Viessmann · Mini-split

dF Defrost

Normal status Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoorViessmann DLFSHB high wall indoor

What the display is showing

Defrost in progress. Shown on the indoor display and on the outdoor board. Normal operation.

Applies to: DLCM(R/H)B multi-zone outdoor units with DLFSHBH high wall indoor units (Midea, Carrier, Viessmann)

Models that show this code

12 models in Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor, Viessmann DLFSHB high wall indoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAKDLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

ODU RO Oil return cycle
Off Timer off
On Timer on
SC Self clean running
SD Power abnormal detection
dE Demand response input error
nA No fault
nF Filter replacement reminder

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Source: Midea DLFSHBH09XAK indoor display table (photo, 2026-10-16); Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Display Function p.12; DLCMRBH/DLCMHBH Multi-Zone Outdoor Service Manual (sold as Midea, Carrier and Viessmann Vitocal 200-S; Viessmann doc 6225551-03, 12/2024) p.26, 28. 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.