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Viessmann · Mini-split

EC07 Outdoor fan speed out of range

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

What the control is telling you

Outdoor DC fan stays below 300 RPM or above 2400 RPM long enough to stop the unit. Outdoor board shows E8; 48K HH shows F5.

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

Likely causes

  • Fan blocked or loose
  • Bad fan motor
  • Wiring
  • Bad outdoor PCB

Test and repair steps

  1. Safety kill power at the disconnect and wait for the inverter capacitors to discharge before touching boards or wiring.
  2. Restart after 3 minutes. If it clears, the unit is fine.
  3. With power off, spin the fan by hand. Free the blade if it drags or rubs and check the blade nut is tight.
  4. Check the fan motor wiring at the board.
  5. Unplug the U-V-W fan connector and measure U-V, U-W, V-W. Unequal readings = replace the fan motor. Equal = replace the board.

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

  • d1 Demand response signal DR1 received
  • d2 Demand response signal DR2 received
  • d3 Demand response signal DR3 received
  • E1 Indoor / outdoor communication error
  • EC50 Outdoor temperature sensor fault
  • EC51 Outdoor EEPROM error
  • EC52 Condenser coil sensor (T3) fault
  • EC53 Outdoor ambient sensor (T4) fault

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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), Table 23 Outdoor Unit Error Display p.26; diagnosis p.58-59; Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.