Sub-Zero UC-24 series Service Manual page 39

Under Counter (UC-24) Series
ERROR CODE TROUBLESHOOTING GUIDE
EC
40 A. If Error Code 07, 20, 21, 22, 23, or 24 is also displayed during Diagnostic Mode, see Test/Actions under that code.
B. Check for obstructions to freezer door closing. Remove obstruction.
C. Check cleanliness of condenser. Clean if needed.
D. Check for obstruction to condenser fan blade or loose fan blade. Remove obstruction/Tighten Blade.
E. With unit running, check for AC Power from compressor to condenser fan. Repair defective wiring or replace defec-
tive motor.
F. Check resistance of freezer compartment thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defective.
G. Check evaporator fan blade position and for obstructions. Reposition if incorrect/Remove obstruction.
H. With unit running and light switch depressed:
1. Check for AC Power form J3-7 to light switch. Repair wiring/Replace defective switch.
2. Check for AC Power form J3-1 to evaporator fan motor. Repair wiring/Replace defective motor.
3. Check for AC Power form P1 to compressor. Repair wiring if defective.
I. Check sealed system for leaks, restrictions or inefficient compressor.
50 A. If Error Code 05 is also displayed during Diagnostic Mode, see Test/Actions under that code.
B. Check for obstructions to refrigerator door closing. Remove obstruction.
C. Check resistance of refrigerator compartment thermistor - 30,000 to 33,000 ohms at 32°F (0°C). Replace if defec-
tive.
D. Check refrigerator compartment fan blade position and for obstructions. Reposition if incorrect/Remove obstruction.
E. With unit running and light switch depressed:
1. Check for AC Power form J3-5 to evaporator fan motor. Repair wiring/Replace defective motor.
F. Check air baffle control operation. Repair wiring/Replace if defective.
G. Check sealed system for leaks, restrictions or inefficient compressor.
NOTE: Always clear Error Codes after repairs are complete.
TEST / ACTION
8-5
Troubleshooting Guides
#7003933 - Revision B - November, 2007