BoilerFaultCodes E03 High
Biasi E03 Fault Code
The Biasi E03 fault code means: your boiler has shut down because it has detected that the exhaust gases are becoming too hot, which is a safety feature to prevent damage to the internal components.. It appears on 11 Biasi models in our database.
Technical description: Flue gas NTC probe intervention / Flue temperature fault
Typical repair cost £120-£250 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Biasi models that show the E03 fault code
Click a model for the full fault code list and model-specific repair notes.
- Activa Repair: £80-£220
- Advance 25C Repair: £120-250
- Antares Combi Repair: £120-250
- Antares System Repair: £120-250
- Basica Combi Repair: £120-£250
- Basica System 2022 Repair: £250-£450
- Dina Repair: £120-£250
- Inovia 2020 Repair: £120-250
- Rinnova Adaptive Combi Repair: £120-£250
- Riva Advance M96.24SM Repair: £120-£220
- Riva Plus M96.24SM Repair: £120-£280
Source
Biasi E03 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026