| A02 | Flame signal present with burner off. | The PCB (ABM01A board) may give a false ionization reading due to a fault in the detection circuit or internal leakage; check wiring/electrode and, if it persists, measure ionization current and test/reprogram or replace the PCB. |
| F04 | Anomaly in the parameters of the control board. | PCB parameters misconfigured/corrupted (EEPROM); check in technical menu and reprogram/autoset (e.g., parameters b**/q**); if it doesn't save or reappears, the PCB is damaged and must be replaced. |
| F05 | Anomaly in the parameters of the control board. | Incorrect programming/parameterization of the PCB or internal fault of the control board; verify and correct parameters in the technical menu or load default values; if the anomaly persists after reprogramming, replace the PCB. |
| F07 | Anomaly in the parameters of the control board. | Parameter/EEPROM error in the PCB causing control lockout; verify and reprogram parameters in the technical menu; if it reappears, confirm with temporary card substitution or replace the PCB. |
| A23 | Anomaly in the parameters of the control board. | Incorrect programming/parameterization of the PCB (e.g., factory settings lost); check by performing a reset/programming of the board and, if not corrected, update or replace the PCB. |
| A24 | Anomaly in the parameters of the control board. | Fault/alteration of the PCB programming that requires reparameterization or loading correct values; if the board does not allow recording or the error returns, replace the PCB. |