| 10001 | Unhandled state in software (engine) | System error |
| 10003 | Insufficient heap memory to construct necessary objects | System error |
| 10201 | Unexpected flame-out | System error |
| 10206 | Preheating failed, residual fuel burning for too long | Ignition failed |
| 1020B | Supply voltage is below minimum | Low voltage |
| 10A06 | Ignition failed, maximum allowed number of pump pulses | Ignition failed |
| 20005 | Unable to construct/start timer object | System error |
| 2010204 | Burner fan is not working (no tachometer signal) | Combustion fan |
| 2020204 | Ventilation fan is not working (no tachometer signal) | System error |
| 2030204 | Fuel pump output short-circuit | System error |
| 2030205 | Fuel pump not connected (no current detected on output) | System error |
| 203020A | No fuel was detected, maximum allowed number of pump pulses | Ignition failed |
| 2040205 | Water pump is missing (no load on output) | Water pump |
| 2050204 | Burner or ventilation fan power short-circuit | System error |
| 2060204 | Glow plug short-circuit | Glow plug |
| 2060205 | Glow plug missing (no current detected on output) | Glow plug |
| 2070005 | Software initialization error (watch-dog) | System error |
| 2080001 | SPI bus other errors | System error |
| 2080006 | SPI bus timeout error | System error |
| 2080008 | SPI bus busy error | System error |
| 2080208 | SPI bus read error | System error |
| 20A0207 | Water thermostat is missing water temperature data | System error |
| 20B0205 | Analog control (potentiometer) is missing | System error |
| 3000007 | Burner temperature is missing/invalid | Burner temp sensor |
| 3010007 | Air temperature is missing/invalid | Air temp sensor |
| 3010202 | Air temperature is too high | Air overheat |
| 3020007 | Water temperature is missing/invalid | Water temp sensor |
| 3020202 | Water temperature is too high | Water overheat |
| 50001 | CAN bus other errors | System error |
| 50006 | CAN bus timeout error | System error |
| 50008 | CAN bus busy error | System error |
| 7020B | Cannot start, low voltage | Low voltage |
| 7020C | Cannot start, device locked | System error |
| 7020D | Cannot start, enable input not asserted | System error |
| 7020E | Cannot start, burner temperature missing or too high | System error |
