Error code
Uppvärmning retur max larm Maximum heating-return-temperature alarm
Applies to 3 models
EX35, EX50, EX65
What this means
The heating return temperature is too high. The manual directs the user to the inverter-alarm checks.
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.