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EH0b Indoor PCB to display board communication error

Medium severity Carrier DLFSHB high wall indoor

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 Carrier DLFSHB high wall indoor

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.