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Viessmann · Mini-split

ODU P4 Discharge temperature protection (outdoor board)

High severity Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor

What the control is telling you

Outdoor board display. Indoor shows PC06.

Applies to: DLCMRBH / DLCMHBH multi-zone outdoor units 18-48K (Midea, Carrier, Viessmann Vitocal 200-S)

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

7 models in Viessmann Vitocal 200-S DLCM(R/H)B multi-zone outdoor

DLCMHBH24CAKDLCMHBH30DAKDLCMHBH36DAKDLCMHBH48EAKDLCMRBH18BAKDLCMRBH36DAKDLCMRBH48EAK

Other codes on the same units

  • ODU P0 Compressor top overheat (outdoor board)
  • ODU P1 High pressure protection (outdoor board)
  • ODU P2 Low pressure protection (outdoor board)
  • ODU P3 Current overload (outdoor board)
  • ODU P5 Condenser high temperature (outdoor board)
  • ODU P6 Inverter module (IPM) fault (outdoor board)
  • ODU PH Compressor pre-heat
  • ODU RO Oil return cycle

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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 27 Outdoor Unit Digital Codes p.32; diagnosis p.66. 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.