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Midea · Heat pump

EC57 refrigerant pipe temperature sensor fault

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

What the control is telling you

The outdoor board reads the refrigerant pipe temperature sensor as open or shorted. Manual gives the meaning only; steps are standard sensor checks.

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

Likely causes

  • Sensor connector loose or unplugged on outdoor board
  • Damaged sensor wire
  • Failed sensor
  • Outdoor main board input fault

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 the indoor unit display code first - the manual says indoor codes often point to the outdoor problem; see the service manual for detailed tests.
  3. Find the refrigerant pipe temperature sensor plug on the outdoor main board and reseat it.
  4. Inspect the sensor lead for cuts, chafing or crushed sections.
  5. Unplug the sensor and check it for open or short circuit with an ohmmeter (compare to the service manual resistance chart).
  6. Replace the sensor if open/shorted; if the sensor checks good, suspect the outdoor main board.

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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.