| A02 | Flame signal present with burner off | The ionization circuit on the PCB interprets a flame when there is none (noise/current leakage or PCB fault). Check the electrode and wiring; if the signal is correct and the issue persists, check/replace the PCB. |
| A23 | Anomaly in the parameters of the control board | Internal parameters of the PCB misconfigured/corrupted (NVRAM). Check and reprogram service parameters; if they are not saved or reappear, replace the PCB. |
| A24 | Anomaly in the parameters of the control board | Incorrect PCB configuration/parameter table. Access the technical menu and load the correct values; if the fault persists after reprogramming, the PCB is defective. |
| A26 | Anomaly in the parameters of the control board | Corruption/incorrect adjustment of PCB parameters. Reprogram parameters with technical tool/menu; if it does not accept changes, replace the PCB. |
| F20 | Anomaly in the parameters of the control board | PCB parameters out of specification. Verify/load factory values; if it reappears after correct loading, probable memory fault of the PCB. |
| F21 | Anomaly in the parameters of the control board | Mismatch/damage in the PCB parameter settings. Check values and reprogram; if not corrected, replace the board. |
| F40 | Anomaly in the parameters of the control board | Internal configuration error of the PCB. Readjust parameters to model specification; if the error returns, defective PCB memory. |
| F47 | Anomaly in the parameters of the control board | Table of parameters for the damaged or incompatible PCB. Load correct/update parameters; if it doesn't stabilize, replace the PCB. |
| A61 | ABM03 control unit anomaly (internal error) | Internal fault of the ABM03 controller integrated in the PCB. Check the grounding and power supply; if it persists, replace the control board/PCB. |
| A63 | ABM03 control unit anomaly (internal error) | Internal error in the control module on the PCB. Check grounding/electrical noise; if diagnosis recommends, replace the PCB. |
| F64 | ABM03 control unit anomaly (internal error) | Internal fault of the PCB controller (ABM03). Check earth/power connection; if it persists, replace the PCB/controller. |
| A65 | ABM03 control unit anomaly (internal error) | Internal error of ABM03 on the PCB. Confirm correct grounding and absence of spikes; if not recovered, replace the PCB. |
| F66 | Control board anomaly (internal controller error) | Internal fault of the PCB controller (e.g., ABM03/DBM). Check grounding and power supply; if the error persists, replace the PCB/controller. |