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IV. Service Diagnosis
1. This unit should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
2. Risk of electric shock. Use extreme caution and exercise safe electrical
practices.
3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
4. Make sure all food zones are clean after the unit is serviced. For cleaning
procedures, see "VI. Cleaning Instructions."
A. Diagnostic Procedure
The evaporator fan motor and cabinet light have a constant 115VAC supplied to
them. These 2 components switch on and off through the operation of the door
switch relay. When the door switch relay de-energizes (door open), relay contact
terminals 6 (white (W)) and 2 (violet (V)) close to complete the neutral wire
(white (W)) circuit to the cabinet light. When the door switch relay energizes
(door closed), relay contact terminals 6 (white (W)) and 3 (dark blue (DBU))
close to complete the neutral wire (white (W)) circuit to the evaporator fan
motor. This switching of the neutral wire differs from conventional switching of
the power wire.
The diagnostic procedure is basically a sequence check that allows you to diagnose the
electrical system and components. Before proceeding, check for correct installation and
proper voltage per unit nameplate. As you go through the diagnostic procedure, check
to assure the components energize and de-energize correctly. If not, those components
or controls are suspect. Always choose a white (W) neutral wire to establish a good
neutral connection when checking high voltages. If the display module is in alarm, see
"II.D.2. Alarm Safeties." For further details, see "IV.B. Control Module Check." For factory
default settings, see "II.C.2.a) Default Settings."
The maximum allowable voltage variation is 10 percent of the nameplate rating.
115VAC is used as a reference voltage when checking voltage to components.
Voltage may vary depending on power supply.
1) Move the power switch to the "OFF" position.
2) Unplug the unit from the electrical outlet.
3) Remove the control box cover.
4) Plug the unit back into the electrical outlet.
5) Move the power switch to the "ON" position.
6) Confirm proper supply voltage (115VAC) to the power switch.
Continue to "IV.A.1. Refrigerator" or "IV.A.2. Freezer."
WARNING
WARNING
IMPORTANT
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