11
In case of difficulty
If you have difficulty with your Comfort Control, please try the suggestions below.
Most problems can be corrected quickly and easily.
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.
Temperature
settings do not
change
Make sure heating and cooling temperatures are set to acceptable ranges:
• Heat: 0° to 90°F (.5° to 32°C).
• Cool: 0° to 99°F (15.5° to 3°C).
Heating system
does not respond
(“Heat On”
appears on
screen)
• Check for 2 VAC at the equipment on the secondary side of the trans-
former between power and common. If voltage is not present, check the
heating equipment to find the cause of the problem.
• Check for 2 VAC between the heat terminal (W) and the transformer
common. If 2 VAC is present, the Comfort Control is functional. Check
the heating equipment to find the cause of the problem.
• Check for loose or broken wires between the Comfort Control and the
heating equipment.
Cooling system
does not respond
(“Cool On”
appears on
screen)
• Check for 2 VAC at the equipment on the secondary side of the trans-
former between power and common. If voltage is not present, check the
cooling equipment to find the cause of the problem
• Check for 2 VAC between the cooling terminal (Y) and the transformer
common. If 2 VAC is present, the Comfort Control is functional. Check
the cooling system to find the cause of the problem.
• Check for loose or broken wires between the Comfort Control and the
cooling equipment.
Fan does not
turn on in a call
for heat
• Check Installer Setup, Function 3 (Fan Control), to make sure the fan con-
trol is properly set to match the type of system (see page ).
Heat/cool both on
at same time, or
heat does not
turn off
• Check Installer Setup, Function 1 (System Type), to make sure it is set to
match the installed heating/cooling equipment (see page ).
• Check to make sure heating and cooling wires are not shorted together.
