Error code
live-status-lamp-yellow-solid Reserve mode status lamp
How it shows on the unit solid yellow status lamp
Applies to 1 model
F750
What this means
Reserve mode is active. The compressor is stopped and the electric heater is providing heating.
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.
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