• Code: 13,037.61
• Display: 13,037.61 TCH_RESERVOIR_ADC_ IS_BAD
• Description: The analog to digital converter appears to be bad. Try reseating the printhead data cable. Then reseat the main board. If the problem continues try replacing the main board and then the printhead.

• Code: 15,000.40
• Display: 15,000.40: TCD_THERMISTOR_ FAULT
• Description: The drum temperature is incorrect as sensed by the drum thermistor. Ensure that there is adequate clearance for airflow (at least 4 inches (10 cms.) on all sides) and that the room temperature is within specification.

• Code: 15,001.42
• Display: 15,001.42: TCD_THERMISTOR_ OPEN
• Description: The drum thermistor appears to be open. Replace the drum-temperature sensor. 15,002.43: TCD_THERMISTOR_ SHORT The drum thermistor appears

• Code: 15,003.44
• Display: 15,003.44: TCD_THERMISTOR_ HOT
• Description: The drum heater is running away. Unplug the printer NOW! Verify that the vent on the right side of the printer is not blocked. Ensure that the drum fan rotates and is installed correctly.

• Code: 15,004.45
• Display: 15,004.45: TCD_THERMISTOR_ SLOW
• Description: Most likely cause is a failed drum heater. The head to drum gap should only be checked or adjusted on the Phaser 840. The Phaser 850 and 860 have a pre-adjusted head.

• Code: 16,000.40
• Display: 16,000.40: TCD_THERMISTOR_ FAULT
• Description: The preheater temperature is incorrect as sensed by the a thermistor in the preheater. Ensure that there is adequate clearance for airflow (at least 4 inches (10 cms.) on all sides) and that the room temperature is correct.

• Code: 16,001.43
• Display: 16,001.43: TCP_THERMISTOR_ OPEN
• Description: The preheater thermistor appears to be open. Check the preheater cables on the right side of the printer. Replace the paper preheater. Replace the power supply.

• Code: 16,002.44
• Display: 16,002.44: TCP_THERMISTOR_ SHORT
• Description: The preheater thermistor appears to be shorted. Replace the paper preheater.