Midea · Heat pump

PH91 Evaporator low temperature protection

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

What the control is telling you

The indoor coil temperature is too low (freeze protection, normally in cooling).

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

Likely causes

Low indoor airflow - dirty filter, blower problem
Low refrigerant charge
Low indoor load / low return air temperature
Indoor coil sensor fault

Test and repair steps

Check/replace the indoor filter and confirm the blower runs at the correct speed.
Let the coil thaw if iced.
Check refrigerant charge and leak-test.
Check the indoor coil temperature sensor.

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.