What it means
Electronic spiral-valve operation has been blocked by an abnormal operating condition such as component temperature.
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
- Operating condition outside the spiral-valve driver’s acceptable range
- High ambient condition
- Low-temperature startup
Operator-safe first checks
- Record ambient temperature and whether the message clears as normal operating conditions return.
- Avoid forcing capacity changes while the spiral-valve system is inhibited.
Trained maintenance / service checks
- Check environmental and startup conditions against machine specifications.
- If the warning persists at normal conditions, continue with spiral-valve driver diagnostics.
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: 34.