Carrier · Mini-split

ODU RO Oil return cycle

Normal status Carrier DLCM(R/H)B multi-zone outdoor

What the display is showing

Oil return run in progress.

Applies to: DLCMRBH / DLCMHBH multi-zone outdoor units 18-48K (Midea, Carrier, Viessmann Vitocal 200-S)

Models that show this code

7 models in Carrier DLCM(R/H)B multi-zone outdoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK

Other codes on the same units

ODU P1 High pressure protection (outdoor board)
ODU P2 Low pressure protection (outdoor board)
ODU P3 Current overload (outdoor board)
ODU P4 Discharge temperature protection (outdoor board)
ODU P5 Condenser high temperature (outdoor board)
ODU P6 Inverter module (IPM) fault (outdoor board)
ODU PH Compressor pre-heat
dF Defrost

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Source: DLCMRBH/DLCMHBH Multi-Zone Outdoor Service Manual (sold as Midea, Carrier and Viessmann Vitocal 200-S; Viessmann doc 6225551-03, 12/2024), Outdoor Unit Digital Display p.28; Automatic Wiring/Piping Correction p.6. Summarized in our own words; check the original manual for your model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.