Honeywell CT3300 warranty Replace the batteries, Switch Setting Result

Switch	Setting	Result
System	Cool	The thermostat controls your air conditioning system.
	Off	Both the heating and air conditioning systems are off.
	Heat	The thermostat controls your heating system.

Replace the batteries

As the batteries run low, your thermostat shows the following in the digital display:

If you see:	Batteries are:	You should:
Flashing “bAt Lo”	Low	Replace the batteries as soon as possible, within the month.
Steady “bAt Lo”	Almost dead	Replace the batteries immediately. Your heating/cooling system is not operating.
Blank display	Dead	Replace the batteries immediately. Your heating/cooling system is not operating.

a.Make sure that the System switch is set in the OFF position.

b.Open the battery door.

c.Press on the left side of the batteries to remove them.

d.Install the new batteries.

Make sure that the positive and negative terminals are oriented correctly as marked inside the battery case.

Note: If you insert the new batteries within 20–30 seconds of removing the old ones, you will not have to reprogram the thermostat. However, if the display is blank, the batteries are dead or incorrectly installed and you will have to reprogram. See page 12 to begin reprogramming.

e.Close the battery door and set the System switch to HEAT or COOL.

Note: If “bAt Lo” continues to display after replacing the batteries, set the System switch to OFF, insert the batteries backwards, wait for five to ten seconds, and return the batteries to their correct orientation. Then see page 12 to begin reprogramming.

IMPORTANT: Replace the batteries once a year to prevent the heating/cooling system from shutting down due to lack of battery power in the thermostat. If you are leaving home for longer than a month, change the batteries before leaving to prevent the system from shutting down due to lack of power.

18 OPERATION 69-0654-5