700-2 BASE UNIT ELECTRONIC CONTROL TROUBLESHOOTING INPUT OPERATIONS
This page illustrates 700-2 base unit troubleshooting input operations performed at the control panel, which at this
writing is only Diagnostic Mode.
Diagnostic Mode
Diagnostic Mode allows the service technician to observe real-time temperature readings from the thermistors in
both compartments and at both evaporators without off-set adjustments or temperature averaging.
NOTE: There is only one compartment thermistor and one evaporator thermistor in the model 700BF/I-2.
NOTE: Since the Diagnostic Mode varies only slightly between the 700BR-2 and 700BF/I-2, a diagram of the
700BR-2 control panel is used to illustrate Diagnostic Mode key strokes.
To initiate Diagnostic Mode, the unit must be ON. With the unit ON, press and hold either
COLDER key, then press
the UNIT ON/OFF key, then release both keys. The left temperature display area indicates the real-time tempera-
ture of the first thermistor being read. The left temperature display area shows a code which indicates the location
of the thermistor, and all annunciators illuminate on the LCD indicating the unit is in Diagnostic Mode (See Figure 3-
95 and Thermistor Location Code Tables at bottom of page). Pressing either COLDER key while in Diagnostic Mode
will toggle to the next thermistor location (See Figure 3-96 and Thermistor Location Code Tables at bottom of page).
NOTE: If “EE” is observed in the left temperature display area during Diagnostic Mode, the thermistor in that loca-
tion is defective or there is a break in that thermistor’s wiring.
NOTE: Diagnostic Mode will end twenty seconds after the last key stroke.
Figure 3-95. Initiating Diagnostic Mode
Press and Hold Either COLDER Key, Then Press the UNIT ON/OFF Key
Figure 3-96. Toggling Through Temperature Readings in Diagnostic Mode
Press Either COLDER Key
Base Unit Thermistor Location Code Tables
700BR-2
THERMISTOR LOCATION CODE
Lower Compartment L
Upper Compartment U
Evaporator E
700BF/I-2
THERMISTOR LOCATION CODE
Freezer Compartment F
Evaporator E
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