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This Troubleshooting Chart is not prepared to replace the training required for a
professional refrigeration service person, not is it comprehensive
Complaint
1. Unit not running
a. Power cord unplugged
b. No power to unit
c. Temperature setting high
d. Low voltage.
e. Incorrect or loose wirings.
f.
Defrost light blinking
g. Running light blinking
2. Compressor stopping and starting but short running time
a. Incorrect temperature setting
b. Incorrect voltage
c. Failed thermistor
d. Failed components
e. Improper condenser airflow
f.
Dirty condenser
g. Overcharge of refrigerant
h. Discharge or suction pressure too
high
3. Fan motor running but compressor not running
a. Incorrect power supply
b. Incorrect or loose wirings
c. Failed components
d. Liquid refrigerant in the compressor
4. Compressor running but fan not running
a. Fan blade bond
b. Incorrect or loose wirings
c. Failed motors
5. No cooling but compressor and fan running
a. Evaporator airflow restriction
b. Refrigerant leakage
c. Refrigeration system restriction
6. Temperature too high or unit running too long
a. Improper evaporator or condenser
airflow
b. Dirty Condenser
c. Iced evaporator
d. Malfunctioning fans
e. Improper seals
f.
Improper area to be cooled.
Troubleshooting
Troubleshooting Chart
Possible Causes
- 12 -
Response
a. Check for power cord plug
b. Check power at receptacle & fuses
c. Lower temperature setting
d. Contact an authorized electrician
e. Check all wirings and connections
f.
Under defrost
g. Call service for failed components
°
a. Set 55 to 60
F
b. Check for voltage
c. Check thermistor by placing it in ice
water and measuring resistance
d. Check compressor windings, start
relay and overload protector.
e. Check for condenser fan
f.
Clean condenser
g. Call service for removing refrigerant
h. Call service for OEM information
a. Check for proper voltage
b. Check all wirings and connections
c. Check start relay, start capacitor,
overload protector, compressor.
d. Call service for OEM information.
a. Check for proper clearance
b. Check all wirings
c. Call service for checking open or
shorted windings
a. Check for airflow through evaporator
b. Check for loss of refrigerant
c. Call service for checking restrictions
a. Check for air restrictions
b. Clean condenser
c. Defrost and reset temperature
d. Check for both fans
e. Check for gasket and door opening
f.
Check for excessive load incorrect
installation
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