HVACopedia

Midea · Furnace

LED2 green 2 flashes Refrigerant concentration above alarm limit (leak)

Critical severity Midea 96% AFUE A2L Gas Furnace (BGH96M)

What the control is telling you

The sensor detects A2L refrigerant above the alarm level. Cooling (Y) is cut and the indoor blower keeps running until the concentration drops to a safe value.

Applies to: Midea BGH96M 96% AFUE two-stage gas furnaces (060B3A, 080B3A, 080C4A, 100C5A, 100D5A, 120D5A) with A2L refrigerant leak sensor on CN30 (fan drive board LED2)

Likely causes

  • Damaged refrigerant pipe or coil
  • Refrigerant leak at fittings/brazed joints

Test and repair steps

  1. Warning: Flammable (A2L) refrigerant leak - ventilate the area and keep all open flames and ignition sources away. Do not cycle power to force the furnace to fire.
  2. Let the blower run until the alarm clears.
  3. Leak-test the coil, line set and fittings and locate the leak.
  4. Repair the leak, pressure test, evacuate and recharge per the outdoor unit instructions.
  5. Confirm LED2 stops flashing and cooling resumes.

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: Midea 96% AFUE Gas Furnace (A2L) Troubleshooting Guide, Appendix A3 Requirements for refrigerant leakage sensors, LED2 table, p.27. 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.