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PC10 Low AC supply voltage

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

What the control is telling you

Supply voltage to the outdoor unit is too low. Outdoor board shows E5; 48K HH shows P1.

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

Likely causes

  • Low supply voltage
  • Loose wiring
  • Bad IPM or 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. 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

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

  • PC03 Pressure protection
  • PC04 Inverter compressor drive error
  • PC06 Discharge temperature protection
  • PC08 Outdoor over-current protection
  • PC11 AC supply voltage protection (over voltage)
  • PC12 DC bus high voltage / 341 MCE error
  • PC30 High pressure protection
  • PC31 Low pressure protection

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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.42, 52-55; 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.