T8601D Chronotherm® IV Deluxe
Programmable Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The T8601 Chronotherm® IV Deluxe Programmable
Thermostat provides electronic control of 24 Vac single-
Table 1. Description of T8601 Thermostats.
T8601 System Changeover System Selection Fan Selection Comments
D Heat-Cool Automatic Heat-Off-Cool-Auto On-Auto Use keyboard for system and fan selections
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old thermostat.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause
a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
stage heating and cooling systems. Refer to Table 1 for a
general description of the thermostat. All T8601
thermostats require a common wire to supply power.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • •All Rights Reserved
69-1410-2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
NO
NO
[1.5 METERS]
Fig. 1. Typical location of thermostat.
Wallplate Installation
The thermostat can be mounted horizontally on the wall
or on a 2 in. x 4 in. wiring box. Position wallplate
horizontally on the wall or on a 2 in. x 4 in. wiring box.
1. Position and level the wallplate (for appearance
only). The thermostat functions correctly even
when not level.
WIRES
THROUGH WALL
WALL
ANCHORS (2)
Fig. 2. Mounting the wallplate.
2. Use a pencil to mark the mounting holes. See
Fig. 2.
WALL
MOUNTING
HOLES
MOUNTING
SCREWS
M15044
YES
5 FEET
NO
M10106
3. Remove the wallplate from the wall and drill two
3/16 in. holes in the wall (if drywall) as marked. For
firmer material such as plaster, drill two 7/32 in.
holes. Gently tap anchors (provided) into the drilled
holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening.
5. Loosely insert the mounting screws into the holes.
6. Tighten mounting screws.
WIRING
All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 through 5 for typical hookups.
A letter code is located near each terminal for
identification.
CAUTION
Electrical Hazard.
Can cause electric shock and equipment
damage.
Disconnect power before beginning wiring.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 6.
THERMOSTAT
GC
FAN
RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
Fig. 3. Typical hookup in heat only application.
HEAT
RELAY
RW
TRANSFORMER
L1
(HOT)
L2
1
M10357
69-1410—2 2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
THERMOSTAT
C
YG
COMPRESSOR
CONTACTOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
2
PUMP SYSTEMS.
3
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
Fig. 4. Typical hookup in heat and cool
THERMOSTAT
RC
YG
2
COMPRESSOR
CONTACTOR
1
L1
(HOT)
L2
COOLING TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A
2
ONE TRANSFORMER SYSTEM.
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
4
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
Fig. 5. Typical hookup in heat and cool
O
FAN
RELAY
COOL
DAMPER
B
2
HEAT
DAMPER
HEAT
RELAY
2
RW
TRANSFORMER
system with one transformer.
O
BC
3
HEAT
DAMPER
HEAT
RELAY
HEATING TRANSFORMER
COOL
DAMPER
FAN
RELAY
3
system with two transformers.
RW
OTOT
3
OUTDOOR
TEMPERATURE
SENSOR
L1
(HOT)
L2
4
OUTDOOR
TEMPERATURE
SENSOR
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).
Fig. 6. Proper wiring technique.
Mounting Thermostat
1
M10353
OTOT
L1
(HOT)
L2
M10354
1. Engage tabs at the top of the thermostat and wallplate. See Fig. 7.
2. Press lower edge of case to close and latch.
NOTES: To remove the thermostat from the wall, first pull
out at the bottom of the thermostat; remove top
last.
A.
ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.
1
B.
PRESS LOWER
EDGE OF CASE
TO LATCH.
Fig. 7. Mounting thermostat on wallplate.
M4826
M14628
3 69-1410—2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
A
Using Thermostat Keys
The thermostat keys are used to:
• set current day and time,
• program times and setpoints for heating and cooling,
• temporarily override program temperatures,
• display present setting,
INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
ND SYSTEM TEST
SET CURRENT
DAY AND TIME
RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
SET WAKE TIMES
AND SETPOINTS
Set Current
Run
Day/Time
Program
Hold Temp
Day
Daylight
Time
COPY ONE PROGRAMMED
DAY TO ANOTHER DAY
SET LEAVE TIMES
AND SETPOINTS
Time Set Program
Heat/Cool
Copy
Fig. 8. T8601D key locations and descriptions.
