Sub-Zero UC-15I Service Manual page 63

Model UC-15I (Undercounter Ice Machine)
PROBLEM
A. Ice Machine Does Not
Operate
B. Ice Machine Operates, but
Will Not Make Ice
(Continued on next page)
POSSIBLE CAUSE
Improper Ambient Temperatures
No Electrical Power to Appliance
Control Board Fuse Open
Transformer Fault
Control Board Fault
Control Panel (User Interface) Board
Fault
Bin Thermostat Fault
Drain Pump Safety Switch is Open.
(UC-15IP, UC-15IPO Only)
Improper Ambient Temperatures
Improper Water Pressure
6-3
TEST / ACTION
Ambient air temperature minimum = 50°F
(10°C), maximum = 100°F (38°C) for models
UC-15I and UC-15IP; 110°F (43°C) for models
UC-15IO and UC-15IPO. Advise customer.
NOTE: Check control board light to see if ice
machine shutdown on over temperature limit
(control board light will flash rapidly).
a. Verify fuse or circuit breaker is closed.
Replace fuse; switch circuit breaker on. If
circuit breaker trips or fuse blows again,
check for electrical short at outlet or appli-
ance.
b. Verify ice machine is plugged into function-
ing, properly polarized and grounded 3-
prong receptacle. Plug unit in; repair elec-
trical outlet or power cord.
c. See Wiring Diagrams and check for voltage
at appropriate points from outlet to control
board in control box. Reconnect, repair,
replace wiring or connectors.
Visually inspect fuse, replace if open.
If interior light functions or red control board
light is energized, transformer is OK. If trans-
former is receiving power but no output,
replace transformer.
If transformer is supplying power to control
board and red control board light will not ener-
gize, replace control board.
If red control board light is energized, but
pressing "POWER" does not energize green
"POWER" light, then check wiring between
main control board and control panel board. If
wiring is defective, replace wire harness; if
wiring is good, replace control panel board.
With no ice on bin level sensing tube, thermo-
stat should be closed; open with ice on tube
after ~ 3 minutes. Replace if defective.
Check drain hose for kinks or restrictions.
Repair or replace bad hose.
Ambient air temperature minimum = 50°F
(10°C), maximum = 100°F (38°C) for models
UC-15I and UC-15IP; 110°F (43°C) for models
UC-15IO and UC-15IPO. Advise customer.
NOTE: Check control board light to see if ice
machine shutdown on over temperature limit
(control board light will flash rapidly).
Water pressure must be 20 - 80 psi (1.4 - 5.5
bar). Advise customer.
#7012423 - Revision A - August, 2009
Troubleshooting