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PC08 Outdoor over-current protection

High severity Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoorViessmann DLFSHB high wall indoor

What the control is telling you

Outdoor current went over its limit. Outdoor board shows P3; 48K HH shows F0.

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

Likely causes

  • High outdoor temperature
  • Poor outdoor airflow / dirty coil
  • Restriction or overcharge
  • Reactor fault
  • 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. Measure the input current on the supply wire. Limits: 15 A on 18K; 18.5 A on 27K and 18K high heat; 22.5 A on 36K and 27K high heat; 28 A on 48K and 36K high heat.
  3. Outdoor air above 122 F (50 C) = outside the range, shut it down.
  4. Check outdoor airflow and clean the coil.
  5. Check for a refrigerant restriction. If blocked: recover the charge, blow the lines through with nitrogen, evacuate and recharge.
  6. If none of the above, replace the outdoor main board (or the electric control box) and retest.

Models that show this code

12 models in Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor, Viessmann DLFSHB high wall indoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAKDLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • PC02 Compressor top overheat (OLP)
  • PC03 Pressure protection
  • PC04 Inverter compressor drive error
  • PC06 Discharge temperature protection
  • PC10 Low AC supply voltage
  • PC11 AC supply voltage protection (over voltage)
  • PC12 DC bus high voltage / 341 MCE error
  • PC30 High 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.64-65; Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17, p.33. 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.