Honeywell Chronotherm Iv T8600D Users Manual 69 1409 Chronotherm® Deluxe Programmable Thermostats

2015-01-23

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T8600D Chronotherm® IV
Deluxe Programmable Thermostats
INSTALLATION INSTRUCTIONS

APPLICATION
The T8600 Chronotherm® IV Deluxe Programmable
Thermostat provides electronic control of 24 Vac singlestage heating and cooling systems.

Refer to Table 1 for a general description of the
thermostat. All T8600 thermostats are powered by either
heating or cooling system.

Table 1. Description of T8600 Thermostats
T8600

System

Changeover

Heat-Cool

Automatic

System
Selection

Fan
Selection

Heat-Off-CoolAuto

On-Auto

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. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old control.

When Installing this Product...
2.

Read these instructions carefully. Failure to follow
the instructions can damage the product or cause
a hazardous condition.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.

® U.S. Registered Trademark
Copyright © 2002 Honeywell •

System and fan
selections are done by
keyboard.

Installer must be a trained, experienced service
technician.
After completing installation, use these instructions
to check out the product operation.

Location
Install the thermostat about 1.5m (5 ft) 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:

INSTALLATION
1.

Comments

—
—
—
—
—

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.

69-1409-1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Wallplate Installation

The thermostat can be mounted horizontally on the wall
or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.
Position wallplate horizontally on the wall or on a
2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.
1.

Position and level the wallplate (for appearance
only). The thermostat will function correctly even
when not level.

5.
6.

Remove the wallplate from the wall and drill two
3/16 inch (76 mm) holes in the wall (if drywall) as
marked. For firmer material such as plaster, drill
two 7/32 inch (5.56 mm) holes. Gently tap anchors
(provided) into the drilled holes until flush with the
wall.
Position the wallplate over the holes, pulling wires
through the wiring opening.
Loosely insert the mounting screws into the holes.
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.

YES
NO

NO
5 FEET
[1.5 METERS]

CAUTION

Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before wiring.

M10106

Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 6.

IMPORTANT
Use 18 gauge, color-coded thermostat cable for
proper wiring.

Fig. 1. Typical location of thermostat.

2.
3.
4.

WALL
WIRES
THROUGH WALL

Securely tighten each terminal screw.
Push excess wire back into the hole.
Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
THERMOSTAT

WALL
ANCHORS (2)

HEAT
RELAY

FAN
RELAY

MOUNTING
HOLES

1
L1
(HOT)

MOUNTING
SCREWS

M15044

TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

Fig. 2. Mounting the wallplate.
2.

2 NOT AVAILABLE ON T8600A MODELS.

Use a pencil to mark the mounting holes. See Fig.
2.

69-1409—1

M10346A

Fig. 3. Typical hookup in heat only application.

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT
Y

FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).

FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).

3
M4826

COMPRESSOR
CONTACTOR

COOL
DAMPER

HEAT
RELAY

FAN
RELAY

OUTDOOR
TEMPERATURE
SENSOR

Fig. 6. Correct wiring technique.

HEAT
DAMPER

Mounting Thermostat

1.
1

L1
(HOT)
L2

NOTE: To remove the thermostat from the wall, first pull
out at the bottom of the thermostat; remove top
last.

TRANSFORMER
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
M10347A

Engage tabs at the top of the thermostat and wallplate. See Fig. 7.
Press lower edge of case to close and latch.

Fig. 4. Typical hookup in heat and cool
system with one transformers
A. ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.

THERMOSTAT
RC

COMPRESSOR
CONTACTOR

COOL
DAMPER

FAN
RELAY

HEAT
RELAY

OT
4

OUTDOOR
TEMPERATURE
SENSOR

HEAT
DAMPER

B. PRESS LOWER
EDGE OF CASE
TO LATCH.

M14628

1
L1
(HOT)

L1
(HOT)

L2
1

COOLING
TRANSFORMER

Fig. 7. Mounting thermostat on wallplate.

HEATING
TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A
ONE TRANSFORMER SYSTEM.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.

T8600D MODELS REQUIRE POWER TO R TERMINAL AT ALL TIMES.
M10348

Fig. 5. Typical hookup in heat and cool
system with two transformer.

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Using Thermostat Keys

• 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.

