Emergency
E58 on Biasi Basica Combi

Your boiler has been filled with too much water, causing the system pressure to rise above the safe operating limit.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

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

What the manual says

Manufacturer manual

Filling function of C.H. water completed, but pressure is higher than the maximum pressure for boiler filling.

From this model's manual
Verified against the Biasi Basica Combi installation & service manual, page 12.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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