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 sensed that water is becoming too hot too quickly, usually because it cannot circulate correctly through your radiators or pipes.

Also written as ER13 — same fault.

The Biasi Er 13 + fault code means: your boiler has sensed that water is becoming too hot too quickly, usually because it cannot circulate correctly through your radiators or pipes.. It appears on 2 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 bar on the gaugeCheck if the condensate pipe is frozen if the weather is extremely coldReset the boiler using the control dial

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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 27 April 2026