69-2738EFS—03
10
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 at heating and cooling system is on.
• Make sure furnace door is closed securely.
• Make sure C wire is connected.
Fan does
not turn on
when heat is
required
• Check Function 3: Heating Fan Control to make sure it is set to match the
heating equipment.
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.
Heating system
is running in
cool mode
• Check Function 1: System Type to make sure it is set to match the heating
and cooling equipment.
Heating
and cooling
equipment are
running at the
same time
• Check Function 1: System Type to make sure it is set to match the heating
and cooling equipment.
• Grasp and pull thermostat away from wallplate. Check to make sure bare
wires are not touching each other.
• Check thermostat wiring is correct.
