Boiler temperature below 8°C Low

Worcester Bosch Boiler temperature below 8°C Fault Code

Also written as BOILERTEMPERATUREBELOW8C — same fault.

The Worcester Bosch Boiler temperature below 8°C fault code means: your boiler has detected that the water inside it is very cold and has automatically activated its internal frost protection system to prevent the pipes from freezing.. 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: Run autofroststat function

DIY fix possible

Ensure your heating controls are set to a temperature that keeps the boiler active during very cold weatherKeep your heating on a low constant setting if temperatures are near freezingDo not switch off the power supply to the boiler

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Worcester Bosch models that show the Boiler temperature below 8°C fault code

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

Source

Worcester Bosch Boiler temperature below 8°C 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