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Midea · Mini-split

PC43 Compressor phase loss

High severity Midea DLCM(R/H)B multi-zone outdoorMidea DLFSHBH wall indoor (DLCM multi-zone)

What the control is telling you

One of the three compressor phases is missing.

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

Likely causes

  • Loose compressor lead
  • Bad compressor winding
  • Bad inverter module

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 2 minutes. If it clears, the unit is fine.
  3. Check both ends of the compressor leads (U, V, W) for loose or burnt terminals.
  4. Measure the three compressor windings. They must match. Unequal = replace the compressor.
  5. Windings good replace the outdoor main PCB / inverter module.

Models that show this code

12 models in Midea DLCM(R/H)B multi-zone outdoor, Midea DLFSHBH wall indoor (DLCM multi-zone)

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAKDLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • PC31 Low pressure protection
  • PC40 Main chip to compressor drive chip communication error
  • PC41 Current input detection protection
  • PC42 Compressor start failure
  • PC44 Zero speed protection
  • PC45 Compressor drive chip (IR / 341 PWM) failure
  • PC46 Compressor speed out of control
  • PC49 Compressor over-current

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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.71; 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.