69-1713 21
Cooling 
system does 
not turn on.
• Set the system to Cool by pressing the 
System button.
• Check the cool temperature setting to be 
sure it is set below room temperature 
and “Cool On” shows solidly in the 
display.
• Check the circuit breaker to be sure it is 
not tripped.
• Check the power switch at the heating 
and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is 
closed securely.
• Wait five minutes for the cooling system 
to respond.
• If all of this was checked, contact your 
local heating and cooling contractor.
“Heat On” is 
not shown in 
the display.
Set System setting to Heat and set the 
temperature setting above the room 
temperature. If “Heat On” is shown solidly 
in the display, but the heating system does 
not turn on, see “Heating system does not 
turn on” in Troubleshooting Tips.
Troubleshooting Tips (Cont)
If . . . Then . . .
69-1713.fm  Page 21  Tuesday, June 8, 2004  10:33 AM