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Maintenance 147
Control unit battery
Replace the real-time clock battery if the BATT OK LED is not illuminated when the control
unit is powered. For information on the LED, see
Layout and connections
on page 234.
1. Undo the fastening screw and remove the battery
2. Replace the battery with a new BR2032 battery.
3. Dispose the old battery according to local disposal rules or applicable laws.
4. Set the real-time clock.
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