Error code
Uppvärmning retur max larm Maximum heating-return-temperature alarm
Applies to 6 models
RX35, RX50, RX65, RXL35, RXL50, RXL65
What this means
The return-sensor temperature is too high, possibly because a circulation pump is not operating or the return sensor is incorrectly connected.
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 ComfortZone manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.