E80-451 High

Worcester Bosch E80-451 Fault Code

Also written as E80451 — same fault.

The Worcester Bosch E80-451 fault code means: your boiler has detected a specific internal electronic fault with the valve that controls the gas supply, meaning the appliance cannot ignite safely and will remain shut down.. It appears on 1 Worcester Bosch 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 – Propane Dungs BM771 SL 040

What causes the Worcester Bosch E80-451 fault?

This fault occurs when the boiler's main control board loses communication with or detects an electrical failure within the gas valve assembly. The most common reason is an internal component failure inside the valve itself, which prevents it from opening to allow fuel into the burner for ignition.

Typical repair cost £250-£400 (including labour)

Engineer required

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

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Worcester Bosch models that show the E80-451 fault code

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

Source

Worcester Bosch E80-451 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

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