Carrier · 30XA/XAS/XB/XBP/XW Chillers
The system cannot verify the slide valve control on circuit A. No action is taken by the unit, but this indicates a potential problem.
Click steps to track your progress.
Check the wiring of the solenoid valves for circuit A.
Inspect the current transformer for any defects.
Contact Carrier Service if the slide valve control remains unverifiable.