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Carrier · Mini-split

PC06 Discharge temperature protection

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

What the control is telling you

Discharge temperature stayed above 239 F (115 C) for 10 s; the compressor stops and restarts once it falls below 194 F (90 C). Outdoor board shows P4; 48K HH shows J2. The indoor manual lists a 226 F (108 C) / 9 s shutoff for its matched outdoor units.

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

Likely causes

  • Low charge / leak
  • Bad discharge sensor
  • Sensor wiring
  • Bad outdoor PCB

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. Confirm the discharge temperature really is high (over 239 F / 115 C) with a contact thermometer.
  3. Check the discharge sensor plug and wiring against the diagram, and measure the sensor (about 54.9 kOhm at 77 F).
  4. Check for a leak / low charge. Repair the leak and recharge.
  5. If charge and sensor are good, replace the outdoor main PCB.

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

  • PC0L Outdoor temperature too low
  • PC02 Compressor top overheat (OLP)
  • PC03 Pressure protection
  • PC04 Inverter compressor drive error
  • PC08 Outdoor over-current protection
  • PC10 Low AC supply voltage
  • PC11 AC supply voltage protection (over voltage)
  • PC12 DC bus high voltage / 341 MCE error

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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.66; Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17, safety features p.11. 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.