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#7040748 - Revision A - September, 2016
MODEL UW-24
MODEL UW-24
Electronic Control System
TROUBLESHOOTING INPUT OPERATIONS
The following pages explain troubleshooting input operations performed at the control panel, namely: Diagnostic
Mode, Manual Valve Activation Mode and Temperature Log Recall Mode.
Diagnostic Mode
Initiating Diagnostic Mode allows the Service Technician to observe real-time temperature readings from all thermis-
tors without temperature averaging. If errors were registered by the thermistors or the defrost system, “Error Codes”
will also be displayed during diagnostic mode.
To initiate Diagnostic Mode, the unit must be ON, then press and hold either COLDER key, and press the POWER
key, then release both keys (See Figure 2-27). If no error codes have been logged, the left display area will show
real-time temperature of the thermistor, the right display area will show the thermistor location code, and all indica-
tors will illuminate. Pressing either COLDER key while in Diagnostic Mode will toggle to the next thermistor location.
(See Figure 2-28, 2-29 and 2-30)
NOTES
:
•
If COLDER and POWER keys are pressed and held for 10 seconds, Manual Valve Activation Mode will be initiat-
ed.
•
Diagnostic Mode will end three seconds after the last key stroke.
Figure 2-27. Initiate Diagnostic Mode - Press and Hold Either COLDER Key, Then the POWER Key
(“UE” = Upper Evaporator)
Figure 2-28. Toggle Through Temperature Readings - Press Either COLDER Key
(“LE” = Lower Evaporator)
Figure 2-29. Toggle Through Temperature Readings - Press Either COLDER Key
(“UP” = Upper Compartment)
Figure 2-30. Toggle Through Temperature Readings - Press Either COLDER Key
(“LO” = Lower Compartment)
