How much does it cost to fix Biasi error code Er 08 +?

Typical repair cost for the Biasi Er 08 + fault is £70-130 including labour.

Er 08 + Low

Biasi Er 08 + Fault Code

Q: What does the Biasi Er 08 + fault code mean?

Your boiler's outside temperature sensor is either broken or sending a wrong signal, which affects how efficiently the heating adjusts to the weather.

Also written as ER08 — same fault.

The Biasi Er 08 + fault code means: your boiler's outside temperature sensor is either broken or sending a wrong signal, which affects how efficiently the heating adjusts to the weather.. It appears on 2 Biasi models in our database.

Technical description: Faulty external temperature probe NTC (if fitted)

Typical repair cost £70-130 (including labour)

DIY fix possible

Check if the boiler still provides heating and hot water (it should continue to work in a failsafe mode).Inspect the external sensor on the outside of your property for any obvious signs of damage or loose wires.Try resetting the boiler to see if the error clears.

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Biasi models that show the Er 08 + fault code

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

Source

Biasi Er 08 + 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 27 April 2026