Honeywell RTHL3550 Thermostat User Manual


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Advanced Installation Guide
69-2584ES—01 26
Troubleshooting
SETUPWIRINGASSISTANCETROUBLESHOOTING
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
batteries are correctly installed
(see page 7).
Temperature
settings do not
change
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).
Cannot change
system setting
to Cool
• CheckFunction 1: System Type to
make sure it is set to match your
heating and cooling equipment
(see page 13).
Fan does not
turn on when
heat is
required
• CheckFunction 3: Heating Fan
Control to make sure it is set to
match your heating equipment (see
page 15).
Heating and
cooling
equipment
running at the
same time (or
heat does not
turn off)
• CheckFunction 1: System Type to
make sure it is set to match your
heating and cooling equipment
(see page 13).
• Grasp and pull thermostat away
from wallplate. Check to make sure
bare wires are not touching each
other (see page 6).
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