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Daikin · Furnace

EAL R-32 refrigerant leak detected - mitigation mode

Critical severity Daikin DR96TN/DD96TN

What the control is telling you

The R-32 sensor on the indoor coil detected refrigerant. The furnace shuts off gas heat, runs the blower at maximum airflow and energizes the optional ventilation and alarm outputs. It returns to normal 5 minutes after the leak is no longer detected.

Applies to: Daikin DR96TN (upflow/horizontal) and DD96TN (downflow/horizontal) two-stage 96% furnaces with 9-speed ECM motor, R-32 ready

Likely causes

  • Refrigerant leak at the indoor coil or nearby line set
  • A2L verification test (A2u menu) running

Test and repair steps

  1. Warning: R-32 is a mildly flammable (A2L) refrigerant - ventilate the area and keep ignition sources away.
  2. Check whether someone started the A2L verification test (A2u menu = yes); it ends after 5 minutes or when turned off.
  3. Leak-check the indoor coil and line set and repair the leak.
  4. Let the furnace finish its 5-minute post-leak fan run; it then drops the ventilation/alarm outputs and goes back to normal operation.

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Source: Daikin RSD6612304 (DR96TN/DD96TN service), 2 Stage Troubleshooting Codes, p.28-29; R-32 Information p.10. 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.