The settings A1, A2, and A3 are the altitude settings you can program on your unit to ensure your coffee maker works properly at higher altitudes. You must choose your altitude setting for optimal performance based on the altitude of where you live:
| Altitude (m/ft) | 0 – 499 / 0 – 1637 | 500 – 999 / 1638 – 3278 | 1000 – 1499 / 3279 – 4918 |
| Parameter | A 1 | A 2 | A 3 |
