Error code
H 11 Indoor/outdoor communication fault
Applies to 6 models
CS-NZ25YKE, CS-NZ35YKE, CS-NZ50YKE, CU-NZ25YKE, CU-NZ35YKE, CU-NZ50YKE
What this means
Abnormal communication between the indoor and outdoor units.
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.