E58 Emergency

Biasi E58 Fault Code

The Biasi E58 fault code means: your boiler has too much water pressure inside the system after being topped up, which has caused it to lock out for safety.. It appears on 2 Biasi models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Filling function of C.H. water completed, but pressure is higher than the maximum pressure for boiler filling.
Typical repair cost £0-120 (including labour)

DIY fix possible

Ensure the blue filling loop taps under the boiler are fully turned off.Locate a radiator bleed valve and use a key to release water into a cloth or container until the pressure gauge drops to 1.5 bar.Reset the boiler to clear the error code.

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Biasi models that show the E58 fault code

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

Source

Biasi E58 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