13
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is
blank
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed
(see page 3).
Heating
or cooling
system does
not respond
• Press
Mode
button to set system Heat (see page 7). Make
sure the desired temperature is set higher than the inside
temperature.
• Press
Mode
button to set system Cool (see page 7). Make
sure the desired temperature is set lower than the inside
temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
Temperature
settings do
not change
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)
• Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes
for the system to restart safely, without damage to the
compressor.
Aux heat runs
in cooling
• For heat pump systems, verify there is not a wire attached to
W on UWP systems. See “Wiring heat pump systems” on
page 5.
Cool runs with
a call for heat
• For heat pump systems, verify there is not a wire attached to
W on UWP systems. See “Wiring heat pump systems” on
page 5.
