50/70kW Low

Worcester Bosch 50/70kW Fault Code

Also written as 5070KW — same fault.

The Worcester Bosch 50/70kW fault code means: this code indicates your boiler is a high-output commercial-grade model and is showing its power rating rather than a fault, meaning the system is operating normally.. It appears on 3 Worcester Bosch models 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: Output 50/70kW

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 50/70kW fault code

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

Source

Worcester Bosch 50/70kW 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