Battery Replacement - Honeywell RTH1100 Series Operating Manual

Table of contents

Battery replacement

Set the System switch to Off before removing the batteries.
Install two fresh AA batteries when the low-battery icon begins
flashing. The icon appears when the thermostat has detected that
the batteries are low.
Replace batteries once a year or before leaving home for more than
a month.
The settings are stored in permanent memory and are saved even
when batteries are removed.
9
RTH1100
M32071
M32072
69-2447ES—03