Carrier NON-PROGRAMMABLE DIGITALTHERMOSTAT Owner's Manual page 12

About Advanced Features & Operation
ELECTRIC HEAT - Selecting Electric Heat on, page 7,
step 6, will cause the thermostat to turn on the fan
immediately
gas furnaces
unless the heater
KEYPAD LOCK - T o prevent unauthorized use of the thermostat,
the front panel buttons may be disabled. To disable, or
'lock' the keypad, press and hold in the Mode button.
While holding the Mode button in, press the Up and Down
buttons in together.
Press all 3 for
Keypad Lockout
To unlock the buttons, again press and hold the Mode
button. While holding the Mode button in, press the Up
and Down buttons in together.
any time there is a heat demand. Since all
control the fan, this feature should be off
is only electric.
MODE
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AUTO
C
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H
72
OOL
EAT