69-2715EF—07 22
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 at heating and cooling system is on.
• Make sure furnace door is closed securely.
• Make sure C wire is connected (see page 6).
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 18).
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 18).
Cool On or Heat
On is 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 Function 2: Heat Pump Changeover Valve to make sure it is
properly configured for your system (see page 18).
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.
Heating
system is
running in cool
mode
• Check Function 1: System Type to make sure it is set to match your
heating and cooling equipment (see page 18).
Heating
and cooling
equipment are
running at the
same time
• Check Function 1: System Type to make sure it is set to match your
heating and cooling equipment (see page 18).
• Grasp and pull thermostat away from wallplate. Check to make sure bare
wires are not touching each other.
• Check thermostat wiring is correct.
Troubleshooting
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