Failure at point L Medium

Worcester Bosch Failure at point L Fault Code

Also written as FAILUREATPOINTL — same fault.

The Worcester Bosch Failure at point L fault code means: your boiler is struggling to keep your hot water at a consistent, safe temperature, meaning it may fluctuate between being too hot or too cold.. It appears on 1 Worcester Bosch model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Domestic hot water temperature does not stabilise at 55-60°C. Involves checking Modureg DC voltage and domestic hot water sensor resistance (1.5 to 25 kohms).
Typical repair cost £120-£240 (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 Failure at point L fault code

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

Source

Worcester Bosch Failure at point L 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