BoilerFaultCodesBaxi © neon flashing Fault Code
Also written as NEONFLASHING — same fault.
The Baxi © neon flashing fault code means: your boiler has detected a problem with its internal temperature sensors, which means it cannot accurately tell how hot the water is and has stopped working for safety.. It appears on 13 Baxi models in our database.
Technical description: Temperature sensor fault (CH or DHW NTC)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Baxi models that show the © neon flashing fault code
Click a model for the full fault code list and model-specific repair notes.
- 105e Repair: £120-250
- Combi 130e
- Combi 80e
- Combi 80e Repair: £180-£350
- Combi 80e Repair: £90-160
- Combi 80e Repair: £120-£350
- Combi 80e Repair: £120-300
- Combi Elite
- Combi Elite Repair: £180-350
- Combi Elite Repair: £90-160
- Combi Elite Repair: £120-300
- Combi Elite Repair: £90-280
- System Repair: £100-350
Source
Baxi © neon flashing fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026