Honeywell RTH221 Battery replacement

Programmable Thermostat RTH221

Install two fresh AAA batteries when Lo Batt flashes on

the screen. Lo Batt appears for 60 days before the

batteries are depleted.

Replace batteries once a year, or when you will be away

for more than a month.

Most settings are stored in non-volatile (permanent)

memory. Only the clock must be set after you replace the

batteries.

Battery replacement

Set the System switch to Off before removing the batteries. Otherwise, the

heating/cooling system could remain activated even when batteries are

removed.