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Midea · Furnace

LED2 green 4 flashes Refrigerant sensor expired or faulty

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

What the control is telling you

The refrigerant sensor has reached end of life or is faulty. The Y signal is turned off and cooling stops.

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

  • Sensor end of service life
  • Sensor failure

Test and repair steps

  1. Confirm the sensor cable and CN30 connection are good.
  2. Order and install a new refrigerant detection sensor from the distributor.
  3. Confirm SW1-2 is ON and cooling resumes.

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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.