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SCREEN SAVER
Starts 45 seconds after inactivity, press any button to wake the screen NOTE: Screen saver is not
available on thermostat installations that are not connected to C wire and run on battery power only
CURRENT TIME
11:11 AM
ROOM
70
TEMPERATURE
84°
Outside
OUTDOOR
TEMPERATURE
(S84N SU ONLY
IF INSTALLED)
26
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
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
27
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