Battery Replacement - Honeywell YRTH7500D1009 - 5 Day Program Thermostat Operating Manual

Battery replacement

Grasp thermostat and pull to
remove from wallplate
M28103
Insert 2 fresh AA alkaline batteries
MCR28101
Batteries are optional (to provide backup power) if
your thermostat was wired to run on AC power when
installed.
Install fresh batteries immediately when the LO BATT
warning begins flashing. The warning flashes about 30
days before batteries are depleted.
Even if the warning does not appear, you should replace
batteries once a year, or before leaving home for more
than a month.
19
RTH7400/RTH7500 Series
69-2744ES—01