U-Line Understanding Ice Maker Error Codes and Thermistor Outages

Section 3 - Service and Repair

THERMISTOR OUTAGE

If the refrigerator thermistor (T1) fails, the unit will continue to operate based on the freezer temperature. Cycle lengths and temperatures may not be exact; however, this will prevent the loss of perishables. The display will show “ER.” The exact error can be accessed via the service mode.

If the ice maker thermistor (T2) fails, the unit will operate except it will not produce ice. The display will show “ER.” The exact error can be accessed via the service mode.

If the freezer thermistor (T3) fails, the unit will continue to operate based on the refrigerator (T1) temperature. Cycle lengths and temperatures may not be exact; however, this will prevent the loss of perishables. The display will show “ER.” The exact error can be accessed via the service mode.

If the pan thermistor (T4) fails, the unit will operate normally; however, the defrost will take place on time only rather than time/ temperature. The display will show “ER.” The exact error can be accessed via the service mode.

SERVICE

To check to see which relays are currently operating, hold the COLDER key and press the ON/OFF key three times. When entering the sequence, keep the COLDER key pressed until you completely release the ON/OFF key for the third time. The display will cycle through a series of numbers to tell which relays are energized. For example, if the unit was in ice-making mode the display would show 11 20 31 40 51 60 70. The first number is the relay number. In the second number, 1 means ON and 2 means OFF. The relay information can be found in the Control Section.

Each relay can also be turned on and off individually to determine whether or not the board and component are operating. If a board is suspected of not operating correctly, you can run through this sequence to ensure each component is turning on and off through the board correctly. Go into service mode and choose option #22. This will cycle every relay on and off showing 10 11 20 21 …. If a

component fails to turn on when the relay does, you can verify if there is voltage present by using a voltmeter to check the board output.

To view the actual refrigerator (T1) temperature, hold the WARMER key until the actual temperature is displayed. To view the actual thermistor readings for 2-4, hold the WARMER and COLDER keys for about five seconds. The display will cycle through the three thermistors and their temperatures. If a thermistor is unused in a unit it will show a “0” reading.

In the general section the methods to enter some other service modes are available. For these models some useful modes are the ICE MAKER OFF MODE, FORCED ICE MAKER HARVEST, and FORCED REFRIGERATOR DEFROST. These can be useful in servicing the unit.

TROUBLESHOOTING:

Error Codes

E1, E2, E7, E8, E9	Bad thermistor errors. Replace thermistor.
	Check for thermistor errors by accessing
	“View thermistor # status (2, 19, 20, or 21).” If
	the error code is repeated, the thermistor is
	open or shorted. If a temperature is displayed,
	the thermistor is not defective.
E3	This will be accompanied by a beep every
	minute. This signals that the door (or bottom
	drawer) has been left open for longer than 20
	minutes. Close the door to reset. If the light
	and display do not go off when the door is
	closed check to make sure the magnet is
	positioned properly.
E5	This signals that the unit has been above set-
	point for more than twelve hours by at least 10
	degrees. After repair is completed, leave for 24
	hours to see if the problem is corrected. If it is
	not corrected, it is most likely a refrigeration
	system issue.
E6	This signals that the refrigerator section has
	been at least 10 degrees below set-point for at
	least twelve hours. This would most likely be
	caused by a bad relay and the circuit board.
E10	This will be accompanied by a beep every
	minute. This signals that the top drawer has
	been left open for longer than 20 minutes.

Close the door to reset. If the light and display do not go off when the door is closed check to make sure the magnet is positioned properly.

After checking the errors be sure to clear the error log by performing service option 12.

Not making ice

The ice maker needs to be down to 15°F before initiating a harvest. If above 15°F, the unit is not cooling properly or has not been plugged in for a sufficient period of time.

The CO2175DWR model will only harvest ice with the lower drawer closed.

To check the operation of the circuit board and the ice maker, force an ice harvest through the keypad input. During this time you can check to see if the blades rotate, if they stop anywhere, if the water valve opens, etc.

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