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Viessmann · Mini-split

ODU P0 Compressor top overheat (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 PC02 (old P2).

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. Check indoor and outdoor airflow clear the inlets, outlets and coils.
  3. Leave power off 10 minutes so the compressor cools, then check whether the top is still above 194 F (90 C).
  4. Check the overload protector (OLP) plug and wiring. With the compressor cool, the OLP should read 0 ohms; open = replace the OLP.
  5. Check the refrigerant side for a leak or restriction and repair.
  6. If OLP and system are good, replace the outdoor control 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 F6 Zone F coil outlet sensor (T2B-F) fault
  • ODU Hz readout Compressor running frequency
  • ODU LC Low ambient cooling mode
  • ODU LP Low outdoor temperature protection (outdoor board)
  • ODU P1 High pressure protection (outdoor board)
  • ODU P2 Low pressure protection (outdoor board)
  • ODU P3 Current overload (outdoor board)
  • ODU P4 Discharge temperature protection (outdoor board)

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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.69. 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.