Sub-Zero 700TC-3 Service Manual page 67

Integrated
Integrated
ICEMAKER FAULT TESTING
Bypass 45-minute dwell by pressing ICE ON/OFF key to OFF
then ON. Then depress icemaker switch & manually start ice-
maker by turning driver gear counter-clockwise with screw-
driver.
1 If icemaker starts & finishes cycle:
(NOTE: If >15°F (-9°C), icemaker will only complete 1
revolution.)
a. Visually inspect electrical connections at icemaker &
valve. Repair if necessary.
b. Check valve operation with test cord, if doesn't open,
replace.
c. Check thermostat. Open: 48° (9°C) ± 6°, Close: 15°
(-9°C) ± 3°. Replace icemaker if defective.
d. With icemaker in park position, check solenoid switch
terminals "C" & "NO" for continuity. With ejector
between 8:00 & 10:00 position, check solenoid switch
terminals "C" & "NC" for continuity. If no continuity for
either terminal check, replace icemaker.
2. If icemaker starts but does not finish cycle:
a. With icemaker in park position check holding switch ter-
minals "C" & "NC" for continuity. Then with icemaker
ejector between 10:00 & 12:00, check holding switch
terminals "C" & "NO" for continuity. If no continuity for
either terminal check, replace icemaker. (Refer to
enclosed wiring diagram)
b. With icemaker in park position check shut-off switch
terminals "C" & "NO" for continuity. With ejector
between 12:00 & 2:00 check shut-off switch terminals
"C" & "NC" for continuity. If no continuity for either ter-
minal check, replace icemaker.
c. Check mold heater for 75-85Ω. If outside range,
replace icemaker.
3 If icemaker motor does NOT start:
a. Lower shutoff arm
b. Check motor operation with test cord. If motor doesn't
run, replace icemaker.
c. Check power to & from icemaker switch. Reconnect or
repair connection or replace icemaker as necessary.
d. Check for 115V AC from control board. If power is pres-
ent check & repair connection. If no power, replace
control board.
QUICK REFERENCE
• Water Fill Time - 6.3±.2 seconds
• Fill Tube Heater Ohm - 2850-3890Ω
• Mold Heater Ohm - 75-85Ω
• Water Valve Ohm - 160-165Ω
• Thermostat - Open: 48° (9°C) ± 6°, Close: 15° (-9°C) ± 3°.
• Water Pressure Needed - 20-100 psi constant
3
3 Series
Series
(700- T ALL)
(700- T ALL)
Possible Problems
No / Slow Ice Production
1 Ice maker system switched OFF. Switch ice system ON.
2 Shut off arm in up/OFF position. Move to ON position.
3 Freezer too warm. Check temp's & see troubleshooting
4 Poor airflow over icemaker. Remove obstructions.
5 Ice cube jam. Remove ice & check water fill setting.
6 Water froze in inlet tube. Remove ice from tube. Check
7 Water supply not constant 20-100 psi. Instruct customer.
8 Water line to unit pinched/kinked. Repair water line.
9 Saddle valve not installed correctly to supply line.
10 Saddle valve not fully open. Open valve fully.
11 Icemaker wire/connections loose/broken. Repair wiring.
12 Water valve wire/connections loose/broken. Repair wiring.
13 Defective water valve. Check valve (160-165Ω), Replace
14 Thermostat wire/connections loose/broken. Repair wiring.
15 TCO overheat or short. Replace icemaker.
16 See Icemaker Fault Testing.
No Water Fill
1 Water supply switched OFF. Switch supply water line ON.
2 Water line to unit pinched/kinked. Repair water line.
3 Saddle valve not installed correctly to supply line.
4 Water froze in inlet tube. Remove ice from tube. Check
5 Water valve wire/connections loose/broken. Repair wiring.
6 Defective water valve. Check valve (160-165Ω), Replace
Overflows / Ice Block Forms in Bucket / Oversized Cubes
1 Icemaker not level. Level icemaker.
2 Unit not level. Level unit
3 Water supply not constant 20-100 psi. Instruct customer.
4 Water fill setting too high (> 7 sec's). Adjust setting.
5 Water fill setting too low (< 6.5 sec's). Adjust setting.
6 Defective water valve. Check valve (160-165Ω), Replace
Ice Cubes Hollow or Small
1 Icemaker not level. Level icemaker.
2 Unit not level. Level unit
3 Water supply not constant 20-100 psi. Instruct customer.
4 Water fill setting too low (< 6.5 sec's). Adjust setting.
5 Too little thermalmastic on thermostat. Add thermalmastic.
6 Defective thermostat (Open: 48° (9°C) ± 6°, Close: 15°
Too much Ice
1 Shut off arm/linkage bent/broken. Repair or replace
2 If ejector blades rotate with arm in up/OFF position -
6-13
Icemaker Information
guide in service manual.
a. Water fill setting too low (< 6.5 sec's). Adjust setting.
b. Water fill setting too high (> 7 sec's). Adjust setting.
for 115VAC from control board; Fill tube heater = 2850-
3890Ω.
Reposition.
valve.
Reposition.
for 115VAC from control board; Fill tube heater = 2850-
3890Ω.
valve.
valve.
(-9°C) ± 3°. Replace icemaker if defective.
arm/linkage.
Icemaker faulty. Replace icemaker.
#3758412 - Revision B - December, 2006