05 High

Remeha 05 Fault Code

The Remeha 05 fault code means: your boiler has detected an issue caused by an external factor, such as a problem with your electrical power supply, an external sensor, or a communication fault from your heating controls.. It appears on 2 Remeha models 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: External influences
Typical repair cost £120-250 (including labour)

Engineer required

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

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Remeha models that show the 05 fault code

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

Source

Remeha 05 fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.

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