8/2/6 Low

Worcester Bosch 8/2/6 Fault Code

Also written as 826 — same fault.

The Worcester Bosch 8/2/6 fault code means: your boiler's outside temperature sensor is sending a faulty signal, which may cause your heating system to work less efficiently or struggle to reach your desired room temperature.. It appears on 1 Worcester Bosch model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: RC35-HK1 temperature sensor. The external temperature sensor of the remote control (control unit) of heating circuit 1 is defective.
Typical repair cost £120-200 (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 8/2/6 fault code

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

Source

Worcester Bosch 8/2/6 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