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Midea · Heat pump

PC42 Compressor start failure

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

What the control is telling you

The compressor failed to start.

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

Likely causes

  • Loose/incorrect compressor U-V-W wiring
  • Low supply voltage
  • Compressor locked or winding fault
  • IPM/drive board fault
  • Unequalized pressures

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 compressor terminal wiring for tight, correct connections.
  3. Check supply voltage is within 187-253 V.
  4. Check compressor windings for balanced resistance and no short to ground (refer to service manual values).
  5. Allow pressures to equalize and retry.
  6. Replace the drive board or compressor as indicated.

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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.

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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.