Kaeser Compressor Error Codes — Quick Reference
Kaeser screw compressors with Sigma Control controllers report warnings and shutdowns for temperature, pressure, service intervals, and sensor faults. The Sigma Control panel may show text alarms rather than short numeric codes, depending on controller generation.
| Alarm | Meaning | Quick Fix |
|---|---|---|
| Final Compression Temp High | Compressor too hot | Clean coolers; check oil |
| Motor Protection Trip | Main motor overload | Check load and contactor |
| Sensor Fault | Bad temp/pressure sensor | Inspect and replace sensor |
| Dryer Fault | Integrated dryer issue | Check condenser and dryer circuit |
| Service Due | Scheduled maintenance due | Perform PM and reset counter |
| Emergency Stop | E-stop active | Reset and inspect loop |
| Pressure Switch Fault | Control pressure issue | Check transducer and loading controls |
| Phase Fault | Supply power issue | Check voltage balance |
Most Common Faults
Final Compression Temperature High
Kaeser packages are efficient, but they still depend on clean cooling surfaces and correct oil flow. Blow out coolers, verify cabinet fans run properly, and confirm the oil level is correct with the unit in the proper state per Kaeser instructions.
Sensor Fault
Before replacing expensive valves or motors, compare the controller reading to an independent gauge or temperature probe. Kaeser sensor failures are common enough that a bad sensor should always be on the suspect list.
Dryer Fault
If the package has an integrated refrigerated dryer, the dryer can trip independently of the compressor. Check condenser cleanliness, ambient temperature, and whether the dryer fan is running.
Parts Often Needed
| Part | Notes |
|---|---|
| Temperature or pressure sensor | Amazon | Common controller alarm source |
| Service kit | Amazon | Oil, separator, filters |
| Cabinet fan | Amazon | Overheat alarms often trace here |
| Dryer condenser fan / contactor | Amazon | On integrated dryer faults |
When to Call a Pro
Kaeser Sigma Control diagnostics are much easier with factory documentation and service access. If alarms persist after PM work, involve a Kaeser-trained compressor tech before the airend is damaged.