Compressor runs, but evaporator does not
| 1. Faulty blower | • Evaporator coil probably frozen |
| motor or broken wire | • Shut off power to condensing unit |
| connection | |
| • Call a CERTIFIED HVAC service technician for repair | |
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| 2. Defective low | • Compressor would continue to run when thermostat |
| pressure switch not | is satisfied and shuts blower and solenoid off. When |
| shutting compressor off | space warms up to set point, blower starts and the |
| when pressure drops | system runs normally. |
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| • Prolonged running without refrigerant flow will |
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| damage or destroy compressor. If this condition |
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| exists, call a CERTIFIED HVAC service technician. |
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Compressor short cycles, which is different from running intermittently | ||
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| 1. System pressure | Call a CERTIFIED HVAC service technician to verify and |
| controls defective. | repair. |
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| 2. System low on | Observe for flashing in refrigerant sight glass located |
| refrigerant. | in 1/4” copper tube at condensing unit. If flashing with |
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| bubbles, call a CERTIFIED HVAC service technician for |
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| leak location, repair, and adding refrigerant. |
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| 3. Condenser fan motor | • Fan does not run with compressor. |
| defective | • ¼” copper tube at sight glass – very hot, compressor |
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| very hot, runs short time, shuts off. |
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| • Shut power off to condensing unit |
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| • Call a CERTIFIED HVAC service technician for repair. |
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| 4. Compressor starting | • Compressor very hot and hums when trying to start. |
| components defective. | • Shut power off to condensing unit. |
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| • Call a CERTIFIED HVAC service technician. |
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Evaporator coil freezes |
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| 1. Air filter, if | Clean or replace filter |
| equipped, dirty |
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| 2. Evaporator coil and/ | Clean coil and blower |
| or blower dirty |
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| 3. Thermostat set point | Set point should not be lower than 50°. If so, increase to |
| too low. | above 50° |
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| 4. System low on | Check refrigerant “sight glass” in 1/4” tubing. Check |
| refrigerant | for bubbles after system has run for several minutes. If |
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| bubbles present, call a CERTIFIED HVAC service technican. |
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| If sight is clear of bubbles, refrigerant level is OK. |
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