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.

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.

Shared across the Basica Cond range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
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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Related fault codes

All 39 fault codes on the Basica Combi

Seeing a different code? Every code this model can display, in one place.

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