SETTINGS
System and Fan Settings
The System default setting is Heat and the Fan default
setting is Auto. Use the System and Fan keys to change
the settings. See Fig. 9. The fan settings can be set for
each program period individually. The system selection is
for all the program periods.
System settings control the thermostat operation as
follows:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
• configure Installer Setup,
• check Self-Test,
• display outdoor temperature (select models),
• set the system operation,
• set the fan operation.
See Fig. 8 for the location of the keys.
SET RETURN TIMES
AND SETPOINTS
Leave
Wake
Settings
DECREASE TIME SETTING OR
SCROLL BACKWARD THROUGH
INSTALLER SETUP AND SYSTEM TEST
Return Sleep
System Fan
Run
Set Current
Program
Hold Temp
Day
Day/Time
Daylight
Time
Time Set Program
Copy
INCREASE TEMPERATURE
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS
DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTIONS
DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE
SET SLEEP TIMES
AND SETPOINTS
SELECT FAN
OPERATION
SELECT SYSTEM
OPERATION
CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
Leave
Wake
Return
Heat/Cool
System Fan
Settings
Sleep
M14625
Fig. 9. Thermostat System and Fan key locations.
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen
or pencil point can damage the keyboard.
M14624
System
Fan
69-1410—2 4
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Outdoor
Fan
eat
On
o
Off
Cool
o
Temperature Settings
Refer to Table 2 for the default program. If the daytime
energy savings period is not used, press the period key
(Leave or Return) until the time is blank. The fan setting
feature is available on select thermostat models. See
Owner’s Guide, form number 69-0940, for complete
instructions on changing the program.
Table 2. Default Program Settings.
Period Time Heat Setpoint
Wake 6:00 AM 70°F (21°C) 78°F
Leave 8:00 AM 62°F (16.5°C) 85°F
Return 6:00 PM 70°F (21°C) 78°F
Cool
Setpoint
(25.5°F)
(29.5°F)
(25.5°F)
Fan
Setting
Auto
Auto
Auto
Sleep 10:00 PM 62°F (16.5°C) 82°F (28°F) Auto
INSTALLER SETUP
NOTE: For most applications, the thermostat factory-
settings do not require changing. Review the
factory settings in Table 2 and, if no changes
are necessary, go to the Installer Self-Test
section.
The Installer Setup is used to customize the thermostat
to specific systems. Some of the options include
temperature display, system changeover and outdoor
temperature display. Installer Setup numbers are listed in
Table 3. The table includes all the configuration options
and the factory-settings for the T8601.
A combination of key presses are required to use the
Installer Setup feature:
— To enter the installer setup, press and hold the
information i key with the increase ! and
decrease " keys until the first number is displayed.
All display segments appear for approximately three
seconds before the number is displayed. See Fig. 10
and 11.
— To advance to the next Installer Setup, press the
Time ∆ key.
— To change a setting, use the increase ! or
decrease " key.
— To scroll the Installer Setup numbers backward, press
the Time ∇ key.
— To exit the Installer Setup, press Run Program.
Wait
Recovery
Hold for
Filter
Em Ht
Tue Wed Thu Fri Sat Sun
Mon
Wake Leave Return Sleep
Set Day/TimeSet Program
Aux Ht
Days
AM
PM
Temporary Setting
Room
Repl Batt
DST
Heat
Fig. 10. Display of all LCD segments.
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)
Fig. 11. Display of Installer Setup
number and setting.
FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
CAUTION
Electric Heat System Configuration Hazard.
Can cause equipment damage.
Configure electric heat system to 1 in Installer
Setup number 2 to prevent system running
without the fan.
IMPORTANT
Only configurable numbers are shown on the
device. Example: If thermostat does not have a
system key, Installer Setup Number 12 is not
displayed. Review Table 3 factory settings and
mark any desired changes in the Actual
Settings column. When Installer Setup is
complete, review the settings to confirm that
they match the system.
Cool
Em H
Aut
Aut
M14559
M14618
5 69-1410—2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options.
