What it means
The STS is reporting a general malfunction from an integrated or connected dryer.
This entry is tied to the exact STS message family documented by Sullair. The same words can mean something different on another controller generation, so confirm the displayed message and machine documentation before acting.
Likely causes
- General dryer malfunction reported to the controller
Operator-safe first checks
- Check the dryer display for its own alarm or fault code.
- Record compressor and dryer messages together.
- Avoid bypassing dryer interlocks to keep the package running.
Trained maintenance / service checks
- Use the dryer-specific manual to diagnose the underlying dryer fault.
- Verify interconnect wiring only under the appropriate electrical safety procedure.
Reset or keep running?
Do not use repeated resets as a substitute for diagnosis. If the condition involves electrical power, a motor overload, high pressure, loss of cooling, abnormal temperature, or a safety circuit, correct the underlying problem before returning the compressor to service.
Source confidence
OEM VERIFIED
This message and its troubleshooting direction are traced to the Sullair STS controller troubleshooting guide.
Source: Sullair STS Controller User Manual, part 02250241-178 R01. Referenced manual page: 30.