BAXI Duo-tec 2 Combi 24 GA Boiler Fault Codes
Error Codes
1. If a fault occurs on the boiler an error code may be shown by the facia display.
2. The codes are a flashing number, either two or three digit, preceded by the symbol E :-
- E followed by 20, 28, 40, 160 or 321 indicates possible faulty components.
- E followed by 55 (after replacing R.D.S.) indicates calibration required (Section 14.2).
- E110 indicates overheat of the primary system water.
- E117 is displayed when the primary water pressure is greater than 2.7 bar.
- E118 is displayed when the primary water pressure is less than 0.5 bar.
- E133, 134 and 135 indicate that the gas supply has been interrupted, ignition has failed or the flame has not been detected.
- E128 is displayed if there has been a flame failure during normal operation.
- E125 is displayed in either of two situations:-
i) If between 15 and 30 seconds of the burner lighting the boiler temperature has not changed by 1°C.
ii) If within 10 minutes of the burner lighting the boiler actual temperature twice exceeds the selected temperature by 30°. In these instances poor primary circulation is indicated.
3. By pressing the 'Reset' button for 1 to 3 seconds when E110, 125, 133, 134, 135, 09, 15, 128 & 384 are displayed it is possible to relight the boiler.
4. If this does not have any effect, or the codes are displayed regularly further investigation is required.
| Code | Fault |
| E09 | Gas Valve Connection Cable |
| E15 | Gas Valve Fault |
| E20 | Central Heating NTC Fault |
| E28 | Flue NTC Fault |
| E40 | Central Heating Return NTC Fault |
| E55 | Calibration Required |
| E109 | Pre-circulation Fault |
| E110 | Safety Thermostat Operated |
| E117 | Primary System Water Pressure Too High |
| E118 | Primary System Water Pressure Too Low |
| E125 | Circulation Fault (Primary) |
| E128 | Flame Failure |
| E130 | Flue NTC Operated |
| E133 | Interruption Of Gas Supply or Flame Failure |
| E134 | Elapsed Time - Gas Valve Open Without Gas |
| E135 | Interruption Of Gas Supply (Internal Error) |
| E154 | Flow/Return Sensor Temperature Test |
| E160 | Fan or Fan Wiring Fault |
| E270 | Circulation Fault (Dry Fire) |
| E321 | Hot Water NTC Fault |
| E384 | False Flame |