Frigidaire LGUB2642LF2 Service Manual page 30

Electronic Control
Test 23: Fresh food door
Freezer Display will show "OP" open when doors are
open and "CL" when door is closed.
Test 24: Freezer door (See Flow Chart 5)
Freezer Display will show "OP" open when door is open
and "CL" when door is closed.
Test 26: DTT (Defrost Limit Switch)
Display will show "OP" open when switch is open and
"CL" when door is closed.
Test 29: Fresh food thermistor
Push 'power on-off' to change between F and C.
The display will show the actual temp if the thermistor
is good and "OP" or "SH" if the thermistor is open or
shorted, respectively.
Test 30: Freezer thermistor
Push 'power on-off' to change between F and C.
The display will show the actual temperature if the
thermistor is good and "OP" or "SH" if the thermistor is
open or shorted, respectively.
Test 33: Ambient thermistor at main control
board.
Push 'power on-off' to change between F and C.
The display will show the actual temp if the thermistor
is good and "OP" or "SH" if the thermistor is open or
shorted.
NOTE: If "Er" is shown in the display, replace the main
control board.
Test 34: Ambient thermistor at user interface.
* on some models
Push 'power on-off' to change between F and C.
The display will show the actual temp if the thermistor
is good and "OP" or "SH" if the thermistor is open or
shorted.
NOTE: If "Er" is shown in the display, replace the main
control board.
Firmware Versions
(or 34 if available),
After Test 33
versions are displayed. There are 5 different software
versions numbered 0 to 4. Press fresh food up (∧) or
'+' to select the different versions and 'power on-off' to
display the selected version.
0 - Main board parameter version to distinguish model
1 - Used by board manufacturer only
2 - Main board software version
3 - Used by board manufacturer only
4 - UI software version
the system software
3-8
Temperature Resistance Chart
For Negative Temperature
Coefficient Thermistors