Peco T190 Owner's Manual page 11

Filter and System Usage Indicators
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USAgE – this icon lights up when system usage has reached the interval time set by the user.
The thermostat's system usage function counts the number of hours heating or cooling is on.
FILTER USAgE – this icon lights up when filter usage has reached the interval time set by the
user. The thermostat's filter usage function counts the number of hours the fan is on.
Low Battery Indicator
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The battery symbol is displayed when the thermostat's battery voltage is low. The symbol remains
lit until the user puts in new batteries.
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