struggling to accurately detect the temperature of your hot water supply because a connection to a heat sensor has been interrupted.

How much does it cost to fix Ariston error code 40-50-80 (ll-ll-ll)?

Typical repair cost for the Ariston 40-50-80 (ll-ll-ll) fault is £120-200 including labour.

Thermistor «comfort» (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.

Almost always a stuck diverter valve on combis.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.