HVACopediaMidea · Furnace · Ignition
Low fire heat call (W1 only)
What happens, in order
- W1 calls; inducer starts on high speed and the low pressure switch closes
- Inducer drops to low speed and the igniter energizes for preheat
- Gas valve opens and the burners light; igniter turns off 3 s later
- Blower motor starts after a 30 s delay
- System runs on low fire
- Call ends and flame is gone post-purge starts
- Fan delay clears remaining heat; time set by dip switches S1-3 and S1-4
Timings and thresholds
| Item | Value |
|---|---|
| Inducer high speed / switch proving | 15 s |
| Igniter preheat | 17 s |
| Igniter off after valve opens | 3 s |
| Blower on delay | 30 s |
| Post-purge | 15 s |
| Heat fan off delay (default) | 180 s |
Codes you may see during this
E1 E2 E3 E4 E5 E6 E7 E8 FL Pr
Applies to: Midea A2L 96 percent gas furnace
Models
More Midea furnace sequences
- Failed ignition and re-ignition · Ignition
- High fire heat call (W1 + W2) · Heating
- Refrigerant leak sensor response (A2L coil) · Other
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, Appendix A1.1. 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.