Service Diagnostic Tips - Electrolux 5995502399 Service Manual

Service Diagnostic Tips

A prime requisite on the initial contact is: Always allow
the customer to explain the problem. Many times the
trouble can be diagnosed more quickly, based on the
customer's explanation. Most of all, do not jump to
conclusions until you have heard the full story and have
evaluated the information obtained from the customer.
Then proceed with your diagnosis.
Before starting a test procedure, connect the product
service cord to the power source, through a wattmeter,
combined with a voltmeter. Then make a visual
inspection and operational check of the refrigerator to
determine the following:
1. Is the product properly leveled?
2. Is the product located for proper dissipation of heat
from the condenser? Check recommended spacing
from walls.
3. Feel condenser. With compressor in operation,
condenser should be hot, with gradual reduction in
temperature from entry to exit of condenser.
4. Are door gaskets sealing properly?
(Refrigerators and freezers)
5. Does the door actuate the light switch?
(Refrigerators and freezers)
6. Is evaporator fan properly located on motor shaft?
7. Is the thermostat sensing element properly
positioned?
8. Observe frost pattern on evaporator.
9. Check thermostat knob setting.
10. Inscribe bracket opposite slotted shaft of defrost
timer to determine if timer advances (Refrigerators
and freezers - auto defrost models only).
The service technician should inquire as to the number
of people in the family to determine the service load and
daily door openings. In addition, he should know the
room temperature for refrigerator and freezers. For
air-conditioners, check room size, temperature, amount
of people, windows, and other factors that increase the
load on the product.
After this phase of diagnosis is completed, a thorough
operational check should be made of the refrigeration
system.
Refrigerator and Freezer Air Temperatures
Temperatures are affected by improper door seal, frost
accumulation on the evaporator, service load, ambient
temperature, percent of relative humidity, thermostat
calibration (cut-in and cut-out), location of evaporator fan
blade on motor shaft, and by compressor efficiency.
Line Voltage
It is essential to know the line voltage at the product.
A voltage reading should be taken at the instant the
compressor starts, and also while the compressor is
running. Line voltage fluctuation should not exceed 10%
plus or minus, from nominal rating. Low voltage will
cause overheating of the compressor motor windings,
resulting in compressor cycling on thermal overload, or
the compressor may fail to start. Inadequate line wire
size, and overloaded lines, are common reasons for low
voltage at the product.
Your Country may have regulations or restrictions
governing the discharging of chlorofluorocarbons
(CFC's) such as R-12 and R-22 to the atmosphere.
Therefore, when discharging or purging the
sealed system, use an approved refrigerant
recovery system.
7-23
Sealed System