Biasi E03 Fault Code (BASICA COND)

Safety disclaimer

Fault code summary

Manufacturer

Biasi

Fault code

E03

Fault type

PCB/electronics, Electrical

Severity

high

Reset

No specific homeowner reset is confirmed in the fault table; arrange qualified diagnosis if the code persists.

Applicable models

BASICA COND 24C, BASICA COND 28C, BASICA COND 32C

Quick answer

EEPROM error.

What does this fault code mean?

EEPROM error.

Common causes

• EEPROM/control-memory error

Symptoms

• E03 shown on the LCD

What can the homeowner safely check?

• Record the code and switch the appliance off only using normal controls if instructed; do not open the casing.

Boiler reset information

No specific homeowner reset is confirmed in the fault table; arrange qualified diagnosis if the code persists.

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 diagnose the control board and EEPROM fault.

Applicable boiler models

• BASICA COND 24C
• BASICA COND 28C
• BASICA COND 32C

Related fault codes

• E01 — BASICA COND

  Safety lockout due to failed ignition.

  Read fault code
• E02 — BASICA COND

  Lockout due to the safety thermostat.

  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.

  Read fault code
• E07 — BASICA COND

  DHW NTC probe failure.

  Read fault code
• E08 — BASICA COND

  External NTC probe failure.

  Read fault code
• E09 — BASICA COND

  Flue-gas NTC probe interruption.

  Read fault code

Manufacturer documentation

SIGNAL DISPLAYED BY THE LCD: | E03+ | EEPROM error |

Last verified

2026-09-12

Frequently asked questions