Sub-Zero 700TC-3, Service Manual

Page: 35 / 136

Integrated
Integrated
(700-
(700-
3
3
T
T
ALL)
ALL)
Series
Series Electronic Control System
3-21
#3758412 - Revision B - December, 2006
TROUBLESHOOTING INPUT OPERATIONS
The following few pages explain troubleshooting input operations performed at the control panel. The input opera-
tions described are Diagnostic Mode, Manual Component Activation Mode and Temperature Log Recall.
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 detected, “Error Codes” will also display during diagnostic mode.
NOTE: The model 700TF/I-3 has only one compartment thermistor and one evaporator thermistor.
NOTE: Since Diagnostic Mode varies only slightly between the different models, a diagram of the 700TC/I-3 control
panel is used to illustrate Diagnostic Mode key strokes.
To initiate Diagnostic Mode, the unit must be ON, then press and hold either COLDER key, and press the UNIT
ON/OFF key, then release both keys (See Figure 3-48). If no error codes are registered, the left display area will
show real-time temperature of the thermistor, the right display area will show the thermistor location code, and all
LCD indicators will illuminate. Pressing either COLDER key or either WARMER key while in Diagnostic Mode will
toggle to the next or previous thermistor location, respectively. (See Figure 3-49, 3-50 and 3-51 and the Thermistor
Location Code Tables on the next page)
NOTE: If the COLDER and UNIT ON/OFF keys are pressed and held for 10 seconds, Manual Component
Activation Mode will be initiated (this is covered later in the section).
NOTE: Diagnostic Mode will end 20 seconds after the last key stroke.
UNIT ICE
REFRIGERATOR
ON/OFF
ON/OFF
ON/OFF
WARMER COLDER FREEZER WARMER COLDER
ICE
SERVICE
OFF
UNIT ICE
REFRIGERATOR
ON/OFF
ON/OFF
ON/OFF
WARMER COLDER FREEZER WARMER COLDER
ICE
SERVICE
OFF
Figure 3-48. Initiate Diagnostic Mode - Press and Hold Either COLDER Key, Then the UNIT ON/OFF Key
(“F” Indicates Freezer Compartment)
Figure 3-49. Toggle Through Temperature Readings - Press Either COLDER Key
(“r” Indicates Refrigerator Compartment)
UNIT ICE
REFRIGERATOR
ON/OFF
ON/OFF
ON/OFF
WARMER COLDER
FREEZER
WARMER COLDER
ICE
SERVICE
OFF
UNIT ICE
REFRIGERATOR
ON/OFF
ON/OFF
ON/OFF
WARMER COLDER FREEZER WARMER COLDER
ICE
SERVICE
OFF
Figure 3-50. Toggle Through Temperature Readings - Press Either COLDER Key
(“FE” Indicates Freezer Evaporator)
Figure 3-51. Toggle Through Temperature Readings - Press Either COLDER Key
(“rE” Indicates Refrigerator Evaporator)