40 Section C - Service Diagnostics
Test 6 - Defrost
Variable 1. Number of defrosts, last 72 hours
Variable 2. Duration of last defrost heater on time in minutes.
Variable 3. Will turn on defrost heater.
If current flow to heater is sensed, the letter ‘D’ will be displayed. If no current flow
is sensed, the letter ‘D’ will flash. This will continue until servicer advances to
another test or 5 minutes have passed without a key entry.
Test 7 - Compressor and condenser fan on
Variable 1. Compressor run time percentage in last 72 hours
Variable 2. Number of compressor cycles last 24 hours
Variable 3. Average compressor speed (Variable speed compressor only) Speed
displayed as a number between 16 and 45. Actual speed is times 100.
Variable 4. Run compressor and condenser fan motor. The display will flash the
letter “C” when the compressor and condenser fan are running.
Test 8 Default Settings / Clear Service Data
Variable 1. Display “1” Indicates default settings have been changed and/or there is
service data in memory.
Variable 2. Display “0” Indicates Factory Defaults (resets temperature settings to 0
and 37° F) and service data memory cleared.
To reset temperatures to factory default, clear the service memory, and enable
NOTE
Stepper motors require alternating polarities of DC current to operate. This is
accomplished with a circuit on the main board. Applying straight 12 V DC to the damper
motor will not make the motor run and it could damage the motor windings. Only test
the damper motor through the refrigerator control system.
NOTE
This test will display a “0” on models with standard speed compressors.
NOTE
If the defrost limit switch opens during the time the heater is on the D will change to a
flashing D, indicating there is no current flow.
NOTE
Diagram C on Page 41 will show key commands for service.
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