E83---129 High

Biasi E83---129 Fault Code

Also written as E83129 — same fault.

The Biasi E83---129 fault code means: your boiler is unable to safely control the flow of gas required to light the burner, meaning your heating and hot water will not work.. It appears on 1 Biasi 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: Gas valve
Typical repair cost £180-£320 (including labour)

Engineer required

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

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Biasi models that show the E83---129 fault code

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

Source

Biasi E83---129 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

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