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Carrier · Mini-split

PC0A Condenser high temperature protection

Medium severity Carrier DLCM(R/H)B multi-zone outdoorCarrier DLFSHB high wall indoor

What the control is telling you

Outdoor coil pipe reached 149 F (65 C), so the unit shut off. It restarts below 125.6 F (52 C). Outdoor board shows P5; 48K HH shows J0.

Applies to: DLCM(R/H)B multi-zone outdoor units with DLFSHBH high wall indoor units (Midea, Carrier, Viessmann)

Likely causes

  • Bad T3 sensor
  • Dirty coil / poor airflow
  • Outdoor fan problem
  • Restriction

Test and repair steps

  1. Safety kill power at the disconnect and wait for the inverter capacitors to discharge before touching boards or wiring.
  2. Check the condenser (T3) sensor connection and resistance (about 10 kOhm at 77 F).
  3. If outdoor air is above 122 F (50 C), the unit is outside its range: shut it down.
  4. Check outdoor airflow, clean the coil, and make sure the outdoor fan runs (see EC07 if not).
  5. Check the charge. If low, find the leak and add refrigerant. If all good, replace the outdoor main board.

Models that show this code

12 models in Carrier DLCM(R/H)B multi-zone outdoor, Carrier DLFSHB high wall indoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAKDLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • P3 Low outdoor temperature cut-off in heating
  • P4 Compressor drive fault
  • P7 IPM temperature sensor fault
  • PC00 Inverter module (IPM) protection
  • PC0F PFC module protection
  • PC0L Outdoor temperature too low
  • PC02 Compressor top overheat (OLP)
  • PC03 Pressure protection

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Source: DLCMRBH/DLCMHBH Multi-Zone Outdoor Service Manual (sold as Midea, Carrier and Viessmann Vitocal 200-S; Viessmann doc 6225551-03, 12/2024), Table 23 Outdoor Unit Error Display p.26; diagnosis p.67; Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17. 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.