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,
• configure Installer Setup,

INCREASE TEMPERATURE
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS

SET RETURN TIMES
AND SETPOINTS

SET LEAVE TIMES
AND SETPOINTS

SET WAKE TIMES
INCREASE TIME SETTING
AND SETPOINTS
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
AND SYSTEM TEST

DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTIONS

SET CURRENT
DAY AND TIME

DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE

RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE

Time
Run
Program

Hold Temp

SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME

Set Current
Day/Time

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Leave

Wake

Return

Sleep

System

Fan

SET SLEEP TIMES
AND SETPOINTS

SELECT FAN
OPERATION
SELECT SYSTEM
OPERATION

Copy

COPY ONE PROGRAMMED
DAY TO ANOTHER DAY

CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
M14624

DECREASE TIME SETTING OR
SCROLL BACKWARD THROUGH
INSTALLER SETUP AND SYSTEM TEST

Fig. 8. T8600D 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.

Time
Run
Program

Set Current
Day/Time

Hold Temp

Day

Daylight
Time

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.

Set Program
Wake

Heat/Cool
Settings

Leave

Return

Sleep

System

Fan

System

Copy

Fan

M14625

Fig. 9. Thermostat System and Fan key locations.

Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.

NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen
or pencil point can damage the keyboard.

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.

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Period
Wake

Time
6:00 AM

System
Em Heat
Off
Cool
Auto
Fan
On

Wait Set Program Set Day/Time Temporary Setting

Table 2. Default Program Settings.
Heat
Setpoint

Cool
Setpoint

Fan
Setting

70°F
(21°C)

78°F
(25.5°C)

Auto

Recovery
Hold for

AM
PM

Filter Em Ht Aux Ht Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Outdoor
Heat Cool
Wake Leave Return Sleep DST

Auto
M14559

Leave

8:00 AM

62°F
(16.5°C)

85°F
(29.5°C)

Auto

Return

6:00 PM

70°F
(21°C)

78°F
(25.5°C)

Auto

Sleep

10:00 PM

62°F
(16.5°C)

82°F
(28°C)

Auto

Fig. 10. Display of all LCD segments.

INSTALLER SETUP
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)

NOTE: For most applications, the thermostat factory
settings will not require changing. Review the
factory settings in Table 2 and if no changes are
necessary, go to the Installer Self-Test section.

FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
M14618

Fig. 11. Display of Installer Setup number and
setting.

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 T8600.

CAUTION

Electric Heat System Configuration Hazard.
Can cause equipment damage.
Configure electrical heat system to 1 in Installer
Setup number 2 to prevent system running
without fan.

A combination of key presses is 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.

IMPORTANT
Only configurable numbers are shown on the
device. Example: If thermostat does not have a
System key, Installer Setup Number 12 will not
be displayed. Review Table 3 factory settings
and mark any desired changes in the Actual
Setting column. When Installer Setup is complete, review the settings to confirm that they
match the system.

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Table 3. Thermostat Installer Setup Options.
Installer Setup
Number
(Press Time ∆
key to
change)

Display

Description

Display

Description

Actual
Setting

Not used.

—

Fan
operationa.

Conventional
applications
where equipment
controls fan
operation in heat
mode.

Heat pump or electric heat
applications where
thermostat controls fan
operation in heat mode.

Not used.

—

Heating
cycle rate.

Not used.

Select

Factory Setting

(Press

—

6—6 cph used
for conventional
heat.

5 thru 11

—

Manual
changeover

Adaptive
Intelligent
Recovery™
control.

Adaptive
Intelligent
Recovery™
control is
activated (system
starts early so
setpoint is
reached by start
of program
period).

Conventional recovery
(system starts recovery at
programmed time).

Degree
temperature
display

Temperature is
displayed in °F

Temperature is displayed
in °C

Not used.

—

Clock
format.

17 and 18

—

Extended
fan operation
in heatinga

No extended fan
operation after
the call for heat
ends.

Fan operation is extended
90 seconds after the call
for heat ends.

Extended
fan operation
in cooling

No extended fan
operation after
the call for cool
ends.

Fan operation is extended
90 seconds after the call
for cool ends.

21 thru 23

—

Not used.

69-1409—1

—

0 or 2

—

12-hour clock
format.

—

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.

System
setting
adjustment

Not used.

—

1, 3, or
9

Other Choices
or key to change)

—

0—Auto changeover.
2—Auto only

—

24-hour clock format.
—

—

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options. (Continued)
Installer Setup
Number
(Press Time ∆
key to
change)

Display

Not used.

