| A02 | Flame signal present with burner off | The PCB may falsify the ionisation reading (detection circuit on the board), maintaining a flame signal without combustion. Verify by measuring ionisation current and testing with the electrode/cable disconnected; if it persists, reprogram or replace the board. |
| F04 | Anomaly in the parameters of the control board | Corrupted or incorrectly set parameters of the PCB (EEPROM/configuration) after replacement or loss of programming. Verify and reprogram service parameters; if it does not save or reappears, replace the PCB. |
| F05 | Anomaly in the parameters of the control board | Incorrect PCB calibration/parameter settings (or data corruption) causing fault diagnosis. Check/adjust model parameters with technical tool/menu; if not corrected or does not accept recording, defective PCB. |
| F07 | Anomaly in the parameters of the control board | Inconsistent PCB configuration with the equipment or damaged memory. Check and reprogram the manufacturer's Pxx parameters; if the error persists after reprogramming, replace the PCB. |
| A23 | Anomaly in the parameters of the control board | Incorrect internal parameters of the PCB (model/gas/curves), usually after a board change or deletion. Reprogram parameters according to the service manual; if it does not stabilize, the PCB is damaged. |
| A24 | Anomaly in the parameters of the control board | Fault/error in the main board parameterization or memory corruption. Check and re-record factory parameters; if the fault persists, replace the PCB. |