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| e-mail stedipower@tvss.net ::: Phone: 678.546.6780 |
Select a problem from the list below to see the possible causes and solutions. |
Switch to Refrigerant Troubleshooting Chart
Compressor will not run | |
| Probable Causes: | Possible Solutions: |
| 1. Main switch open | Close switch |
| 2. Fuse blown | Check electrical circuits and motor winding overloading. replace fuse after fault is corrected |
| 3. Thermal overloads tripped | Overloads are automatically reset. Check unit closely when unit comes back online |
| 4. Defective contactor or coil | Repair or replace |
| 5. System shut down by safety devices. | Determine type and cause of shutdown and correct it before resetting safety switch |
| 6. No cooling required | None. Wait until calls for cooling |
| 7. Liquid line solenoid will not open | Repair or replace coil |
| 8. Motor electrical trouble | Check motor for open windings, short circuit or burn out |
| 9. Loose wiring | Check all wire junctions--Tighten all terminal screws |
Compress or noisy or vibrating | |
| Probable Causes: | Possible Solutions: |
| 1. Flooding of refrigerant into crankcase | Check setting of expansion valves |
| 2. Improper piping support on suction or liquid line | Relocate, add or remove hangers |
| 3. Worn compressor | Replace |
| 4. Scroll compressor rotation reversed | Rewire for phase charge |
High discharge pressure | |
| Probable Causes: | Possible Solutions: |
| 1. Non-condensable in system | Remove the non-condensables |
| 2. System overcharges with refrigerant | Remove excess |
| 3. Discharge shutoff valve partially closed | Open Valve |
| 4. Fan not running | Check electrical circuit |
| 5. Head pressure control setting | Adjust |
| 6. Dirty condenser coil | Clean |
Low discharge pressure | |
| Probable Causes: | Possible Solutions: |
| 1. Faulty condenser temperature regulation | Check condenser control operation |
| 2. Suction shutoff valve partially closed | Open valve |
| 3. Insufficient refrigerant in system | Check for leaks--Repair and add charge |
| 4. Low suction pressure | Click here to go to the Low suction pressure section |
| 5. Variable head pressure valve | Check valve setting |
High suction pressure | |
| Probable Causes: | Possible Solutions: |
| 1. Excessive load | Reduce load or add additional equipment |
| 2. Expansion valve overfeeding | Check remote bulb. Regulate superheat |
Low suction pressure | |
| Probable Causes: | Possible Solutions: |
| 1. Lack of refrigerant | Check for leaks. Repair and add charge |
| 2. Evaporator dirty or iced | Clean |
| 3. Clogged liquid line filter drier | Replace cartridges |
| 4. Clogged suction line or compressor | Clean strainers |
| 5. Expansion valve malfunctioning | Check and reset for proper superheat |
| 6. Condensing temperature too low | Check means for regulating condensing temperature |
| 7. Improper TXV | Check for proper sizing |
Little or no oil pressure | |
| Probable Causes: | Possible Solutions: |
| 1. Clogged suction oil strainer | Clean |
| 2. Excessive liquid in crankcase | Check crankcase heater--Reset expansion valve for higher superheat--Check liquid line solenoid valve operation |
| 3. Low oil pressure safety switch defective | Replace |
| 4. Worn oil pump | Replace |
| 5. Oil pump reversing gear stuck in wrong position | Reverse direction of compressor rotation |
| 6. Worn bearings | Replace compressor |
| 7. Low oil level | Add oil and/or through defrost |
| 8. Loose fitting on oil lines | Check and tighten system |
| 9. Pump housing gasket leaks | Replace gasket |
Compressor loses oil | |
| Probable Causes: | Possible Solutions: |
| 1. Lack of refrigerant | Check for leaks and repair--Add refrigerant |
| 2. Excessive compression ring blow-by | Replace compressor |
| 3. refrigerant flood back | Maintain proper superheat at compressor |
| 4. Improper piping or traps | Correct piping |
Compressor thermal protector switch open | |
| Probable Causes: | Possible Solutions: |
| 1. Operating beyond design conditions | Add equipment to facilities so that conditions are within allowable limits |
| 2. Discharge valve partially shut | Open valve |
| 3. Blown valve plate gasket | Replace gasket |
| 4. Dirty condenser coil | Clean coil |
| 5. Overcharged system | Reduce charge |
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PHONE: (678) 546-6780 FAX: (678) 546-6782 | ||
Technical Support | Stedi-Power, Inc. | |
General Inquiries |
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Stedi-Power, Inc
5044 B U Bowman Drive #102
Buford, Georgia 30518
PHONE: (678) 546-6780
Last Updated: 07 Jun 2004
©1997-2004 Stedi-Power, Inc.
All trademarks are the property of their respective owners
All other rights reserved.
5044 B U Bowman Dr #102 ::: Buford, Georgia 30518