25 thru 29

—

Deadband

Heating and
cooling setpoints
can be set no
closer than 3°F to
(1.5°C).

4 thru
10

Not used.

31 and 32

—

Minimum off
time for the
compressor.

Five-minute
minimum off time
for compressor.

0 thru 4

Minimum number of
minutes (0 thru 5) the
compressor will be off
between calls for the
compressor.

Temperature
range stops
in heating.

Highest heating
setpoint setting.

40 to 89

Temperature range (1°F
increments) of heating
setpoint settings.

Temperature
range stops
in cooling.

Lowest cooling
setpoint setting.

46 to 99

Temperature range (1°F
increments) of cooling
setpoint settings/

Not used.

—

Temperature
display
adjustment.

No difference in
displayed
temperature and
actual room
temperature.

3 thru -3

1—Display adjusts to 1°F
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.

Furnace air
filter timer.

30 days (System
run time)

0, 1, 3,
4

0 – off
1 – 10 days
3 – 60 days
4 – 120 days
(Time is counted when
heat, cool or fan is
running.)

Select
Outdoor
temperature
display
(select
models)

Factory Setting

(Press

Description
No outdoor
temperature is
displayed

Display
1

Other Choices
or key to change)
Description

Actual
Setting

Outdoor temperature is
displayed. Needs a
C70891000 Outdoor
Temperature Sensor to
operate.
—

—

Heating and cooling
setpoints can be set no
closer than the 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)
—

—

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options. (Continued)
Installer Setup
Number
(Press Time ∆
key to
change)

Select

Factory Setting
Display

(Press

Description

Humidifier
pad monitor.

Off

Ultraviolet air
treatment
(UV) lamp
monitor.

Off

Actual
Setting

Description
1 – 90 days
2 – 180 days
3 – 365 days
(Time is counted by
calendar days in heat
mode.)

1 – 365 days
(Time is counted by
calendar days in any
mode.)

NOTE: If the current time is Daylight Savings Time,
press Daylight Time until DST is displayed.

Set Day/Time
AM

Daylight
Time

Setting Current Day and Time
1.

Display
1, 2, 3

IMPORTANT
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.

Other Choices
or key to change)

Time
Run
Program

Hold Temp

Set Current
Day/Time

Leave

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Wake

Return

Sleep

System

Fan

Tue
DST

Copy

M14622

Press Set Current Day/Time.

Press Run Program.

NOTE: On initial powerup or after an extended power
loss, 1:00 pm flashes on the display until a key
is pressed

System
Heat

Run
Program

Time
Run
Program

Set Current
Day/Time

Set Program
Wake

Leave

Return

Sleep

Fan
Hold Temp

Heat/Cool
Settings

Day

Daylight
Time

System

Copy

Fan

Tue
Wake

Room
DST

Auto

M14623
Set Day/Time

Set Current
Day/Time

Time
Run
Program

Hold Temp

Set Current
Day/Time

Daylight
Time

Set Program
Wake

Leave

Heat/Cool
Settings

Day

Return

Sleep

System

Fan

Viewing or Resetting Timer Settings

Mon

Copy

When the thermostat activates a timer, the thermostat
flashes Filter until the timer resets.

M14619

Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,
Tue=Tuesday, Wed=Wednesday,
Thu=Thursday, Fri=Friday, Sat=Saturday.

Filter

Set Day/Time

Time
Run
Program

Day

Hold Temp

Set Current
Day/Time

Heat/Cool
Settings

Day

Daylight
Time

Leave

Days

Set Program
Wake

Reset the timer by pressing the i key until the
expired timer is displayed.

Return

Sleep

System

Fan

Tue

M20243

Copy

M14620

Press Time ∆ or Time ∇ until the current time is displayed.

Press the time

key to reset the timer.

NOTE: Tapping the Set Current Day/Time changes the
time in one-hour increments.
Filter

Days

Time
Set Day/Time
AM
Time
Run
Program

Hold Temp

Set Current
Day/Time

Day

Daylight
Time

M20244

Set Program
Wake

Heat/Cool
Settings

Leave

Return

System

Sleep

Fan

Tue

Copy

M14621

69-1409—1

Press the Run Program key.

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
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.

