Bosch BCC50 Installation Manual And User's Manual page 20

Advanced Settings
Device Log
To access the Device Log, click Log on the Advanced Settings
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screen and enter the Professional Access Code.
The Device Log stores up to 90 days' worth of thermostat activity.
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To view historical data, select the time period you would like to view.
Then select the function you would like to view:
Functions
Adjustment shows changes to temperature set point and hold
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Operation mode shows changes to system mode, fan mode,
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and power switching
Device Alerts shows temperature warning information
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General shows changes to temperature units, date,
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and screen brightness
Other shows all other information that the thermostat stores
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