Atlas Copco XATS 156 DD troubleshooting: 4 fault codes and 31 symptom-cause-remedy entries from the manufacturer's own service documentation.
Atlas Copco XATS 156 DD — full specs, parts & maintenance.
| Code | Meaning |
|---|---|
| H3 | Indicación de carga |
| H5 | Temperatura de salida del motor alta |
| H6 | Presión de aceite baja |
| H7 | Fluido refrigerante insuficiente |
| Symptom | Cause | Remedy |
|---|---|---|
| Compressor is loaded automatically to full capacity after starting | Loading valve stuck in loading position | Remove and dismantle loading valve. Correct if necessary. |
| Compressor is loaded automatically to full capacity after starting | Air intake throttle valve stuck in opened position | Check and, if necessary consult Atlas Copco. |
| Compressor is loaded automatically to full capacity after starting | Air leaks in regulating system | Check hoses and their fittings. Stop leaks; replace leaking hoses. |
| Unit does not load after pressing the loading button | Regulating valve defective | Check and if necessary consult Atlas Copco. |
| Engine does not speed up immediately after compressor loading valve button has been pressed and compressor does not deliver air | Regulating valve defective | Check and, if necessary consult Atlas Copco. |
| Engine does not speed up immediately after compressor loading valve button has been pressed and compressor does not deliver air | Air intake throttle valve stuck in closed position | Check and, if necessary consult Atlas Copco. |
| Excessive compressor oil consumption. Oil mist being discharged from air outlet valves | Compressor oil level too high | Check oil level. Release pressure and drain oil to correct level. |
| Compressor capacity or pressure below normal | Air consumption exceeds capacity of compressor | Check equipment connected. |
| Compressor capacity or pressure below normal | Choked air filter elements | Remove and inspect elements. |
| Compressor capacity or pressure below normal | Unloading valve not completely open | Check and, if necessary consult Atlas Copco. |
| Compressor does not unload and engine keeps running at max. speed when closing the air outlet valves, safety valve blows | Regulating valve incorrectly set or defective | Check and, if necessary consult Atlas Copco. |
| Compressor does not unload and engine keeps running at max. speed when closing the air outlet valves, safety valve blows | Air leaks in regulating system | Check hoses and their fittings. Stop leaks and, if necessary consult Atlas Copco. |
| Compressor does not unload and engine keeps running at max. speed when closing the air outlet valves, safety valve blows | Unloading valve stuck | Check and, if necessary consult Atlas Copco. |
| Working pressure rises during operation and causes safety valve to blow | Regulating valve incorrectly set or defective | Check and, if necessary consult Atlas Copco. |
| Working pressure rises during operation and causes safety valve to blow | Air leaks in regulating system | Check hoses and their fittings. Stop leaks and, if necessary consult Atlas Copco. |
| Working pressure rises during operation and causes safety valve to blow | Unloading valve stuck | Check and, if necessary consult Atlas Copco. |
| Working pressure rises during operation and causes safety valve to blow | Safety valve defective | Check safety valve; consult Atlas Copco. |
| After working some time, the unit stops through a shutdown switch | Fuel tank contains insufficient fuel | Fill fuel tank. |
| After working some time, the unit stops through a shutdown switch | Air in fuel system, or insufficient fuel supply | Check filters and hoses for leaks, dirt and bends. |
| After working some time, the unit stops through a shutdown switch | Engine oil pressure too low | Refer to the engine instruction manual. |
| After working some time, the unit stops through a shutdown switch | Engine temperature too high | See corrective actions 15. |
| After working some time, the unit stops through a shutdown switch | Compressor temperature too high | See corrective actions 16. |
| After working some time, the unit stops through a shutdown switch | Low coolant level | Top up cooling system. |
| Air and oil mist expelles from air filters immediately after stopping | Unloader valve jammed | Check and, if necessary consult Atlas Copco. |
| Air and oil mist expelles from air filters immediately after stopping | Wrong oil type (without foam-retarding additives) | Consult Atlas Copco. |
| Engine overheating | Insufficient engine cooling | Relocate compressor. |
| Engine overheating | Engine oil cooler clogged externally | Clean engine oil cooler. Refer to section Cleaning coolers. |
| Compressor overheating | Insufficient compressor cooling | Locate compressor away from walls; when banked with other compressors, leave space between them. |
| Compressor overheating | Oil cooler clogged externally | Clean oil cooler. Refer to section Cleaning coolers. |
| Compressor overheating | Oil level too low | Check oil level. Top up with recommended oil. |
| After working for some time, the unit stops for no apparent reason | Air in fuel system, or insufficient fuel supply | Check filters and hoses for leaks, dirt and bends. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Fuel tank contains insufficient fuel; Air in fuel system, or insufficient fuel supply; Engine oil pressure too low; Engine temperature too high. See the table for the matching fixes.
Documented causes: Regulating valve incorrectly set or defective; Air leaks in regulating system; Unloading valve stuck; Safety valve defective. See the table for the matching fixes.
Documented causes: Loading valve stuck in loading position; Air intake throttle valve stuck in opened position; Air leaks in regulating system. See the table for the matching fixes.