System Diagnostics - Electrolux Side by Side Refrigerators Service Manual

System Diagnostics

An electrical connection between the light switch and
refrigerator light bulb is coupled to the ADC system board,
providing a manual method of initiating and terminating
a defrost cycle. The refrigerator cold control MUST BE IN
THE CLOSED POSITION, calling for refrigeration, in or-
der to initiate a defrost cycle. The procedure to manually
initiate or terminate a defrost cycle is a minimum of five
depressions of the light switch within a six second time
period. When this is done, the following will apply:
• If a defrost is initiated manually and the termination
thermostat is closed, the heater will be actuated until
the termination thermostat opens. A 6 minute drip
time follows before actuating the compressor and
setting the next defrost time.
• When terminating the defrost manually and the
termination thermostat is closed or open, the
compressor is activated and sets the next defrost
time.
An electrical connection between the defrost heater and
the defrost termination thermostat is coupled to the ADC
for system data, but also gives the technician the ability
to check electrical continuity individually of either the
defrost heater or termination thermostat from the ADC
mounting area.
The ADC printed circuit board has component identification
and lead wire color (name) adjacent to each electrical
tab. Four of the tab terminals mate with the present
defrost timer connection and the remaining 6 individual
leads will have the color name printed on the board next
to the tab matching the wire color. See Figure 24.
NOTE: Because the evaporator fan motor operates
through the ADC control, you cannot replace the
ADC with a defrost timer. (Refer to Figures 14 to 17
when doing voltage checks.
To check input power to the board (See Figure 24.):
1. Check voltage between E4 and E8. You should have
LINE VOLTAGE ± 10%.
2. If freezer control contacts are closed, there should
be LINE VOLTAGE ± 10% between E4 and E2. If no
voltage is present, check control.
3. If food compartment contacts are closed, there
should be LINE VOLTAGE ± 10% between E4 and E6.
If no voltage is present, check control.
4. With door open and refrigerator light switch contacts
closed, there should be LINE VOLTAGE ± 10% between
E4 and E7. If no voltage is present, check light switch.
IMPORTANT NOTE: The light bulb and door switch
must be operational in order to manually initiate a
defrost cycle, or for the unit to enter vacation mode.
Manual initiation of defrost can only be done by using
the light switch in the refrigerator compartment.
To check output power from board (See Figure 24.):
1. If voltage is coming from freezer or food
compartment control, there should be LINE VOLTAGE
± 10% between E4 and E9 to operate evaporator fan
motor, unless it is in defrost or within 7 minute delay
after defrost. (See NOTE A.)If no voltage is present,
replace board.
2. If voltage is coming from freezer control, there should
be LINE VOLTAGE ± 10% at either E4 or E1, if relay is
set in defrost, or E4 to E3, if relay is set for compressor
to run.
3. If there is voltage between E4 and E3, compressor
and condenser fans should be running. If they are
not, check voltage at compressor. If voltage is
present, follow procedure to check compressor. If
voltage is not present, check wiring between ADC
and compressor.
NOTE: To change relay from compressor run to
defrost, open door and push light switch in and out 5
times within 6 seconds. The relay power should
change from E4-to-E3 to E4-to-E1. The compressor
should shut off and the defrost heater should come on.
4. If there is LINE VOLTAGE ± 10% between E4 and E1,
there should be power to defrost heater. If limit
switch is closed, heater should be on. If heater is not
operating, check voltage between E5 and E6. If heater
is not working but line voltage is present, heater is
open. If heater is not operating, and there is no voltage
between E5 and E6, limit switch is open.
NOTE A: To change relay from defrost to compressor
run, open refrigerator door and push light switch in
and out 5 times within 6 seconds. The relay power
should change from E4-to-E1 to E4-to-E3. This will
terminate the defrost cycle and start the compressor
and condenser fan running. There will be a one minute
delay in the evaporator fan starting.
Name of component connecting to
terminal is at top of terminal.
Wire color is written
at side of terminal
2 4
Terminal number is at
bottom of terminal
Figure 24