C.h. operation Low

Biasi C.h. operation Fault Code

Also written as CHOPERATION — same fault.

The Biasi C.h. operation fault code means: your boiler is currently running in central heating mode and this light is a normal status indicator rather than a fault.. It appears on 3 Biasi 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: Lamp 1 ON

DIY fix possible

Check if your thermostat or programmer is calling for heatAdjust your temperature settings if you do not want the heating onNo action is required if your radiators are warming up as intended

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Biasi models that show the C.h. operation fault code

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

Source

Biasi C.h. operation fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026