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 | a. | Check for power cord plug |
| b. | No power to unit | b. | Check power at receptacle & fuses |
| c. | Temperature setting high | c. | Lower temperature setting |
| d. | Low voltage. | d. | Contact an authorized electrician |
| e. | Incorrect or loose wirings. | e. | Check all wirings and connections |
| f. | Defrost light blinking | f. | Under defrost |
| g. | Running light blinking | g. | Call service for failed components |
|
|
|
| |
2. Compressor | stopping and starting but short | running time | ||
| a. | Incorrect temperature setting | a. | Set 55 to 60 °F |
| b. | Incorrect voltage | b. | Check for voltage |
| c. | Failed thermistor | c. | Check thermistor by placing it in ice |
| d. | Failed components |
| water and measuring resistance |
| d. | Check compressor windings, start | ||
| e. | Improper condenser airflow |
| relay and overload protector. |
| 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 | h. | Call service for OEM information |
|
| high |
|
|
3. Fan motor | running but compressor not running |
| ||
| a. | Incorrect power supply | a. | Check for proper voltage |
| b. | Incorrect or loose wirings | b. | Check all wirings and connections |
| c. | Failed components | c. | Check start relay, start capacitor, |
|
|
|
| overload protector, compressor. |
| d. | Liquid refrigerant in the compressor | d. | Call service for OEM information. |
4. Compressor | running but fan not running |
|
| |
| a. | Fan blade bond | a. | Check for proper clearance |
| b. | Incorrect or loose wirings | b. | Check all wirings |
| c. | Failed motors | c. | Call service for checking open or |
|
|
|
| shorted windings |
5. No cooling | but compressor and fan running |
|
| |
| 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 for checking restrictions |
6. Temperature | too high or unit running too long |
| ||
| a. | Improper evaporator or condenser | a. | Check for air restrictions |
|
| airflow |
|
|
| b. | Dirty Condenser | b. | Clean condenser |
| c. | Iced evaporator | c. | Defrost and reset temperature |
| d. | Malfunctioning fans | d. | Check for both fans |
| e. | Improper seals | e. | Check for gasket and door opening |
| f. | Improper area to be cooled. | f. | Check for excessive load incorrect |
|
|
|
| installation |
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