HVACopedia

Carrier · Mini-split

ODU E6 PFC module protection (outdoor board)

High severity Carrier DLCM(R/H)B multi-zone outdoor

What the control is telling you

Outdoor board display; also shown when PFC protection happens 3 times in 15 minutes. Indoor shows PC0F.

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. Check the cable between the main board and the PFC (IPM) module.
  3. Measure DC across P and N on the IPM 277-356 V for 18-27K, 277-410 V for 36K.
  4. Check the PFC inductor the two leads should read about 0 ohms. Open = replace the inductor.
  5. Still faulty replace the PFC (IPM) module, then the outdoor main board.

Models that show this code

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

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK

Other codes on the same units

  • 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 E5 Over or under voltage (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
  • ODU F2 Zone B coil outlet sensor (T2B-B) fault

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

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.56-57. 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.