E34 High

Ferroli E34 Fault Code

The Ferroli E34 fault code means: your boiler is failing to switch on because the electricity supply reaching it is too weak to operate the internal controls safely.. It appears on 1 Ferroli 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: Mains voltage below 180V
Typical repair cost £100-250 (including labour)

Engineer required

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

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Ferroli models that show the E34 fault code

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

Source

Ferroli E34 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026