Error code
51 Low-pressure alarm
Applies to 1 model
F470
What this means
The display example identifies alarm 51 as a low-pressure alarm. The underlying refrigeration fault requires professional diagnosis.
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.