BoilerFaultCodesBaxi 28 Fault Code
The Baxi 28 fault code means: your boiler is struggling to send water through your radiators or taps because it has detected an issue with the sensor that measures the water temperature as it leaves the unit.. It appears on 36 Baxi models in our database.
Technical description: Error 28 flashing
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Baxi models that show the 28 fault code
Click a model for the full fault code list and model-specific repair notes.
- 124 Combi Repair: £120-£220
- 128 Combi Repair: £120-£220
- 615 System 15 Repair: £150-300
- 618 SYSTEM Repair: £150-300
- 624 System 24 Repair: £150-300
- 818 System Repair: £150-250
- 824 SYSTEM Repair: £150-250
- 825 Combi Repair: £100-£180
- 830 COMBI Repair: £100-£180
- 836 COMBI Repair: £100-£180
- Assure Repair: £150-250
- Bahama 80e / 105e Repair: £90-160
- Combi 105 HE Repair: £120-220
- Combi 130 HE Repair: £90-160
- Combi 80 Maxflue Repair: £90-160
- Combi Instant 80/105 HE Repair: £120-200
- Duo-tec 2 Combi 28 Compact
- Duo-tec Combi ErP Repair: £150-300
- Duo-tec Combi GA Repair: £120-£200
- Duo-tec Combi HE A Repair: £150-250
- EcoBlue Repair: £150-250
- Ecoblue 12 System ErP Repair: £150-250
- Ecoblue 15 System ErP Repair: £150-250
- Ecoblue 24 System ErP Repair: £150-250
- Ecoblue 28 System ErP Repair: £150-250
- Ecoblue Advance Combi Repair: £150-250
- EcoBlue System Repair: £150-250
- Ecoblue18 System ErP Repair: £150-250
- Neta-tec Combi 24 GA
- Neta-tec Combi 28 GA
- Neta-tec Combi 33 GA
- Platinum Combi HE A Repair: £150-250
- PLATINUM COMPACT 25 COMBI Repair: £150-300
- PLATINUM COMPACT 30 COMBI Repair: £150-300
- PLATINUM COMPACT 36 COMBI Repair: £150-300
- Platinum+ 40 Combi Repair: £150-250
Source
Baxi 28 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 31 August 2026