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 is | |
| pressure switch not |
| satisfied and shuts blower and solenoid off. When space | |
| shutting compressor off |
| warms up to set point, blower starts and the system | |
| when pressure drops |
| runs normally. | |
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| • Prolonged running without refrigerant flow will | |
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| damage or destroy compressor. If this condition exists, |
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| 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 in 1/4” | |
| refrigerant. | copper tube at condensing unit. If flashing with bubbles, | ||
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| call a CERTIFIED HVAC service technician for leak location, | |
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| 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 equipped, | Clean or replace filter | |
| 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 for bubbles | |
| refrigerant | after system has run for several minutes. If bubbles present, | ||
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| call a CERTIFIED HVAC service technican. If sight is clear of | |
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| bubbles, refrigerant level is OK. | |
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