Replace battery as soon as the low battery icon appears on the LCD display.

Note: Low battery icon will remain on display until the next operation (manual or automatic).

Release the four screws of the battery compartment cover. Gently remove the cover, seal and screws. Replace the battery with a new one. Use only high quality Alkaline battery. Put the battery, seal and cover in place. Re-tighten the four screws.

Note: Backup batteries keep the program safe.