Replacing the Backup Battery for the Clock and Calendar Function
For the clock and calendar function, the controller uses a backup battery. The 3 V lithium backup battery is of the CR2032 type.
To replace the backup battery, do the following:
Open the front access door of the controller.
On the rear of the front access door, loosen the screws of the battery cover and remove the battery cover.
Remove the old battery and replace it with a new battery of the same type.
Reinstall the battery cover and tighten the screws on the rear of the front access door.
Close the front access door.
