Honeywell RTH6400 Owner's Manual - Page 24

Troubleshooting - problems

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SETUP WIRING Advanced Installation Guide 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 Make sure heating and cooling settings do not temperatures are set to acceptable change ranges: • Heat: 40° to 90°F (4.5° to 32°C). • Cool: 50° to 99°F (10° to 37°C). Cannot change • Check Function 1: System Type to system setting make sure it is set to match your to Cool heating and cooling equipment (see page 14). 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 16). ASSISTANCE TROUBLESHOOTING 69-2210EF-03 22

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Advanced Installation Guide
69-2210EF—03
22
Troubleshooting
SETUP
WIRING
ASSISTANCE
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
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 14).
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 16).