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Midea · Heat pump

PC00 Inverter module (IPM) protection

High severity Midea DLCURA ducted single-zone inverter heat pump (outdoor)

What the control is telling you

The compressor inverter module has shut down to protect itself (over-current/over-temperature/drive fault).

Applies to: DLCURAH18-60 AAK/ABK single-zone heat pump outdoor units (18K-60K, regular and High Heat)

Likely causes

  • Supply voltage problem
  • Poor heat transfer from IPM (heat sink)
  • Compressor mechanical/winding problem
  • Overcharge or high head pressure
  • Failed IPM / outdoor board

Test and repair steps

  1. Warning: Turn off and lock out power at the outdoor disconnect and wait for the inverter capacitors to discharge before touching the outdoor board or compressor wiring.
  2. Check supply voltage is within 187-253 V at the outdoor unit.
  3. Check the outdoor coil is clean and the fan is running - high head pressure overloads the inverter.
  4. Check compressor wiring (U/V/W) for loose or burnt terminals.
  5. Verify refrigerant charge per the installation instructions.
  6. If the fault repeats, test the compressor and replace the IPM/outdoor board per the service manual.

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Source: Midea/Carrier DLCURA Installation Instructions (Catalog DLCURA-03SI), Table 11 Outdoor Unit Diagnostic Codes, p.19. 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.