Source verified
Sullair STS compressor fault codes & warnings
Use this Sullair STS compressor fault code list to match the exact display message before troubleshooting. Coverage is based on Sullair STS Controller User Manual, part 02250241-178 R01; confirm applicability to your compressor package before acting.
How to use this Sullair fault code list
Start with the exact wording shown on the STS display. Open the matching entry below for the documented meaning, likely causes, operator-safe observations, service boundaries and OEM source page. If the wording on your controller does not match, verify the controller generation and machine-specific manual before using a nearby entry.
Pressure & capacity
Failed to Unload
Pressure & capacityOEM tracedHigh Interstage Pres
Pressure & capacityOEM tracedHigh Package Press / High Pressure A / B
Pressure & capacityOEM tracedHigh Sump Pressure
Pressure & capacityOEM tracedLow Line Pressure
Pressure & capacityOEM tracedLow Sump Pressure
Pressure & capacityOEM traced
Pressure & capacityOEM tracedHigh Interstage Pres
Pressure & capacityOEM tracedHigh Package Press / High Pressure A / B
Pressure & capacityOEM tracedHigh Sump Pressure
Pressure & capacityOEM tracedLow Line Pressure
Pressure & capacityOEM tracedLow Sump Pressure
Pressure & capacityOEM traced
Filters & pressure drop
Temperature & cooling
Electrical & motors
Electrical & control
CE Voltage Too High / Too Low
Electrical & controlOEM tracedController Watchdog
Electrical & controlOEM tracedHigh Voltage Failed
Electrical & controlOEM tracedIllegal State
Electrical & controlOEM tracedMemory Error
Electrical & controlOEM tracedPower Interruption
Electrical & controlOEM tracedUI Voltage Too High / Too Low
Electrical & controlOEM traced
Electrical & controlOEM tracedController Watchdog
Electrical & controlOEM tracedHigh Voltage Failed
Electrical & controlOEM tracedIllegal State
Electrical & controlOEM tracedMemory Error
Electrical & controlOEM tracedPower Interruption
Electrical & controlOEM tracedUI Voltage Too High / Too Low
Electrical & controlOEM traced
Sensors & control
Communication & control
Spiral valve
Dryer & air quality
Drive & VSD
Safety & control
Configuration
Maintenance & service
STS field guides
Sullair STS Warning vs Fault: What the Indicators Mean
The STS distinguishes amber maintenance/warning conditions from red faults. Learn what each state means before you reset anything.OEM basedHow to Use Sullair STS Event History During Troubleshooting
Use STS event history to preserve the sequence and timing of warnings and faults before parts are replaced or settings are changed.OEM basedSullair STS Troubleshooting: Safe First Checks Before Parts Replacement
A practical first-pass checklist based on Sullair’s troubleshooting guidance: inspect, record evidence and rule out simple external causes before replacing parts.OEM based
The STS distinguishes amber maintenance/warning conditions from red faults. Learn what each state means before you reset anything.OEM basedHow to Use Sullair STS Event History During Troubleshooting
Use STS event history to preserve the sequence and timing of warnings and faults before parts are replaced or settings are changed.OEM basedSullair STS Troubleshooting: Safe First Checks Before Parts Replacement
A practical first-pass checklist based on Sullair’s troubleshooting guidance: inspect, record evidence and rule out simple external causes before replacing parts.OEM based