Select
Installer Setup
Number
(Press Time !
key to change)
Factory-Setting
Other Choices
(Press ! or " key to change)
Actual
SettingDisplay Description Display Description
Not used 1 — — — — —
Fan operation
a
2 0 Conventional application
where equipment control
fan operation in heat mode
1 Heat pump or electric
heat applications where
thermostat controls fan
operation in heat mode
Not used 3 — — — — —
Heating cycle
rate
4 6 6—6 cph used for
conventional heat.
1, 3 or 9 1—1 cph used for radiant
floor heat, gravity
system
3—3 cph used for hot
water systems or high
efficiency furnaces
9—9 cph used for electric
heat systems
Not used 5 thru 11 — — — — —
System setting
adjustment
Adaptive
Intelligent
Recovery™
control
Degree
temperature
display
12 1 Manual changeover. 0 or 2 0—Auto changeover
13 0 Adaptive Intelligent
14 0 Temperature is displayed
Recovery™ control is
activated (system starts
early so setpoint is reached
by start of program period)
in °F
2—Auto only
1 Conventional recovery
(system starts recovery at
programmed time)
1 Temperature is displayed
in °C
Not used 15 — — — — —
Clock format 16 0 12-hour clock format 1 24-hour clock format
Not used 17 and 18 — — — — —
Extended fan
operation in
a
heating
Extended fan
operation in
a
cooling
19 0 No extended fan operation
20 0 No extended fan operation
after the call for heat ends
after the call for cool ends
1 Fan operation is
extended 90 seconds
after the call for heat
ends
1 Fan operation is
extended 90 seconds
after the call for cool ends
Not used 21 thru 23 — — — — —
Outdoor
temperature
display (select
models)
24 0 No outdoor temperature is
displayed
1 Outdoor temperature is
displayed. Needs a
C7089B1000 Outdoor
Sensor to operate
Not used 25 thru 29 — — — — —
Deadband 30 3 Heating and cooling
setpoints can be set no
closer than 3°F (1.5°C)
4 thru 10 Heating and cooling
setpoints can be set no
closer that chosen value:
4—4°F (2°C)
5—5°F (2.5°C)
6—6°F (3°C)
7—7°F (3.5°C)
8—8°F (4°C)
9—9°F (4.5°C)
10—10°F (5°C)
Not used 31 and 32 — — — — —
Minimum off
time for the
compressor
33 5 5 minute minimum off- time
for the compressor.
0 thru 4 Minimum number of
minutes (0 thru 5) the
compressor is off
between calls for the
compressor
69-1410—2 6
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options.
Select
Temperature
range stops in
heating
Temperature
range stops in
cooling
Installer Setup
Number
(Press Time !
key to change)
34 90 Highest heating setpoint
35 45 Lowest cooling setpoint
Factory-Setting
setting.
setting.
Other Choices
(Press ! or " key to change)
40 to 89 Temperature range (1°F
increments) of heating
setpoint settings.
46 to 99 Temperature range (1°F
increments) of cooling
setpoint settings.
Actual
SettingDisplay Description Display Description
Not used 36 — — — — —
Temperature
display
adjustment
Furnace air
filter timer
Humidifier pad
monitor
Ultraviolet (UV)
air treatment
system lamp
monitor
a
Number 2 must be set to 1 to extend fan operation.
37 0 No difference in displayed
temperature and actual
room temperature
43 2 30 days (System run time) 0, 1, 3, 4 0—off
44 0 Off 1, 2, 3 1—90 days
45 0 Off 1 1—365 days
IMPORTANT
3 thru -3 1—Display adjusts to 1°F
Review the settings to confirm that they match
the system. Press Run Program to exit the
Installer Setup. The thermostat has saved the
Installer Setup changes and initiated a reset in
order to operate using the new settings. Be sure
to set the current day and time immediately.
higher than actual
room temperature
2—Display adjusts to 2°F
higher than actual
room temperature
3—Display adjusts to 3°F
higher than actual
room temperature
-1—Display adjusts to
1°F lower than actual
room temperature
-2—Display adjusts to
2°F lower than actual
room temperature
-3—Display adjusts to
3°F lower than actual
room temperature
1—10 days
3—60 days
4—120 days
(Time is counted when
heat, cool or fan is
running)
2—189 days
3—365 days
(Time is counted by
calendar days in any
mode.)
