AB Repair PIC fault code list. These only apply to our PICs.
Mk4.0 Round
This is our original code and does not have any extra fault codes added.
Mk4.2 Square v1
| LED Status | Buzzer Status | Fault | Reason for fault code |
| on (no flashing) | Silent | Check IC soldering or R1 or D2 is faulty. | The IC can not detect the line frequency |
| Yellow (no flashing) | Beeping | 240v mode with thermistor disconnected, faulty thermistor or to cold. | This is also for testing the voltage detection is working. |
| Red (no flashing) | Beeping | 110v mode with thermistor disconnected, faulty thermistor or to cold. | This is also for testing the voltage detection is working. |
| Flashing red and yellow | Silent | IC is on the wrong version of PCB (it is for a round buzzer pcb) | |
| LED wrong colour while running |
Some versions of the switch side PCB have the LED fitted in the opposite direction. Switch the 2 LED wires around on the switch side PCB |
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| Too hot or too cold. | Check R3 |
MK5 Round and Square v1
| LED Status | Buzzer Status | Fault |
| on (no flashing) | Silent | Check IC soldering, R1 or D2 is faulty |
| on (no flashing) | Beeping | 240v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| off | Beeping | 110v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| Flashing | Silent | IC on wrong version of PCB |
| Too hot or too cold. Check R3 |
Universal IC V1
| LED Status for mk4.2 square and all mk5 | LED Status for mk 4 round | Buzzer Status | Fault |
| on (no flashing) | same | Silent | Check IC soldering, R1 or D2 is faulty. |
| on (no flashing) | Red (no flashing) | Beeping | 240v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| Off | Yellow (no flashing) | Beeping | 110v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| Slow flash | same | Slow beep | IC has gone to sleep because it has detected a heater fault at startup. |
| on (no flashing) | same | Slow beep | IC has gone to sleep because it has detected a heater fault while running. |