In Case Of Difficulty - Honeywell RTH5100B Installation Manual

Installation Guide

In case of difficulty

If you have difficulty with your thermostat, please try the following
suggestions. Most problems can be corrected quickly and easily.
Display is blank
Temperature
settings do not
change
Cannot change
system setting
to Cool
Fan does not
turn on when
heat is required
• Make sure fresh AAA alkaline batteries are correctly
installed (see page 14).
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 17).
• Check Function 3: Heating Fan Control to make sure it
is set to match your heating equipment (see page 19).