Error code
PL1 input alarm PL1 input or X3:11 sensor-input fault
Applies to 3 models
RXC35, RXC50, RXC65
What this means
Terminal X3:11 is incorrectly connected or its sensor input has failed.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.
See the official ComfortZone manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.