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EH0b Indoor PCB to display board communication error

Medium severity Midea DLFSHBH wall indoor (DLCM multi-zone)

What the control is telling you

The indoor main board gets no reply from the display board (table prints it as EH 0).

Applies to: DLFSHBH high wall indoor units 09-24K (Midea / Carrier / Viessmann) on DLC multi-zone or single-zone outdoor units

Likely causes

  • Loose display cable
  • Bad indoor PCB
  • Bad display board

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. Restart after 2 minutes.
  3. Check the display cable and plugs.
  4. Replace the indoor main PCB. If still there, replace the display board.

Models that show this code

5 models in Midea DLFSHBH wall indoor (DLCM multi-zone)

DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

  • EC56 Indoor coil outlet sensor (T2B) fault
  • EH00 Indoor EEPROM error
  • EH0A Indoor EEPROM error
  • EH02 Zero-crossing signal error
  • EH03 Indoor fan speed out of range
  • EH30 Indoor external fan low voltage
  • EH31 Indoor external fan over voltage
  • Eh60 Room sensor (T1) fault

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Source: Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17, p.31. 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.