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

Typical repair cost for the Ariston 80 (ll) fault is £120-250 including labour.

80 (ll) High

Ariston 80 (ll) Fault Code

Q: What does the Ariston 80 (ll) fault code mean?

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to the system.

Also written as 80LL — same fault.

The Ariston 80 (ll) fault code means: your boiler has detected that it is running too hot and has automatically shut down to prevent damage to the system.. It appears on 4 Ariston models in our database.

Technical description: Overheating safety feature

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ariston models that show the 80 (ll) fault code

Click a model for the full fault code list and model-specific repair notes.

Clas HE 24 Repair: £120-250
Clas HE 28 Repair: £120-250
Clas HE 35 Repair: £120-250
Genus 30 Plus Repair: £120-250

Source

Ariston 80 (ll) fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026