7 69-1410—2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Setting Current Day and Time
1. Press Set Current Day/Time.
NOTES: On initial power up or after an extended power
loss, 1:00 pm flashes on the display until a key
is pressed.
Set Day/Time
Day/Time
Program
Heat/Cool
Hold Temp
System Fan
Day
Settings
Daylight
Copy
Time
Set Current
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
2. Press Day until the current day is displayed.
NOTES: Sun=Sunday, Mon=Monday, Tue=Tuesday,
Wed=Wednesday, Thu=Thursday, Fri=Friday,
Sat=Saturday.
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Day
3. Press Time ∆ or Time ∇ until the current time is
NOTES: Tapping the Set Current Day/Time changes the
NOTES: If the current time is Daylight Savings Time,
Daylight
Program
Heat/Cool
Hold Temp
System Fan
Day
Settings
Daylight
Copy
Time
displayed.
time in one-hour increments.
Time
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Program
Heat/Cool
Hold Temp
System Fan
Day
Settings
Daylight
Copy
Time
press Daylight Time until DST is displayed.
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Program
Heat/Cool
Time
Hold Temp
System Fan
Day
Settings
Daylight
Copy
Time
PM
Mon
M14619
Set Day/Time
PM
Tue
M14620
Set Day/Time
AM
Tue
M14621
Set Day/Time
AM
Tue
DST
M14622
4. Press Run Program.
Run
Program
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Program
Heat/Cool
Hold Temp
System Fan
Day
Settings
Daylight
Copy
Time
Wake
AM
Tue
Room
DST
M14623
Viewing or Resetting Timer Settings
When the thermostat activates a timer, the thermostat
flashes Filter until the timer resets.
1. Reset the timer by pressing the i key until the
expired timer is displayed.
Filter
2. Press the Time ∆ key to reset the timer.
Filter
3. Press the Run Program key.
NOTE: You can view the number of days remaining at
any time by pressing the i key three or four
times. If more than one timer is active, all active
timers show sequentially when pressing the
i key several times.
Days
M20243
Days
M20244
System
Heat
Fan
Auto
69-1410—2 8
INSTALLER SELF-TEST
Outdoor
Fan
eat
On
o
Off
Cool
o
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Use the Installer Self-Test to check the thermostat operation. Refer to Table 4 for a list of the available self-tests.
CAUTION
Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during Installer System Test.
Avoid cycling compressor quickly.
To start the self-test:
Press and hold the increase ! and decrease " keys at
the same time until 10 appears. All segments of the
display are displayed before the 10 appears. See Fig. 12
and 13.
Table 4. Tests Available In The Installer Self-Test.
Tes t
Number System Test Description
10-19 Heating equipment can be turned on and off
30-39 Cooling equipment can be turned on and off
40-49 Fan equipment can be turned on and off
60 0 to
Keyboard keys test
60 19
70-79 Thermostat information including date code
and software versions are displayed
Wait
Recovery
Hold for
Filter
Tue Wed Thu Fri Sat Sun
Mon
Wake Leave Return Sleep
Em Ht
Set Day/TimeSet Program
Aux Ht
Fig. 12. Display of all LCD segments.
Days
AM
PM
Temporary Setting
Repl Batt
DST
Room
Heat
Cool
Em H
Aut
Aut
M14559
Refer to Table 5 for the directions and results of the
specific tests.
NOTE: Press Time ∆ to advance to the next test and
Time ∇ to go back to the previous test. Press
Run Program to exit the self-test.
Table 5. Installer Self-Test Options.
