Er08 Low

Biasi Er08 Fault Code

Also written as ER08 — same fault.

The Biasi Er08 fault code means: your boiler is having trouble communicating with an outdoor sensor used to monitor the weather, but it should still be able to provide heating and hot water.. 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: Faulty external temperature probe NTC (if fitted)
Typical repair cost £90-160 (including labour)

DIY fix possible

Check if an external temperature sensor is actually installed on an outside wall.Inspect the sensor for any obvious physical damage or loose wiring.Restart the boiler by turning the selector knob to the 'Reset' position for five seconds.

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Biasi models that show the Er08 fault code

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

Source

Biasi Er08 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