How much does it cost to fix Remeha error code 0 4?

Typical repair cost for the Remeha 0 4 fault is £180-450 including labour.

0 4 High

Remeha 0 4 Fault Code

Q: What does the Remeha 0 4 fault code mean?

Your boiler has experienced a power disruption while it was already trying to report a serious internal error, causing it to lock itself for safety.

Also written as 04 — same fault.

The Remeha 0 4 fault code means: your boiler has experienced a power disruption while it was already trying to report a serious internal error, causing it to lock itself for safety.. It appears on 3 Remeha models in our database.

Technical description: Control fault: Voltage failure when malfunction causes interlock.

What causes the Remeha 0 4 fault?

This fault occurs when the boiler experiences a sudden power cut or electrical surge at the exact moment it was trying to register a different internal error. This creates a conflict in the boiler's memory, as the control board cannot safely confirm why the system shut down. It is essentially a safety 'double-lock' that prevents the boiler from firing up until the electrical integrity of the control unit is verified.

Typical repair cost £180-450 (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 0 4 fault code

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

Source

Remeha 0 4 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