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Troubleshooting
If you are facing difficulties with your thermostat, please try the following suggestions. Most
problems can be corrected easily through these.
Display is blank • Check circuit breaker and reset if necessary.
• Make sure power switch at heating and cooling system is on.
• Make sure furnace door is closed securely.
• Make sure C wire is connected.
Cannot change
system setting to
Cool
• Check at the System Setup screen “Your thermostat controls” or “Your system type” is set to
match your heating and cooling equipment.
Fan does not turn
on when heat is
required
• Check that System Setup screen “Your fan control” is set to match your heating equipment.
“Wait” appears on
the screen
• Compressor protection feature is engaged. Wait for 5 minutes for the system to restart
safely, without causing damage to the compressor.
Heat pump issues
cool air in heat
mode, or warm air in
cool mode
• Check your setting for System Setup screen “Type of changeover valve” to make sure it is
properly configured for your system (see page 66).
Heating or cooling
system does not
respond
• Touch SYSTEM to set system to Heat. Make sure the temperature is set higher than the
room temperature.
• Touch 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 and cooling system is on.
• Make sure furnace door is closed securely.
• If “Wait” is displayed, the compressor protection timer is on. Wait for 5 minutes for the
system to restart safely, without damaging the compressor.
Heating system
is running in cool
mode
• Check that on the System Setup screen “Your thermostat controls” or “Your system type” is
set to match your heating and cooling equipment .
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