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Oilless Compressors
Troubleshooting Chart
SymptomPossible Cause(s)Corrective Action
| Compressor will not run | 1. No electrical power | 1. | Plugged in? Check fuse/breaker or motor overload | ||
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| 2. | Breaker open | 2. | Reset, determine cause of problem | |
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| 3. | Pressure switch bad | 3. | Replace |
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| 4. | Check valve defective | 4. | Remove and replace check valve | |
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| ! DANGER | Do not disassemble check valve | |
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| with air in tank; bleed tank | ||
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| Motor hums but cannot | 1. Poor contacts, line voltage incorrect | 1. | Check connections, check with voltmeter | ||
| run or runs slowly | 2. Shorted or open motor winding | 2. | Replace motor |
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| 3. | Defective check valve or unloader | 3. | Replace or repair |
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| ! DANGER | Do not disassemble check valve | |
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| with air in tank; bleed tank | ||
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Fuses blow/circuit | 1. Incorrect size fuse, circuit overloaded |
breaker trips repeatedly |
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! CAUTION
2. Defective check valve or unloader
Never use an extension cord with this product
1.Check for proper fuse, use
2.Replace or repair
! DANGER | Do not disassemble check valve |
with air in tank; bleed tank |
Tank pressure drops when compressor shuts off
1. | Loose connections (fittings, tubing, | 1. | Check all connections with soap and water solution | ||
| etc.) |
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| and tighten |
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2. | Loose drain cock | 2. | Tighten |
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3. | Check valve leaking | 3. | Disassemble check valve assembly, clean or replace | ||
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| Do not disassemble check valve |
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| with air in tank; bleed tank | ||
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Air output lower than normal/low discharge pressure
1. | Air leaks in piping (on machine or in | 1. | Replace leaking components or tighten as necessary |
| outside system) |
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2. | Piston ring broken | 2. | Replace |
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