Your Main combi, system or heat-only boiler may sometimes show an error code starting with an ‘E’ and followed by two or three numbers. Some problems are easy to resolve and can be fixed by you, while others will require a Gas Safe registered engineer. When an error code appears on your Main boiler, you may see also a spanner symbol or an ‘R’ symbol. All ‘R’ fault errors that show on your boiler can be reset by simply pressing the reset button. If you see a spanner symbol, you must contact a heating engineer.
Below you will find a list of Main combi, system and heat-only boiler error codes and a description of each fault.
Main Eco Compact Combi, System and Heat Boiler Fault Codes
| FAULT CODE | DESCRIPTION OF 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 |
| E83 | Communication error |
| E109 | Pre-circulation fault |
| E110 | Safety thermostat operated |
| 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 |
| 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 |
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