HVACopediaViessmann · Mini-split
EL0C Refrigerant leak detected
What the control is telling you
The indoor coil (T2) did not drop at least 2 C below its start value within 5 minutes of compressor start, 3 times. Display shows EC and the unit stops.
Applies to: DLFSHBH high wall indoor units 09-24K (Midea / Carrier / Viessmann) on DLC multi-zone or single-zone outdoor units
Likely causes
- Low charge / leak
- T2 sensor loose or bad
- Blockage
- Bad indoor PCB
Test and repair steps
- Safety kill power at the disconnect and wait for the inverter capacitors to discharge before touching boards or wiring.
- Restart after 2 minutes.
- Feel the indoor discharge air in cooling. No cold air: check for leaks and blockages, repair and recharge.
- Cold air but code returns check the T2 sensor is clipped on and reads right; then replace the indoor PCB.
Models that show this code
5 models in Viessmann DLFSHB high wall indoor
Other codes on the same units
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Source: Carrier MS-DLFSHB-01 High Wall Ductless Service Manual (04/2021), Table 9 p.17, p.32. Summarized in our own words; check the original manual for your model.
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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.