Verified boiler fault code
Biasi E58 Fault Code (BASICA COND)
Filling function completed but pressure is above the maximum required for boiler filling.
Safety disclaimer
Fault code summary
- Manufacturer
- Biasi
- Fault code
- E58
- Fault type
- High pressure, Central heating
- Severity
- high
- Reset
- No unrestricted user reset is confirmed; high pressure after filling requires the manufacturer's procedure or qualified service.
- Applicable models
- BASICA COND 24C, BASICA COND 28C, BASICA COND 32C
Quick answer
Filling function completed but pressure is above the maximum required for boiler filling.
What does this fault code mean?
Filling function completed but pressure is above the maximum required for boiler filling.
Common causes
- Pressure remains above the maximum after the filling function
Symptoms
- E58 shown on the LCD
What can the homeowner safely check?
- Check the pressure display and do not drain or dismantle the appliance yourself.
Boiler reset information
No unrestricted user reset is confirmed; high pressure after filling requires the manufacturer's procedure or qualified service.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- A qualified engineer should assess the pressure sensor, filling control, expansion vessel and pressure relief arrangements.
Applicable boiler models
Related fault codes
- E01 — BASICA COND
Safety lockout due to failed ignition.
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EEPROM error.
Read fault code - E04 — BASICA COND
Pump circulation failure or insufficient system pressure.
Read fault code - E05 — BASICA COND
Fan-control anomaly.
Read fault code - E06 — BASICA COND
Heating NTC probe failure.
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DHW NTC probe failure.
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External NTC probe failure.
Read fault code
Manufacturer documentation
Biasi BASICA COND user manual and installation instructionsSIGNAL DISPLAYED BY THE LCD: | E58+ | Filling function of C.H. water completed, but pressure is higher than the maximum pressure for boiler filling |
Last verified
2026-09-12
Frequently asked questions
What does Biasi E58 mean?
Filling function completed but pressure is above the maximum required for boiler filling.
Can I reset a Biasi E58 fault?
No unrestricted user reset is confirmed; high pressure after filling requires the manufacturer's procedure or qualified service.