Maintenance 21
4
Maintenance
Contents of this chapter
This chapter gives instructions on how to do maintenance on the control unit.
Replacing the real-time clock battery
Replace the real-time clock battery if the
BATT OK
LED is off when the control unit is
powered. For information on the LED, see section
. For the replacement
battery type, see
.
See
A
in figure
Replacement illustration (page 23)
1. Remove the screw and the clip covering the battery.
2. Remove the battery.
3. Insert a new battery. Refer to the illustration.
4. Install the screw and the clip.
5. Set the real-time clock.
6. Discard the old battery. Obey local disposal rules and applicable laws.
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