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69-1410—2 G.H. 12-02 www.honeywell.com/yourhome
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
a
Select models.
Cooling does not
come on.
No power to the thermostat. • Check that C terminal is connected to the system transformer.
• Check for 24 Vac between R and W terminals.
—If missing 24 Vac:
— check if the circuit breaker is tripped—reset the circuit
breaker.
— check if the system fuse is blown—replace the fuse.
— check if the power switch on the HVAC equipment is in
the Off position—set to the On position.
— check wiring between thermostat and HVAC equipment—
replace any broken wires and tighten any loose connec-
tions.
—If 24 Vac is present, proceed with troubleshooting.
Thermostat minimum off
time is activated.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off time (if
required).
System selection is not set
to Cool.
Set system selection to Cool.
Cool setpoint is above
room temperature.
Check cooling setpoint. Set cooling setpoint to desired temperature.
System on
indicator
(flame=heat,
snowflake=cool)
is displayed, but
no warm or cool
air is coming from
the registers.
Fan operation set for 0
(conventional heat) when it
should be set for 1 (electric
heat).
Enter Installer Setup number 2 and reconfigure the fan operation.
Conventional heating
equipment turns on the fan
when the furnace has
warmed up to a setpoint.
Wait a minute after seeing the on indicator and then check the
registers.
Heating or cooling
equipment is not operating
Verify operation of heating or cooling equipment in self-test.
Outdoor
temperature not
displayed.
a
Option not activated. Enter Installer Setup number 24 and set to 1.Thermostat must have
OT terminals and a C7089B1000 installed.
Outdoor
temperature
display is
incorrect.
a
Outdoor temperature
sensor is connected
incorrectly.
Refer to C7089B1000 Outdoor Temperature Sensor Installation
Instructions and check wiring between the thermostat and sensor.
Wrong sensor. Replace sensor with C7089B1000 Sensor.
Table 6. Troubleshooting Guide.
Symptom Possible Cause Action