Error code
Inverter larm (0) Inverter alarm and compressor overload
Applies to 3 models
EX35, EX50, EX65
What this means
The inverter alarm indicates possible compressor overload, compressor or inverter failure, or an interrupted alarm circuit. On new installations, air in the system, poor water circulation, or an undersized radiator system are common causes. The circulation-water return temperature must not exceed 55 °C and hot-water temperature must not exceed 60 °C.
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.