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IF YOU HAVE A PROBLEM
Table 5. Solution Guide.
Customer Assistance
Please read and follow the provided instructions for this thermostat. For additional information, go to
www.honeywell.com/yourhome or call Honeywell Customer Care, toll free, at 1-800-468-1502.
Before calling, please have the following information available:
Thermostat model number. (Located on back of thermostat).
Thermostat date code. (Located below model number).
Type of heating/cooling system (example: Gas, oil, or electric; warm air, hot water, heat pump, steam or gravity).
Location and number of wires connected to the thermostat.
If... Then…
Display does not appear. Make sure the thermostat is wired correctly. Refer to Table 2 or the
wiring diagrams.
Make sure the thermostat is mounted and latched on the wallplate.
Make sure the circuit breaker is not tripped, and reset it if necessary.
Make sure the power switch at the equipment is in the On position and
set it to On if it is in the Off position.
Temperature settings will not change
(example: cannot set the heating higher
or the cooling lower).
Make sure the temperature settings are:
40 to 90°F (4 to 32°C) for heating.
45 to 99°F (7 to 37°C) for cooling.
Heating does not come on. Set the system switch to Heat (CT8775C only).
Make sure the temperature setting is above the room temperature.
Make sure the circuit breaker is not tripped, and reset it if necessary.
Make sure the power switch at the equipment is in the On position, and
set it to On if it is in the Off position.
Wait five minutes for the system to respond.
Cooling does not come on. Set the system switch to Cool (CT8775C only).
Make sure the temperature setting is below the room temperature.
Make sure the circuit breaker is not tripped, and reset it if necessary.
Make sure the power switch at the equipment is in the On position, and
set it to On if it is in the Off position.
Wait five minutes for the system to respond.
System on indicator ( = heat, =
cool) is lit, but no warm or cool air is
coming from the registers.
Wait five minutes after seeing the flame or snowflake and check the
registers again. If there is no warm or cool air coming from the registers,
refer to Heating does not come on or Cooling does not come on. If all of this
has been checked, contact your local heating and cooling contractor.
15


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