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ODU F6 Zone F coil outlet sensor (T2B-F) fault

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

What the control is telling you

T2B sensor for indoor unit F open or shorted.

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 the sensor plug on the board and the wire for damage.
  3. Unplug the sensor and measure its resistance. T1-T4 sensors read about 10 kOhm at 77 F (25 C); the discharge sensor (T5/TP) about 54.9 kOhm at 77 F. Compare with the sensor resistance tables.
  4. Out of range or open/shorted replace the sensor. Sensor reads fine: replace the board it plugs into.

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 F2 Zone B coil outlet sensor (T2B-B) fault
  • ODU F3 Zone C coil outlet sensor (T2B-C) fault
  • ODU F4 Zone D coil outlet sensor (T2B-D) fault
  • ODU F5 Zone E coil outlet sensor (T2B-E) fault
  • ODU Hz readout Compressor running frequency
  • ODU LC Low ambient cooling mode
  • ODU LP Low outdoor temperature protection (outdoor board)
  • ODU P0 Compressor top overheat (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.51. 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.