Verified boiler fault code

Biasi E02 Fault Code (BASICA COND)

Lockout due to the safety thermostat.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer
Biasi
Fault code
E02
Fault type
Overheating, Safety lockout, Temperature sensor
Severity
high
Reset
Use only the manufacturer-described reset control if the user manual permits it; do not repeatedly reset a safety lockout.
Applicable models
BASICA COND 24C, BASICA COND 28C, BASICA COND 32C

Quick answer

Lockout due to the safety thermostat.

What does this fault code mean?

Lockout due to the safety thermostat.

Common causes

  • Safety thermostat operation

Symptoms

  • E02 shown on the LCD
  • Boiler lockout

What can the homeowner safely check?

  • Record the code and do not remove the casing or attempt to reset a safety thermostat internally.

Boiler reset information

Use only the manufacturer-described reset control if the user manual permits it; do not repeatedly reset a safety lockout.

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 investigate the safety thermostat, circulation and temperature-control circuit.

Applicable boiler models

Related fault codes

Manufacturer documentation

Biasi BASICA COND user manual and installation instructions

SIGNAL DISPLAYED BY THE LCD: | E02+ | Lockout due to safety thermostat |

Last verified

2026-09-12

Frequently asked questions

What does Biasi E02 mean?

Lockout due to the safety thermostat.

Can I reset a Biasi E02 fault?

Use only the manufacturer-described reset control if the user manual permits it; do not repeatedly reset a safety lockout.