Error code
Okänd VP-låda larm Unknown heat-pump-box alarm and communication fault
Applies to 3 models
EX35, EX50, EX65
What this means
The controller cannot identify the heat-pump box, probably because of a poor electrical connection or incorrect wiring. This is a communication or identification fault.
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.