0 0 High

Atmos 0 0 Fault Code

Also written as 00 — same fault.

The Atmos 0 0 fault code means: your boiler has detected an internal error during its automatic safety check and is unable to start because it cannot verify that its internal temperature sensors are reading correctly.. It appears on 1 Atmos model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Sensor fault after self-check
Typical repair cost £150-250 (including labour)

Engineer required

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

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Atmos models that show the 0 0 fault code

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

Source

Atmos 0 0 fault code information on this page is sourced and cross-checked against the official Atmos service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026