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TROUBLESHOOTING
DISPLAY IS BLANK
• Check circuit breaker and reset if
necessary
• Make sure power switch at heating &
cooling system is on
• Make sure furnace door is closed securely
HEATING SYSTEM DOES NOT RESPOND
("HEATING" APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the
secondary side of the transformer between
power and common If voltage is not
present, check the heating equipment to
find the cause of the problem.
• Check for 24VAC between the heat terminal
(W) and the transformer common If 24VAC
is present, the thermostat is functional
Check the heating equipment to find the
cause of the problem
• Check for loose or broken wires between
the thermostat and the heating equipment
42
TEMPERATURE SETTINGS DO NOT CHANGE
• Make sure heating and cooling
temperatures are set to acceptable ranges:
− Heat: 40° to 90°F (4° to 32°C)
− Cool: 50° to 99°F (10° to 37°C)
COOLING SYSTEM DOES NOT RESPOND
("COOLING" APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the
secondary side of the transformer between
power and common If voltage is not
present, check the cooling equipment to
find the cause of the problem
• Check for 24VAC between the cooling
terminal (Y) and the transformer common
If 24VAC is present, the thermostat is
functional Check the cooling system to
find the cause of the problem.
• Check for loose or broken wires between
the thermostat and the cooling equipment
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check System Setting (Fan Control in
Heating), to make sure the fan control is
properly set to match the type of system
(see page 19)
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check System Setting (O/B Operation) to
make sure the reversing valve operation
matches the heat pump
HEAT/COOL BOTH ON AT SAME TIME
• Check System Setting (Equipment Type), to
make sure it is set to match the installed
heating/cooling equipment (see page 19)
• Check to make sure heating and cooling
wires are not shorted together
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check System Setting (Equipment Type), to
make sure it is set to match the installed
heating/cooling equipment (see page 19)
"HEATING" IS NOT DISPLAYED
• Check System Setting (Control Setup) is set
correctly
• Change the System Mode to Heat, and set
the temperature level above the current
room temperature
"COOLING" IS NOT DISPLAYED
• Check System Setting (Control Setup) is set
correctly
• Change the System Mode to Cool, and set
the temperature level below the current
room temperature
HUMIDIFIER DOES NOT OPERATE IN AUTO MODE
• Check Installer System Setting number
(Outdoor Sensor) is set to Yes
• Verify that the outdoor sensor is functioning
correctly If the sensor is functioning
correctly the outdoor temperature will
display in the outdoor temperature
location (see SCREEN SAVER on page 42 for
the location)
43
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