BoilerFaultCodesBiasi Frost protect operation Fault Code
Also written as FROSTPROTECTOPERATION — same fault.
The Biasi Frost protect operation fault code means: your boiler has automatically activated its winter protection mode to stop internal pipes from freezing while the weather is cold.. It appears on 3 Biasi models in our database.
Technical description: Lamp 3 ON
DIY fix possible
Check if the room thermostat is set low or if the heating has been turned off for a long period.Ensure your heating controls are set to a temperature that prevents the house from becoming too cold.Monitor the boiler; this status should clear automatically once the internal components warm up or the ambient temperature rises.
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Biasi models that show the Frost protect operation fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi Frost protect operation fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
- Biasi Riva Compact 24S (M90E.24S) manual (PDF)
- Biasi Riva Compact HE M96a manual (PDF)
- Biasi Riva Compact HE MK2 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026