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 |