Advanced Installation Guide
Troubleshooting
Troubleshooting
If you have difficulty with your thermostat, please try
the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank • Make sure fresh AA alkaline
Temperature
settings do not
change
Cannot change
system setting
to Cool
Fan does
not turn on
when heat is
required
69-2210EF—03
batteries are correctly installed
(see page 7).
Make sure heating and cooling
temperatures are set to acceptable
ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
• Check Function 1: System Type to
make sure it is set to match your
heating and cooling equipment
(see page 14).
• Check Function 3: Heating Fan
Control to make sure it is set to
match your heating equipment (see
page 16).
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