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Midea · Heat pump

PC10 Outdoor low AC voltage protection

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

What the control is telling you

Incoming AC voltage is too low.

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

Likely causes

  • Supply voltage below 187 V
  • Loose connection at disconnect or terminal block
  • Undersized wire

Test and repair steps

  1. Warning: Live voltage testing - use proper PPE.
  2. Measure voltage at the outdoor terminal block with the unit running; acceptable range is 187-253 V.
  3. Tighten connections at the disconnect and terminal block.
  4. Check wire size and breaker per the electrical data (MCA/MOCP).
  5. Have the utility or electrician correct low supply voltage.

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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.