How much does it cost to fix Ariston error code 4 1 2?

Typical repair cost for the Ariston 4 1 2 fault is £120-250 including labour.

4 1 2 High

Ariston 4 1 2 Fault Code

Q: What does the Ariston 4 1 2 fault code mean?

Your boiler is experiencing a communication fault with a safety sensor, which has caused it to stop working to ensure your protection.

Also written as 412 — same fault.

The Ariston 4 1 2 fault code means: your boiler is experiencing a communication fault with a safety sensor, which has caused it to stop working to ensure your protection.. It appears on 1 Ariston model in our database.

Technical description: Camera sensor 2 unavailable

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 4 1 2 fault code

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

HS Premium Repair: £120-250

Source

Ariston 4 1 2 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