HVACopediaMidea · Heat pump
EC5C High pressure sensor failure
What the control is telling you
The outdoor board gets an invalid reading from the high-pressure sensor (transducer). Manual gives meaning only.
Applies to: DLCURAH18-60 AAK/ABK single-zone heat pump outdoor units (18K-60K, regular and High Heat)
Likely causes
- Sensor plug loose
- Damaged sensor wiring
- Failed high-pressure sensor
- Outdoor board fault
Test and repair steps
- 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.
- 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.
- Reseat the high-pressure sensor connector on the outdoor board.
- Inspect the sensor wiring for damage.
- Compare the sensor reading with a gauge on the service port (refer to the service manual for the sensor output).
- Replace the sensor if faulty; otherwise suspect the outdoor board.
Settings for these units
- Outdoor unit minimum clearances · Midea DLCURA ducted single-zone inverter heat pump (outdoor)
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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.