Error code
03 Outdoor return-signal or intermittent protection fault
Applies to 4 models
RAS-25PKVSG-ND, RAS-35PKVSG-ND, RAS-25PAVSG-ND, RAS-35PAVSG-ND
What this means
The outdoor unit initially returned a signal but later stopped responding. Possible causes include instantaneous power loss, hardware protection, high temperature or pressure, or indoor/outdoor signal-circuit failure.
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.