Double flash Blue light Emergency

Worcester Bosch Double flash Blue light Fault Code

Also written as DOUBLEFLASHBLUELIGHT — same fault.

The Worcester Bosch Double flash Blue light fault code means: your boiler has automatically turned itself off because the exhaust area is getting too hot, indicating a potential blockage or a problem with how the gases are clearing.. It appears on 1 Worcester Bosch model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Flue overheat sensor has exceeded 105°C
Typical repair cost £150-300 (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 Double flash Blue light fault code

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

Source

Worcester Bosch Double flash Blue light 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 7 July 2026