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| HM7000 and HU2000 |
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| Troubleshooting Chart |
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| Symptom | Possible Cause(s) | Corrective Action |
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| Compressor will not run | 1. Loss of power or overheating | 1. Check for proper use of extension cord (see |
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| EXTENSION CORDS, page 3) |
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| 2. No electrical power | 2. Plugged in? Check fuse/breaker or motor overload |
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| 3. Blown fuse | 3. Replace blown fuse |
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| 4. Breaker open | 4. Reset, determining why problem happened |
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| 5. Thermal overload open | 5. Motor will restart when cool; turn off compressor and |
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| wait 20 minutes. |
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| 6. Pressure switch bad | 6. Replace |
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| Motor hums but cannot | 1. Low voltage | 1. Check with voltmeter |
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| run or runs slowly | 2. Wrong gauge wire or length of | 2. Check gauge chart, under Operation for proper |
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| extension cord | gauge wire and cord length |
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| 3. Shorted or open motor winding | 3. Replace motor |
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| 4. Defective check valve or unloader | 4. Replace or repair |
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| Fuses blow/circuit | 1. Incorrect size fuse, circuit overloaded | 1. Check for proper fuse, use |
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| breaker trips repeatedly |
| Disconnect other electrical appliances from circuit or |
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| operate compressor on its own branch circuit |
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| 2. Wrong gauge wire or length of | 2. Check gauge chart, under Operation |
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| extension cord |
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| 3. Defective check valve or under loader | 3. Replace or repair |
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| Thermal overload | 1. Low voltage | 1. Check with voltmeter |
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| protector cuts out | 2. Clogged air filter | 2. Clean filter (see Maintenance section) |
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| repeatedly | 3. Lack of proper ventilation/room | 3. Move compressor to well ventilated area |
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| temperature too high |
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| 4. Wrong gauge wire or length of | 4. Check gauge chart, under Operation |
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| extension cord |
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| Air receiver pressure | 1. Loose connections (fittings, tubing, | 1. Check all connections with soap and water solution |
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| drops when compressor | etc.) | and tighten |
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| shuts off | 2. Loose drain lock | 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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| Excessive moisture in | 1. Excessive water in air receiver | 1. Drain receiver |
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| discharge air | 2. High humidity | 2. Move to area of less humidity; use air line filter |
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| Compressor runs | 1. Defective pressure switch | 1. Replace switch |
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| continuously | 2. Excessive air usage | 2. Decrease air usage; compressor not large enough for |
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| a requirement |
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| 3. Check valve leaking | 3. Disassemble check valve assembly, clean or replace |
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| Compressor vibrates | Loose mounting bolts | Tighten |
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| Air output lower than | 1. Broken inlet valves | 1. Have authorized service representative repair unit |
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| normal | 2. Intake filter dirty | 2. Clean or replace intake filter |
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| 3. Connections leaking | 3. Tighten connections |
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