Er08+ Low

Biasi Er08+ Fault Code

Also written as ER08 — same fault.

The Biasi Er08+ fault code means: your boiler's outside temperature sensor has developed a fault or is sending incorrect data, which might stop the heating from adjusting correctly to the weather.. It appears on 1 Biasi model 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)

Engineer required

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

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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 27 April 2026