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Viessmann · Mini-split

ODU E5 Over or under voltage (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 PC10/PC11/PC12 (old P1).

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. Measure supply voltage L1-L2 at the outdoor unit: about 187-253 VAC is acceptable.
  3. Measure DC across P and N on the IPM board: 277-356 V for 18-27K, 277-410 V for 36-48K.
  4. On 2-3 zone units also check DC across the bridge rectifier + and -: 190-250 V is normal.
  5. If the supply is good, replace parts in this order and retest: bridge rectifier (4-5 zone units), IPM board, outdoor main 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 E0 Outdoor EEPROM error (outdoor board)
  • ODU E2 Indoor / outdoor communication error (outdoor board)
  • ODU E3 IPM to main board communication error (outdoor board)
  • ODU E4 Outdoor or T2B sensor fault (outdoor board)
  • ODU E6 PFC module protection (outdoor board)
  • ODU E8 Outdoor fan speed fault (outdoor board)
  • ODU Ed Adapter / inverter board to main board communication error
  • ODU F1 Zone A coil outlet sensor (T2B-A) 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.52-55. 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.