How much does it cost to fix Biasi error code Er 13?

Typical repair cost for the Biasi Er 13 fault is £120-£350 including labour.

Er 13 High

Biasi Er 13 Fault Code

Q: What does the Biasi Er 13 fault code mean?

Your boiler has detected that the water is getting too hot too quickly because it isn't circulating through the system properly.

Also written as ER13 — same fault.

The Biasi Er 13 fault code means: your boiler has detected that the water is getting too hot too quickly because it isn't circulating through the system properly.. It appears on 14 Biasi models in our database.

Technical description: DT delivery-return >40K

Typical repair cost £120-£350 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barGently bleed air from your radiators using a radiator key

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Biasi models that show the Er 13 fault code

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

Source

Biasi Er 13 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 31 August 2026