Midea · Heat pump

PC0L Outdoor unit low-temperature protection

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

What the control is telling you

Outdoor ambient is below the unit's operating range, so it stops. Operating range: regular models heat down to -5°F (-15°C), High Heat models to -22°F (-30°C); cooling down to 5°F (regular) / -22°F (High Heat).

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

Likely causes

Outdoor temperature below operating limit
T4 sensor reading incorrectly

Test and repair steps

Compare actual outdoor temperature with the model's operating range.
If the outdoor temperature is within range, check the T4 ambient sensor.
Use backup/supplemental heat (terminal W / D) while below range.

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.

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.