04 High

Remeha 04 Fault Code

The Remeha 04 fault code means: your boiler has lost electricity while it was already trying to deal with a previous problem, which has caused it to stop working completely as a safety precaution.. It appears on 3 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: Power failure during failure shutdown.
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 04 fault code

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

Source

Remeha 04 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 27 April 2026