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Then set the System switch.
COOL: The thermostat controls your air
conditioning system.
OFF: Both the heating and air condition-
ing systems are off.
HEAT: The thermostat controls your
heating system.
HeatCool Off
HeatCool Off
HeatCool Off
Troubleshooting Guide
IF… THEN…
Display will not come on. ■ 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.
■ Gently clean battery contacts using a soft pencil
eraser. Do not use anything abrasive on clips.
Temperature display will not go lower ■ You have reached the temperature setting limit.
than 45
° F [7° C] or higher than 88° F ■ The setting range is 45° F to 88°F [7° C to 31°C].
[31
° C] during programming.
Temperature change occurs at the ■ Check the program times for the period in
wrong times. question. Be sure that AM and PM indications
are correct. Make sure the current day and time are
correct. Reprogram if necessary.
Heating will not come on. ■ Check that switch on thermostat is set to HEAT.
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