Table of Contents
Advertisement
If . . .
Display is blank.
• Check circuit breaker to be sure it is not tripped.
• Check power switch at heating and/or cooling system to be sure it is on.
• Check furnace door to be sure it is closed securely.
• If you use batteries, check that fresh AAA alkaline batteries are installed as marked on
Temperature settings
Check that the temperature settings are:
do not change.
• Heating 40°F to 90°F (4.5°C to 32°C).
• Cooling 50°F to 99° F (10°C to 37°C).
Heating system does
• Set the system to Heat by pressing the System button.
not turn on.
• Check that the heat temperature setting is set above the room temperature and "Heat
• Check the circuit breaker to be sure it is not tripped.
• Check power switch at the heating and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is closed securely.
• Wait five minutes for the heating system to respond.
• If all of this was checked, contact your local heating and cooling contractor.
Cooling system does
• Set the system to Cool by pressing the System button.
not turn on.
• Check the cool temperature setting to be sure it is set below room temperature and
• Check the circuit breaker to be sure it is not tripped.
• Check the power switch at the heating and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is closed securely.
• Wait five minutes for the cooling system to respond.
• If all of this was checked, contact your local heating and cooling contractor.
"Heat On" is not shown
Set System setting to Heat and set the temperature setting above the room temperature.
in the display.
If "Heat On" is shown solidly in the display, but the heating system does not turn on, see
"Heating system does not turn on" in Troubleshooting Tips.
"Cool On" is not shown
Set System setting to Cool and set the temperature setting below the room temperature. If
in the display.
"Cool On" is shown solidly in the display, but the cooling system does not turn on, see
"Cooling system does not turn on" in Troubleshooting Tips.
"Heat On" is flashing
Compressor minimum-off timer is active. Wait up to five minutes for the heating system
in the display (heat
to turn on.
pumps only).
"Cool On" is flashing in
Compressor minimum-off timer is active. Wait up to five minutes for the cooling system
the display.
to turn on.
Troubleshooting Tips
the battery holder.
On" shows solidly in the display.
"Cool On" shows solidly in the display.
Then . . .
5
TH5110D
69-1713—01
Advertisement
Table of Contents
