Error code
live-status-lamp-yellow-solid Reserve mode active
Applies to 1 model
F470
What this means
Reserve mode is active. The compressor and fans are stopped and the electric heater takes over; automatic heating control is not operating.
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 NIBE manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.