Wait Set Program Set Day/Time Temporary Setting
Recovery
Hold for

AM
PM

Filter Em Ht Aux Ht Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Outdoor
Heat Cool
Wake Leave Return Sleep DST

INSTALLER SYSTEM TEST

System
Em Heat
Off
Cool
Auto
Fan
On
Auto
M14559

Use the Installer System Test to check the thermostat
operation. Refer to Table 4 for a list of the available
system tests.

Fig. 12. LCD segments display.

CAUTION

Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during Installer System Test.
Avoid cycling compressor quickly.

To start the system 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.

M14612

Fig. 13. Test number display.

Table 4. Tests Available In Installer System Test.
Test
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
60 19

Keyboard keys test.

70-79

Thermostat information, including date
code and software versions, is displayed.

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 system test

Table 5. Installer System Test Options.
Keys to
Press

Test
Number

Description

Heating Equipment System Test
Time ∆

Enter heating equipment system test.

Heat comes on. When Installer Setup number 2 is 1; the system fan is also energized.

Heat and system fan turn off.

Cooling Equipment System Test
Time ∆

Change from heating to cooling equipment system test.

Cool and system fan come on.

Cool and system fan turn off.

Fan Equipment System Test
Time ∆

Change from cooling to fan equipment system test.
9

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 5. Installer System Test Options. (Continued)
Keys to
Press

Test
Number

Description

Fan comes on.

Fan turns off.

Key Operation System Test
Time ∆

60 1

Change from fan to key operation system test.

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.

THERMOSTAT INFORMATION
1.

Press the increase key again to display the software revision number (Example: 001 = Revision
number 1).

Press the increase key again to display the
EEPROM identification code. (Example: 314 =
EEPROM ID 314).

Press the Run Program key to exit the system test.
The system test times out after four minutes without any key presses.

Press the Time ∆ key to access the thermostat
information.

M14617

M14613

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)

M14617

M14614

Press the increase key again to display the software identification code. (Example: 02 = software
ID code 2).

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
reading.

M14615

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

TROUBLESHOOTING GUIDE
Table 6. Troubleshooting Guide.
Symptom
Display does not
come on.

Possible Cause
Thermostat is not being
powered.

Action
• 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 connections.
— If 24 Vac is present, proceed with troubleshooting.

Temperature
Room temperature display has
display is incorrect. been reconfigured.

Enter Installer Setup number 37 and reconfigure the display.

Thermostat is configured for °F
or °C display.

Enter Installer Setup number 14 and reconfigure the display.

Bad thermostat location.

Relocate the thermostat.

Temperature
settings will not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)

The upper or lower temperature Check the temperature setpoints:
limits were reached.
• Heating limits are 40 to 90°F (4.5 to 32°C).
• Cooling limits are 48 to 99°F (7 to 37°C).

Heating does not
come on.

No power to the thermostat.

The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the
stops were configured.
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 connections.
— If 24 Vac is present, proceed with troubleshooting.

Thermostat minimum off time is • Wait up to five minutes for the system to respond.
activated.

Cooling does not
come on.

System selection is not set to
Heat.

Set system selection to Heat.

Heating setpoint is below room
temperature.

Check heating setpoint. Set heating setpoint to desired
temperature.

No power to the thermostat.

• 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 connections.
— 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.

69-1409—1

T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 6. Troubleshooting Guide. (Continued)
Symptom

Possible Cause

Action

Heating or cooling
come on
momentarily and
shut off

Heat or cool circuit is opening
up or becoming high
impedance.

Add resistor in parallel with load or install interface relay.

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 Wait a minute after seeing the on indicator and then check the
turns on the fan when the
registers.
furnace has warmed up to a
setpoint.
Heating or cooling equipment is Verify operation of heating or cooling equipment in self-test.
not operating.

Outdoor temperature not displayeda

Option not activated.

Outdoor
Outdoor sensor is connected
temperature
incorrectly.
display is incorrecta Wrong sensor.
aSelect

Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 installed.
Refer to C7089B1000 Installation Instructions and check wiring
between the thermostat and sensor.
Replace sensor with C7089B1000 Sensor.

models.

Automation and Control Solutions
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422

69-1409—1

Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9

G.H. Rev. 11-02

Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.

www.honeywell.com/yourhome

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Title                           : 69-1409 - T8600D Chronotherm® IV Deluxe Programmable Thermostats
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Honeywell Chronotherm Iv T8600D Users Manual 69 1409 Chronotherm® Deluxe Programmable Thermostats

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