Carrier · 30XA/XAS/XB/XBP/XW Chillers
The thermistor monitoring the common heat fluid in a master/slave configuration has a fault. Master/slave operation will be disabled.
Click steps to track your progress.
Verify the wiring and connections for the common heat fluid thermistor.
Inspect the thermistor for any signs of wear or damage.
If the problem persists, contact Carrier Service.