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Honeywell Thermostat RTH5160 Manual


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Battery Replacement

Batteries are required to provide power. Install fresh batteries immediately when the low battery icon appears. The icon appears about two months before the batteries are depleted.

Even if the low battery icon does not appear, you should replace batteries once a year, or before leaving home for more than a month.

Battery low icon

If batteries are inserted within two minutes, the time and day will not have to be reset. All other settings are permanently stored in memory, and do not require battery power.

NOTE: When replacing batteries, alkaline batteries are recommended.

Alerts Screen

  • You will see the alert icon  and the alert number on the screen.

Alerts screen

  • Press Next (+) to see additional alerts, if any. Then press Done to go back to the home screen.

Alerts screen next

NOTE: If the alert is a critical alert, you may not be able to access the home screen and should call a HVAC professional.

Alerts Codes

Alerts code table


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