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Midea · Mini-split

PC04 Inverter compressor drive error

High severity Midea DLFSHBH wall indoor (DLCM multi-zone)

What the control is telling you

Compressor drive problem reported to the indoor unit.

Applies to: DLFSHBH high wall indoor units 09-24K (Midea / Carrier / Viessmann) on DLC multi-zone or single-zone outdoor units

Likely causes

  • Wiring
  • Bad IPM
  • Outdoor fan problem
  • Bad compressor
  • Bad 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. Check the supply is 208-230 V, 1 phase, 60 Hz and the power leads are tight.
  3. Measure DC across P and N on the IPM 277-356 V on 18-27K units, 277-410 V on 36-48K units.
  4. Check the cable between the main board and the IPM, the compressor leads, and every terminal in the electrical box.
  5. Check the bridge rectifier (no terminal pair should read 0 ohms) and each reactor lead for an open.
  6. Make sure the outdoor fan runs and the unit can breathe. If the fan is the problem, follow the fan fault (EC07).
  7. Check compressor winding resistance (should be equal on all three pairs).
  8. Replace in this order and retest each time: IPM module, outdoor main board, compressor.

Models that show this code

5 models in Midea DLFSHBH wall indoor (DLCM multi-zone)

DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • PC0F PFC module protection
  • PC0L Outdoor temperature too low
  • PC02 Compressor top overheat (OLP)
  • PC03 Pressure protection
  • PC06 Discharge temperature protection
  • PC08 Outdoor over-current protection
  • PC10 Low AC supply voltage
  • PC11 AC supply voltage protection (over voltage)

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Source: Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), p.37. 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.