– 85 –
Display Mode Comments
t1 Demo Mode Enters demo mode. All temperature control board functions
will operate normally but the unit will not cool. Cycle power to
refrigerator to exit Demo Mode.
t2 Communication Test Dispenser to Main communications test. Test will query main
board its version, “P”/”F” on most right display if Pass/Fail.
t3 Display Self-Test All of the LEDs and numerical segments will illuminate. All
displays will initially show “888”. The slew keys FF and FZ will
be used to increment and decrement the displays. The buttons
will be used to toggle the status of the LED it is associated with.
To exit this test, enter the Service Mode code.
t4 Sensor Self-Test This test does a check on all thermistors located throughout
the unit. The test mode will stop ashing and the thermistor
numbers from 1 to x (x is the number of thermistors) will appear
on the most left display. For each thermistor, the dispenser will
respond by displaying the following on the most right display:
P: Pass O: Open thermistor circuit
F: Fail S: Short thermistor circuit
1: FF Thermistor 2: Ambient Thermistor
3: FZ Thermistor 4: Evap Thermistor
5: IB Thermistor
t5 Duct Door Test Duct Door will open for 10 seconds and then close.
t6 Recess Heater Test Turns on the dispenser recess heater for 60 seconds.
t7 Damper Test FF Damper will open, pause briey, and then close.
t8 Fan Speed Test Cycles each of the system fans on for 5 seconds in the following
order: (Evaporator, Ice Box and Condenser).
t9 Cooling System Test This mode runs the sealed system 100% of the time. This test
will automatically time out after 1 hour of run time. A refrigerator
reset may exit this mode.
t10 Enter Pre-Chill This places the freezer in pre-chill mode, essentially issuing a
“Force Pre-chill” command to the main control. It will return to
normal operation on its own. This command will be ignored if
the refrigerator is set to OFF/Standby mode.
t11 Toggle Defrost Each time any button on the temperature board other than
four temperature adjust buttons is pressed the status of the
defrost heater will toggle. There will be a 20 second delay
before defrost heater will turn on. If the evaporator thermistor
temperature is above defrost termination temperature the heater
will not turn on.
t12 Refrigerator Reset Resets both Dispenser Board and Main Board. Also exits any
tests initiated in Service Mode.
t13 Service Mode Exit Causes a soft reset to occur at the dispenser board. Note this
will not terminate test modes that the main board is maintaining
as a result of the service diagnostics mode. To do that, a
Refrigerator Reset should be performed.
t14 Celsius / Fahrenheit
Selector
Change Temperature display units from Celsius to Fahrenheit or
Fahrenheit to Celsius.
Service Mode Tests
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