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SETTINGS AND ADJUSTMENTS
Set the Fan and System Switches
First set the fan switch.
Then set the system switch.
IF...
Display will not come on.
Temperature display will not go
°
°
lower than 45
F (7
C) or higher
°
°
than 88
F (31
C) during
programming.
Heating will not come on.
Cooling will not come on.
SYSTEM ON indicator is lit, but no
heat is coming from the registers.
Press key until the setting is about 10°F
(6°C) above room temperature. The cooling
equipment and fan should stop.
Move the system switch to OFF with the fan
switch remaining at AUTO. The system and
fan should be off.
AUTO: Normal setting for most homes. A
single-speed fan turns on automatically with
the air conditioner or furnace. A two-speed
fan usually runs on high with the air condi-
tioner, and on low with the furnace.
ON: The fan runs continuously. Use for im-
proved air circulation during special occa-
sions or for more efficient electronic air
cleaning.
COOL: The thermostat controls the air condi-
tioning system.
OFF: Both the heating and air conditioning
systems are off.
HEAT: The thermostat controls the heating
system.
THEN...
Set the system switch to OFF; remove batteries; insert backward for at
least five seconds to reset thermostat; replace batteries correctly. Display
should come on.
Make sure batteries are fresh and installed correctly.
The temperature setting limit has been reached. The setting range is
45°F to 88°F.
Check that switch on thermostat is set to HEAT.
Check the system fuse or circuit breaker and replace or reset if necessary.
If display is blank or displays bAt Lo, install fresh batteries.
If temperature setting is higher than current temperature, and SYSTEM
ON indicator is lit, see furnace manufacturer instructions.
Check that switch on thermostat is set to COOL.
Check the system fuse or circuit breaker and replace or reset if necessary.
If display is blank or displays bAt Lo, install fresh batteries.
The thermostat has a built-in time delay on cooling. Allow five to
ten minutes after changing the setting before the air conditioner starts.
If 2- or 4-wire installation, verify that R-Rc jumper is installed.
If temperature setting is lower than current temperature, and SYSTEM ON
indicator is lit, move system switch from COOL to OFF for ten minutes.
After ten minutes, return switch to COOL position. If air conditioner
comes on, compressor may have reached its high limit temperature
protection and shut down. If air conditioner does not come on after the
ten minutes and the SYSTEM ON indicator is lit, see air conditioner
manufacturer instructions.
Allow time for the furnace to heat up and the fan to come on before
checking for heat at the register. Check to make sure burner on-time is
set correctly according to instructions on page 2.
5
Warmer
Cool
Off
Heat
Auto
On
Auto
On
Auto
On
Cool
Off
Heat
Cool
Off
Heat
Cool
Off
Heat
Troubleshooting
69-0889
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