| 7. | System low on | Check refrigerant “sight glass” in 1/4” tubing. |
| refrigerant. | Check for bubbles after system has run for several | |
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| minutes. If bubbles present, call a CERTIFIED HVAC service |
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| technician. If sight is clear of bubbles, refrigerant level is OK. |
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| 8. | Thermostatic | System will operate as if it were low on refrigerant charge. |
| expansion valve power | Sight glass will be clear. Evaporator coil icing probable. | |
| element losing its | Call a CERTIFIED HVAC service technician. | |
| charge. |
| |
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| 9. | Low voltage to | Low voltage will cause compressor overheating and |
| compressor, below | tripping on overload. Also, can have difficulty starting. This | |
| 103V with compressor | is usually a field wiring problem which should be corrected | |
| running. | immediately. | |
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| |
| 10. Cooling system not | If system is determined to run OK but not keeping up, run a | |
| sufficient for load | heat gain calculation for the wine cellar and compare with | |
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| cooling system capacity. |
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| |
Evaporator blower runs, but compressor does not | |||
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| 1. | System | Observe for several minutes. Compressor should turn on |
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| at termination of “Anti Frost“ Cycle and evaporator clear of |
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| frost. |
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| 2. | Power off to | Check breaker/Refer to #3 above |
| compressor. |
| |
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| 3. | Out of refrigerant. | Call a CERTIFIED HVAC service technician to locate leak, |
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| repair and charge with refrigerant |
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| 4. | Compressor off on | Determine if compressor is hot. If not, there is another |
| overload. | problem. If yes, shut off power to condensing unit and call | |
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| service technician |
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| 5. | Liquid line solenoid | Remove cover. Locate valve in ¼” copper tube. Check to |
| valve in evaporator not | see if it is hot. If hot and you can feel a magnetic pull with a | |
| active. | screwdriver, the valve is working. If cold, there is no power | |
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| to the valve coil. In this event, with the blower running, the |
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| valve should be powered. Call a CERTIFIED HVAC service |
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| technician. |
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| 6. | Thermostat | System will “pump down.” Compressor will stop. |
| expansion valve power | May start occasionally and shut off quickly. | |
| element lost charge | Call a CERTIFIED HVAC service technician. | |
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