Low
ON on Biasi Riva Compact HE M96a

Your boiler is operating normally and is currently responding to a request for heating or hot water.

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.

What the manual says

Manufacturer manual

Boiler ON condition (function control in C.H. or D.H.W. position).

From this model's manual
Verified against the Biasi Riva Compact 24s installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check your thermostat or programmer to see if they are calling for heatRun a hot tap to see if the boiler responds normallyNo action is required as this is a status indicator, not a fault code

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Avoid the next call-out bill

A cover plan would handle faults like ON: no call-out fees, no surprise bills.

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