Sub-Zero UC-24 series

Troubleshooting Guides
Under Counter (UC-24) Series
8-3
#7003933 - Revision B - November, 2007
EC TEST / ACTION
05
06
07
08
A. If “EE” for refrigerator compartment was displayed and “SERVICE” flashing, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. If “EE” for refrigerator compartment was NOT
displayed, problem is intermittent thermistor error:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
4. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 05” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “05” Error Code. See Error Code 50 Test/Actions.
A. Initiate Diagnostic Mode. If “EE” is displayed for refrigerator evaporator thermistor, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. Initiate Diagnostic Mode. If “EE” is NOT
displayed for refrigerator evaporator thermistor, problem is intermittent:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
4. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 06” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “06” Error Code. See Error Code 50 Test/Actions.
A. If “EE” for freezer compartment was displayed and “SERVICE” flashing, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. If “EE” for freezer compartment was NOT
displayed, problem is intermittent thermistor error or caused by over-heat-
ing (above 116°F), check the following:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check for proper mounting and location of freezer compartment thermistor. Remount correctly.
4. Check electrical connections and operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C).
Reconnect / repair or replace terminator.
5. Check thermistor electrical connections and continuity at J5 on control board. Reconnect / repair.
6. Check resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 07” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “07” Error Code. See Error Code 40 Test/Actions.
A. Initiate Diagnostic Mode. If “EE” is displayed for freezer evaporator thermistor, check the following:
1. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
B. Initiate Diagnostic Mode. If “EE” is NOT
displayed for freezer evaporator thermistor, problem is intermittent thermis-
tor error or caused by over-heating (above 116°F), check the following:
1. Door not closing properly. Correct door closing problem.
2. Check light switch, wiring & electrical connections. Repair wiring / connections or replace switch.
3. Check for proper mounting and location of freezer evaporator thermistor. Remount correctly.
4. Check electrical connections and operation of defrost terminator - Cut-in 30°F (-1°C) /Cut-out 55°F (13°C).
Reconnect / repair or replace terminator.
5. Thermistor electrical connections and continuity from thermistor to J5 on control board. Reconnect / repair.
6. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
C. If “EC 08” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-
pressor run condition that may or may not be associated with the “08” Error Code. See Error Code 40 Test/Actions.
ERROR CODE TROUBLESHOOTING GUIDE
NOTE: Always clear Error Codes after repairs are complete.