Error code
4 Indoor control-system fault
Applies to 7 models
MSZ-GE22VA - E1, MSZ-GE25VA - E1, MSZ-GE35VA - E1, MSZ-GE42VA - E1, MSZ-GE50VA - E1, MSZ-GE60VA - E1, MSZ-GE71VA - E1
What this means
The indoor electronic control system cannot correctly read stored control-board data.
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.