Low
Fan On on Baxi Solo 3 PFL

Your boiler is operating normally, and this indicator light simply shows that the internal fan is running as expected to vent the system.

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

Indicator light - Check if fan and pressure switch plug is connected and if there is mains at the fan connection

From this model's manual
Verified against the Baxi Solo 3 Pfl 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.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Avoid the next call-out bill

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

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