Description: The main thermistor (TH1) has poor contact or an open circuit. The thermal switch (TP1) has an open circuit. The fixing heater has an open circuit. The AC driver is faulty. The DC controller PCB is faulty.
The temperature detected by the main thermistor is 70°C for 2 sec or more after it has reached 100°C.
The error must be reset in service mode (COPIER>FUNCTION> CLEAR>ERR).