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 |
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 |
New MK4 and MK5 V2 ICs
| LED Status | Buzzer Status | Fault |
| on (no flashing) | Silent | Check IC soldering, R1 or D2 is faulty. |
| MK5 LED on/ MK4 yellow (no flashing) | Beeping | 240v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| MK5 LED off/ Km4 red (no flashing) | Beeping | 110v mode with thermistor disconnected, faulty thermistor or to cold. This is for testing the voltage detection is working. |
| Slow flash | Slow beep | IC has gone to sleep because it has eather detected a heater fault at startup, thermistor has came disconnected or 20 min timer has ranout. |