Unrecoverable Errors Printing is no longer possible when an unrecoverable error occurs. The printer must be repaired. Turn off the power immediately when an unrecoverable error occurs. CAUTION 16 Error Error description Error LED flash code Approx. 160 ms R/W error in memory or gate array After R/W checking, the printer does not work correctly. High voltage error The power supply voltage is extremely high. Low voltage error The power supply voltage is extremely low. CPU execution error The CPU is executing an incorrect address. I/F board is not connected. Thermistor error The print head temperature is abnormal. The thermistor is not detected. Thermistor wiring is not connected.