| A99 | Generic fault: hardware or software error of the PCB. | The PCB (NE 112) shows an internal hardware/firmware fault; check power supply/grounding and perform manual calibration. If it persists, replace the board. |
| A98 | Too many software errors or error appeared after replacing the card; requires calibration. | Software/parameterisation error in the PCB after replacement or accumulation of faults; check and execute AUTO SETUP/full manual calibration. If it reappears, check/replace the control board. |
| F50 | Internal error of the DBMxx control board. | Fault in the control module integrated in the PCB; check the earth connection and power supply. If the error persists, replace the board/controller. |
| F51 | Internal error of the DBMxx control board. | Controller fault in the PCB; measure ground/power supply and, if not recovered, replace the PCB/controller. |
| A61 | PCB fault AGC01: internal error. | AGC01 controller fault on the PCB; check the earth connection and continuity. If it persists, replace the board. |
| F61 | PCB fault AGC01: internal error. | AGC01 controller fault located on the PCB; check earth/power supply and, if not resolved, replace the board. |
| A63 | Control board fault (ABM03): internal error. | The ABM03 controller of the PCB fails (firmware/CPU); check the ground and perform a reset/calibration. If it continues, replace the board. |
| F66 | Controller fault: internal error/firmware not loaded correctly. | Controller anomaly in the PCB (ABM03/041049G0); check grounding and reload/calibrate. If it reappears, replace the board. |
| A23 | PCB parameter fault. | Incorrect/corrupt PCB parameters; enter the technical menu to verify/restore parameters or recalibrate. If not corrected, reprogram or replace the PCB. |
| A24 | PCB parameter fault. | Incorrect parameterization of the PCB; verify/adjust board parameters and recalibrate. If it reappears, reprogram or replace the PCB. |
| A02 | Flame signal with burner off (electrode or PCB). | The PCB may give a false ionisation reading or generate a spurious signal; check the electrode/wiring and, if the reading is correct and the fault persists, the PCB is the cause. |