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Troubleshooting
This Troubleshooting Chart is not prepared to replace the training required for a
professional refrigeration service person, not is it comprehensive
Troubleshooting Chart
Complaint Possible
Causes
Response
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
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
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
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
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
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.
4. Compressor running but fan not running
a. Fan blade bond
b. Incorrect or loose wirings
c. Failed
motors
a. Check for proper clearance
b. Check all wirings
c. Call service for checking open or
shorted windings
5. No cooling but compressor and fan running
a. Evaporator airflow restriction
b. Refrigerant
leakage
c. Refrigeration
system restriction
a. Check for airflow through evaporator
b. Check for loss of refrigerant
c. Call service for checking restrictions
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.
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
