Trouble shooting, Unit cycles on high pressure switch – Carrier 07KA User Manual
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TROUBLE SHOOTING
Unit Cycles on High Pressure Switch
1. Insufficient water pressure to unit?
2. Defective water control valve?
3. Condeftser water tube clogged?
4. Water drain line clogged?
5. Liquid Line valve closed?
6. Excessive refrigerant charge?
Unit Cycles on Low Pressure Switch
1. Defective expansion valve?
2. Unit short of refrigerant?
3. Fan not running?
4. Clogged filter?
5. Suction line valve closed?
6. Plugged capillary?
Unit Runs But Insufficient Cooling
1. Water control valve set too low?
2. Dirty air filter?
3. Low refrigerant charge?
4. Defective expansion valve?
5. Coil slightly iced, low air supply?
Unit Will Not Run; Contactor Open
1. Defective transformer?
2. Thermostat circuit open?
3. Faulty control relay?
4. Overload open?
5. High pressure switch open?
6. Low pressure switch open?
7. Loose electrical connection?
Unit Will Not Run; Contactor Closed
1. Loose lead at compressor?
2. Loose lead at contactor?
3. Motor winding open?
Manufacturer reserves the right to change any product specifications without notice.
Tab 4
07KA-1SS New
5-67 Codes C and MB Catalog No. 530-717