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III. Troubleshooting Chart
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. Incorrect Temperature setting
d. Low voltage
e. Incorrect or loose wirings
f.
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
3. Fan motor running but compressor not running
a. Incorrect power supply
b. Incorrect or loose wirings
c. Failed components
d. Liquid
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. Insufficient cooling 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
Table 3-1 Troubleshooting Chart
Possible Causes
refrigerant
in
a. Check for power cord plug
b. Check power at receptacle& fuses
c. Check for temperature setting
d. Contact an authorized electrician
e. Check all wirings and connections
f.
Check
start
overload protector, compressor. Fans.
a. Set 55 to 60
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. Remove refrigerant
h. Refer to OEM service information
a. Check for proper voltage
b. Check all wirings and connections
c. Check
start
overload protector, compressor.
the
d. Refer to OEM service information.
a. Check for proper clearance
b. Check all wirings
c. Check for open or shorted windings
a. Check for airflow through evaporator
b. Check for loss of refrigerant
c. Check for 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
- 19 -
Response
relay,
start
capacitor,
°
F
relay,
start
capacitor,
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