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ODU E8 Outdoor fan speed fault (outdoor board)

High severity Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor

What the control is telling you

Outdoor board display. Indoor shows EC07 (old F5).

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

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

7 models in Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK

Other codes on the same units

  • ODU E3 IPM to main board communication error (outdoor board)
  • ODU E4 Outdoor or T2B sensor fault (outdoor board)
  • ODU E5 Over or under voltage (outdoor board)
  • ODU E6 PFC module protection (outdoor board)
  • ODU Ed Adapter / inverter board to main board communication error
  • ODU F1 Zone A coil outlet sensor (T2B-A) fault
  • ODU F2 Zone B coil outlet sensor (T2B-B) fault
  • ODU F3 Zone C coil outlet sensor (T2B-C) 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 27 Outdoor Unit Digital Codes p.32; diagnosis p.58-59. 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.