Viessmann · Mini-split

EH31 Indoor external fan over voltage

Medium severity Viessmann DLFSHB high wall indoor

What the control is telling you

Over-voltage protection on the indoor fan supply. No flow chart in the manual.

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

Models that show this code

5 models in Viessmann DLFSHB high wall indoor

DLFSHBH09XAKDLFSHBH12XAJDLFSHBH12XAKDLFSHBH18XAKDLFSHBH24XAK

Other codes on the same units

EH0b Indoor PCB to display board communication error
EH02 Zero-crossing signal error
EH03 Indoor fan speed out of range
EH30 Indoor external fan low voltage
Eh60 Room sensor (T1) fault
Eh61 Indoor coil sensor (T2) fault
EL0C Refrigerant leak detected
EL01 Indoor / outdoor communication error

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