Irritrol MC-Plus: Can't Set On/Off Days – Calendar Length Wrong

Error "Err" when setting water days; only day #1 (Sunday) changeable.

Fix

1. Turn dial to "Calendar/Program Erase".
2. Display shows "PE:1" (1-day calendar).
3. Enter "7" and press Enter → "PE:7" (7-day calendar).
4. Now set on/off days normally.

If still errors, circuit board faulty.