Main Boiler Error Codes
Error codes are shown on Main boilers to indicate that the product has an issue. Below you will find a list of Main boiler error codes for all current Main products and we’ve even given you guidance (where available) on the action you need to take.
| Error Code | Possible Fault |
|---|---|
| E09 | Gas valve connection error |
| E15v | Gas valve error |
| E20 | Central heating negative thermistor coefficient (NTC) sensor error |
| E28 | Flue negative thermistor coefficient (NTC) sensor error |
| E40 | Central heating return sensor error |
| E83 | Communication error |
| E109 | Pre-circulation fault |
| E110 | Safety thermostat operated |
| E118 | Primary system water pressure too low |
| E125 | Circulation error |
| E128 | Flame error |
| E130 | Flue negative thermistor coefficient (NTC) sensor operated |
| E133 | Interruption of gas supply or flame error |
| E135 | Interruption of gas supply |
| E154 | Flow return sensor temperature test |
| E160 | Fan or fan wiring error |
| E270 | Circulation fault (dry fire) |
| E321 | Hot water negative thermistor coefficient (NTC) error |
| E384 | False flame |
| Error Code | Possible Fault |
|---|---|
| E09 | Gas valve connection error |
| E15v | Gas valve error |
| E20 | Central heating negative thermistor coefficient (NTC) sensor error |
| E28 | Flue negative thermistor coefficient (NTC) sensor error |
| E40 | Central heating return sensor error |
| E83 | Communication error |
| E109 | Pre-circulation fault |
| E110 | Safety thermostat operated |
| E118 | Primary system water pressure too low |
| E125 | Circulation error |
| E128 | Flame error |
| E130 | Flue negative thermistor coefficient (NTC) sensor operated |
| E133 | Interruption of gas supply or flame error |
| E135 | Interruption of gas supply |
| E154 | Flow return sensor temperature test |
| E160 | Fan or fan wiring error |
| E270 | Circulation fault (dry fire) |
| E321 | Hot water negative thermistor coefficient (NTC) error |
| E384 | False flame |
The error code E133 on the Main boiler simply means that the condensate pipe is frozen. This issue usually occurs during the cold winter months as the condensate pipe leads outside. Luckily this is an issue that can be resolved fairly quickly without the need for an engineer. You just need to thaw out the condensate pipe.
| Error Code | Possible Fault |
|---|---|
| 1 Green Flash | Boiler temp reached |
| 2 Green Flash | Boiler temp reached |
| 3 Green Flash | Temporary Flame Loss |
| 4 Green Flash | Communication error between PCB and Control |
| 5 Green Flash | Parameter Error On PSU/PCB |
| 6 Green Flash | Miscellaneous Error |
| 1 Red Flash | Sensor Error; Sensor Fault, Temperature Fault or Flow Fault |
| 2 Red Flash | Boiler overheat tripped |
| 3 Red Flash | Ignition fault. Boiler has attempted to light 5 times and failed |
| 4 Red Flash | Fan Fault |
| 5 Red Flash | Parameter or PSU Error |
| 6 Red Flash | Miscellaneous |
