| Problem |
| Possible cause |
| Corrective action |
|
|
| Leaks in connecting lines. |
| Inspect/replace faulty line or |
|
|
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| connection. | |
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|
|
| |
|
|
| Air in circulating lines. |
| Perform venting sequence in |
|
|
|
| Chapter 3. | |
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|
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| |
|
|
| Low fluid. |
| Check fluid level in sight glass. |
|
|
|
| Add fluid if required. | |
|
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| |
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|
| Defective | See Chapter 3. | |
|
|
| Water in fluid. |
| Drain water from low point in |
| Rapid drop in pressure/no |
|
| piping (see Chapter 3), or boil | |
|
|
|
| water off. | |
| pressure. |
|
|
| |
|
| Vent solenoid open. |
| Allow vent timer to run out; or, | |
|
|
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| ||
|
|
|
| check valve operation when unit | |
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|
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| is cold by opening the fill port. |
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|
|
| Check motor; rewire if |
|
|
| Pump running in reverse. |
| necessary. See electrical |
|
|
|
|
| diagrams. |
|
|
| Pump repair/adjustment needed. |
| Adjust head spacing or replace |
|
|
|
| worn pump components. | |
|
|
|
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| |
|
|
| V belt broken/worn. | Replace as required. | |
|
|
| Water in fluid. |
| Drain water from low point in |
| Noisy pump. |
|
| piping (see Chapter 3), or boil | |
|
|
|
| water off. | |
|
|
| Severely degraded fluid. |
| Drain and flush system. Replace |
|
|
|
| fluid. | |
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| |
Upright Portable Hot Oil TCUs | Chapter 6: Troubleshooting | 38 |
