HVACopediaMidea · Furnace · Other
Refrigerant leak sensor response (A2L coil)
What happens, in order
- Refrigerant sensor wired to CN30 and drive board switch SW1-2 set ON
- Sensor communication lost for 2 minutes LED2 flashes green once, Y signal is cut and cooling stops
- Refrigerant above the alarm limit LED2 flashes green twice, Y is cut, cooling stops and the furnace blower keeps running until the concentration drops to a safe level
- Sensor wired but SW1-2 left OFF LED2 flashes green three times; set SW1-2 to ON
- Sensor expired or faulty LED2 flashes green four times, Y is cut and cooling stops; a new sensor is needed
Codes you may see during this
LED2 1 2 3 4 green flashes
Applies to: Midea A2L 96 percent gas furnace paired with an A2L coil
Models
More Midea furnace sequences
- Failed ignition and re-ignition · Ignition
- Low fire heat call (W1 only) · Ignition
- High fire heat call (W1 + W2) · Heating
Related
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Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Midea A2L 96 percent gas furnace troubleshooting guide, A3 Requirements for refrigerant leakage sensors. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
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.