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18
Quick Installation Guide
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 properly installed (see
page 6).
If powered by common (C-wire), verify circuit breaker and furnace
switch are turned on.
Verify furnace door is securely closed.
Cannot change
system setting to Cool
Check System Setup Option 220 to make sure the options are set to
either 1 or 2 (see page 9).
Fan does not turn on
when heat is required
Check System Setup Option 205 to make sure it is set to match your
heating equipment (see page 9).
Heating system is
running in cool mode
Check System Setup Option 200 or 218 to make sure it is set to
match your heating and cooling equipment (see page 9).
Heating or cooling
system does not
respond
Press System to set system to Heat. Make sure the temperature is
set higher than the Inside temperature.
Press System to set system to Cool. Make sure the temperature is set
lower than the Inside temperature.
Check circuit breaker and reset if necessary.
Make sure power switch at heating & cooling system is on.
Make sure furnace door is closed securely.
Wait 5 minutes for the system to respond.
Heat On / Cool On
flashing on the screen
Compressor protection feature is engaged. Wait 5 minutes for the
system to restart safely, without damage to the compressor.
Heat pump issues cool
air in heat mode, or
warm air in cool mode
Check System Setup Option 200 or 218 to make sure it is set to
match your heating and cooling equipment (see page 9).
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” on page 15.
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” on page 15.
Troubleshooting
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