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Troubleshooting

Troubleshooting

Note: 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
  2. Compressor stopping and starting with short running time
  3. Fan motor running but compressor is not
  4. Compressor running but fan is off
  5. No cooling but compressor and fan are running
  6. Temperature too high or unit running too long
  7. House circuit tripping
  8. Noisy operation
 1. Unit not running

Possible Causes Response
A. Power cord unplugged A. Check for power cord plug
B. No power to unit B. Check power at receptacle and fuses
C. Temperature setting high C. Lower temperature setting
D. Low voltage D. Contact an authorized electrician
E. Incorrect or loose wiring E. Check all wiring and connections
F. Defrost light blinking F. Unit in defrost mode
G. Running light blinking G. Call service for failed components

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2. Compressor stopping and starting with short running time

Possible Causes Response
A. Incorrect temperature setting A. Set 55°F to 60°F
B. Incorrect voltage B. Check for voltage
C. Failed thermistor C. Check thermistor by placing it in ice water and measuring resistance.
D. Failed components D. Check compressor windings, start relay and overload protector.
E. Improper condenser airflow E. Check for condenser fan
F. Dirty condenser F. Clean condenser
G. Overcharge of refrigerant G. Call service for removing refrigerant
H. Discharge or suction pressure too high H. Call service for OEM information

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3. Compressor stopping and starting with short running time

Possible Causes Response
A. Incorrect power supply A. Check for proper voltage
B. Incorrect or loose wiring B. Check all wiring and connections
C. Failed components C. Check start relay, start capacitor, overload protector and compressor.
D. Liquid refrigerant in the compressor D. Call service for OEM information

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4. Compressor running but fan is off

Possible Causes Response
A. Fan blade bond A. Check for proper clearance
B. Incorrect or loose wiring B. Check all wiring and connections
C. Failed motors C. Call service to check for open or shorted windings

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5. No cooling but compressor and fan are running

Possible Causes Response
A. Evaporator airflow restriction A. Check for airflow through evaporator
B. Refrigerant leakage B. Check for loss of refrigerant
C. Refrigeration system restriction C. Call service to check for restrictions

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6. Temperature too high or unit running too long

Possible Causes Response
A. Improper evaporator or condenser airflow A. Check for air restrictions
B. Dirty condenser B. Clean condenser
C. Iced evaporator C. Defrost and reset temperature
D. Malfunctioning fans D. Check both fans
E. Improper seals E. Check door gasket and opening
F. Improper area to be cooled F. Check for excessive load or incorrect installation
G. Low voltage G. Check power supply
H. Operating 60Hz unit at 50Hz (or vice versa) H. Use proper unit (60Hz for the Americas, 50Hz for the rest of the world)
I. Sealed system problem I. Call service to check for loss of refrigerant or restrictions
J. Undercharge or overcharge J. Call service to add or remove refrigerant

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7. House circuit tripping

Possible Causes Response
A. Incorrect fuse or breaker A. Check for proper fuse or breaker
B. Incorrect or loose wiring B. Check all wiring and connections
C. Failed components C. Call service

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8. Noisy operation

Possible Causes Response
A. Mounting area not firm A. Add support to improve installation
B. Loose parts B. Check fan blades, bearings, cabinet washers, tubing contact and loose screws.
C. Compressor overloaded due to high ambient temperatures or airflow restriction C. Check for airflow blockage
D. Malfunctioning components D. Call service to check for internal loose components, inadequate lubrication or incorrect wiring

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