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STEP 12. SET THE FAN AND SYSTEM SWITCHES
IF YOU HAVE A PROBLEM
First set the fan switch. Fan On: The fan runs continuously. Use for improved air
circulation or for more efficient central air cleaning. (In a
heat-only system, fan runs continuously only if fan relay is
connected to the G thermostat terminal).
Fan Auto: Normal setting for most homes. The equipment
controls the fan operation.
Then set the system
switch.
Heat: The thermostat controls your heating system.
Off: Both the heating and air conditioning systems are off.
Cool: The thermostat controls your air conditioning system.
Table 4. Solution Guide.
If... Then…
Display does not appear. • Make sure the batteries are installed correctly.
• Make sure the thermostat is mounted and latched on the wallplate.
Mount and latch the thermostat on the wallplate if it is not.
Temperature settings will not change
(example; cannot set the heating higher
or the cooling lower).
• Make sure the temperature setpoints are:
40 to 90°F (4.5 to 32°C) for heating.
45 to 99°F (7 to 37°C) for cooling.
• Check Customize Your Thermostat section feature numbers 34 and 35.
Reset as necessary.
F
an
On Au
to
F
an
On Aut
o
S
ystem
Heat Off Co
ol
S
ystem
Heat Off Coo
l
S
ystem
Heat Off Co
ol