Maintenance 131
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 Control unit layout and connections
(page 96).
1. Do the steps in section Precautions before electrical work before you start the work.
2. Undo the fastening screw and remove the battery
3. Replace the battery with a new BR2032 battery.
4. Dispose of the old battery according to local disposal rules or applicable laws.
5. Set the real-time clock.
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