Key to
Press
Tes t
Number Description
Heating Equipment System Test
Time ∆ 10 Enter heating equipment system test
! 11 Heat comes on. When Installer Setup
number 2 is 1, the system fan is also
energized
" 10 Heat and system fan turn off
Cooling Equipment System Test
Time ∆ 30 Change from heating to cooling
equipment system test
! 31 Cool and system fan come on
" 30 Cool and system fan turn off
Fan Equipment System Test
Time ∆ 40 Change from cooling to fan
equipment system test
! 41 Fan comes on
" 40 Fan turns off
Key Equipment System Test
Time ∆ 60 Change from fan to key operation
NOTE: Press any key and the displayed numbers
change. Press Time ∇ to go to the previous test
and Time ∆ to go to the next test. The Run
Program key does not exit this test. Press
Time ∇or Time ∆ and then the Run Program key
to exit.
system test
M14612
Fig. 13. Display of test number.
9 69-1410—2
T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
THERMOSTAT INFORMATION
1. Press the Time ∆ to access the thermostat
information.
M14613
2. Press the increase ! key to display the production
date code. The first two large digits are the month
and the third digit is the last digit of the year.
(Example: 027=February 1997).
3. Press the increase ! key again to display the
software identification code. (Example: 02 =
software ID code 2).
M14614
M14615
4. Press the increase ! key again to display the
software revision number. (Example: 001=
Revision number 1).
M14616
5. Press the increase ! key again to display the
EEPROM identification code. (Example: 314 =
EEPROM ID 314).
M14617
6. Press the Run Program key to exit the self-test.
The self-test times out after four minutes without
any key presses.
CHECKOUT
Outdoor Temperature Sensor (Select models)
Allow the outdoor temperature sensor to absorb the
outdoor air for a minimum of five minutes before taking a
69-1410—2 10
TROUBLESHOOTING GUIDE
Refer to Table 6 for troubleshooting information.
Table 6. Troubleshooting Guide.
Symptom Possible Cause Action
Display does not
come on.
Temperature
display is
incorrect.
Temperature
settings do not
change.
(Example: Cannot
set the heating
higher or the
cooling lower.)
Heating does
come on.
Thermostat is not being
powered
Room temperature display
has been reconfigured.
Thermostat is configured
for °F or °C display.
Bad thermostat location. Relocate the thermostat.
The upper or lower
temperature limits were
reached.
The setpoint temperature
range stops were
configured.
No power to the thermostat. • Check that C terminal is connected to the system transformer.
Thermostat minimum off
time is activated.
System selection is not set
to Heat.
Heating setpoint is below
room temperature.
• Check that C terminal is connected to the system transformer.
• Check for 24 Vac between R and C 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.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (4.5 to 32°C)
• Cooling limits are 48 to 99°F (7 to 35°C
Check Installer Setup numbers 34 and 35 and reconfigure the setpoint
stops.
• 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.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired temperature.
11 69-1410—2
Table 6. Troubleshooting Guide.
Symptom Possible Cause Action
Cooling does not
come on.
System on
indicator
(flame=heat,
snowflake=cool)
is displayed, but
no warm or cool
air is coming from
the registers.
Outdoor
temperature not
displayed.
Outdoor
temperature
display is
incorrect.
a
Select models.
No power to the thermostat. • Check that C terminal is connected to the system transformer.
Thermostat minimum off
time is activated.
System selection is not set
to Cool.
Cool setpoint is above
room temperature.
Fan operation set for 0
(conventional heat) when it
should be set for 1 (electric
heat).
Conventional heating
equipment turns on the fan
when the furnace has
warmed up to a setpoint.
Heating or cooling
equipment is not operating
Option not activated. Enter Installer Setup number 24 and set to 1.Thermostat must have
a
Outdoor temperature
sensor is connected
incorrectly.
a
Wrong sensor. Replace sensor with C7089B1000 Sensor.
• 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.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off time (if
required).
Set system selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired temperature.
Enter Installer Setup number 2 and reconfigure the fan operation.
Wait a minute after seeing the on indicator and then check the
registers.
Verify operation of heating or cooling equipment in self-test.
OT terminals and a C7089B1000 installed.
Refer to C7089B1000 Outdoor Temperature Sensor Installation
Instructions and check wiring between the thermostat and sensor.
Automation and Control Solutions
Honeywell Honeywell Limited-Ho neywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
69-1410—2 G.H. 12-02 www.honeywell.com/yourhome
M1V 4Z9
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