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PC0F PFC module protection

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

What the control is telling you

The PFC module signal to the main board is abnormal and the unit stops. Outdoor board shows E6 (it also shows E6 when this happens 3 times in 15 minutes); 48K HH shows J3.

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

Likely causes

  • Loose PFC cable
  • Bad PFC inductor
  • Bad PFC (IPM) module
  • Bad main board

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

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

  • P4 Compressor drive fault
  • P7 IPM temperature sensor fault
  • PC00 Inverter module (IPM) protection
  • PC0A Condenser high temperature protection
  • PC0L Outdoor temperature too low
  • PC02 Compressor top overheat (OLP)
  • PC03 Pressure protection
  • PC04 Inverter compressor drive error

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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.56-57; 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.