E01.04 High

Remeha E01.04 Fault Code

Also written as E0104 — same fault.

The Remeha E01.04 fault code means: your boiler is repeatedly failing to keep its flame lit, so it has locked itself for safety to prevent a build-up of unburnt gas.. It appears on 1 Remeha 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: 5x Flame Loss Error | 5x Error of unintended Flame Loss occurance
Typical repair cost £150-350 (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 E01.04 fault code

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

Source

Remeha E01.04 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 7 July 2026