No Ice - Sub-Zero UC-24 series Service Manual

Troubleshooting Guides
PROBLEM
K. No Ice
#7003933 - Revision B - November, 2007
Under Counter (UC-24) Series
POSSIBLE CAUSE
No Water Supply to Unit
Unit Has Not Run Long Enough
Warm Freezer Temperatures
(NOTE: Freezer must be 17°F (-8°C) or
colder for icemaker to function)
Shut-off Arm Stuck in Up/Off Position
Disconnected or Defective Water Valve
No Power to Icemaker
Frozen Fill Tube - Water Supply Problem
Icemaker System Fault
a. Disconnected or damaged electrical
connections at icemaker or water valve.
b. Defective icemaker
c. Defective icemaker
d. Disconnected or damaged electrical
connections at icemaker
8-12
TEST / ACTION
Connect/turn on water supply.
Freezer must be 17°F (-8°C) for icemaker to
operate, approximately 24 hours after unit
installation. Instruct customer.
See PROBLEM A, C, D, E, & G earlier in
Troubleshooting Guide.
Check shut-off arm, if stuck in up/OFF posi-
tion, correct problem.
Check electrical connections and water con-
nections at water valve, Reconnect / repair
connections.
Check resistance of water valve, 160 ohms.
Replace if defective.
Check for power to icemaker. If no power
repair / reconnect wiring.
Check water supply pressure for "constant"
20-100 PSI. If not, instruct customer.
Manually start icemaker with jumper between
ports "T" & "H". Watch cycle of icemaker and
see #1, #2 & #3 below.
1. If icemaker motor starts and finishes cycle:
a. Check for 115V at valve during fill mode. If
no 115V, inspect connections at icemaker
and valve. Repair or replace connection.
b. Check for 115V from icemaker during fill
mode. If no power, replace icemaker.
2. If icemaker motor starts but does not finish
cycle:
c. Replace icemaker.
3. If icemaker motor does NOT start:
d. Check for 115V to icemaker. If no power,
repair electrical connection.