How much does it cost to fix Atag error code Err.5?

Typical repair cost for the Atag Err.5 fault is £120-250 including labour.

Err.5 High

Atag Err.5 Fault Code

Q: What does the Atag Err.5 fault code mean?

Your boiler has detected a recurring internal fault that is preventing it from operating safely, requiring a professional to reset and troubleshoot the control system.

Also written as ERR5 — same fault.

The Atag Err.5 fault code means: your boiler has detected a recurring internal fault that is preventing it from operating safely, requiring a professional to reset and troubleshoot the control system.. It appears on 2 Atag models in our database.

Technical description: Predecessing error 5

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 →

Atag models that show the Err.5 fault code

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

Source

Atag Err.5 fault code information on this page is sourced and cross-checked against the official Atag service / installation manuals for each affected model.

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