Lennox ComfortSense 5000 Series Owner's Guide PDF

2007 Lennox Industries Inc.

Dallas, Texas, USA

ComfortSense 5000 Series Models L5711U and L5732U Programmable Touch Screen

Thermostats

OWNERS GUIDE

IMPORTANT Read and save these instructions.

50606701

2/2008

Page 2

Table of Contents

Thermostat Features Page 2. . . . . . . . . . . . . . . . . . . . . . . . . . Thermostat Display Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . System Settings Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan Settings Page 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Program Your Heating and Cooling Schedule Page 7. . . . . Fan Schedule Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cancel a Schedule Period Page 11. . . . . . . . . . . . . . . . . . . . . . . Set the Time Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Override Temperature Setting Temporary Hold Page 13. . . . . Override Temperature Setting Permanent Hold Page 14. . . . Override Temperature Setting Vacation Hold Page 15. . . . . . Temperature Recovery Feature Page 16. . . . . . . . . . . . . . . . . . . Clean the Thermostat Screen Page 17. . . . . . . . . . . . . . . . . . . . Battery Replacement Page 18. . . . . . . . . . . . . . . . . . . . . . . . . . . Reminder Timers Page 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BuiltIn Compressor Protection Page 21. . . . . . . . . . . . . . . . . . . . Outdoor Temperature Page 22. . . . . . . . . . . . . . . . . . . . . . . . . . . Advanced Heat Pump Features Page 22. . . . . . . . . . . . . . . . . . . Screen Lock Page 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Advanced Settings Page 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Troubleshooting Tips Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermostat Features

Large, clear display with backlight shows the current tem-

perature, the current temperature setting and the time even in the dark.

Menudriven programming makes setup effortless.

Touch screen interaction.

Realtime clock keeps time during power failures and auto-

matically converts to daylight savings time.

Saving Changes" notification assures you that changes

have been saved.

Change / check reminders let you know when it is time to

replace filters, UV lamps, batteries, etc.

Page 3

Override options allow you to easily override the pro-

grammed schedule.

Sameschedule programming allows you to program a

schedule for several days at once. No need to copy.

Armchair programming allows you to remove the thermo-

stat from the wall while you program your schedules.

Thermostat Display

SYSTEM SELECT EMERGENCY HEAT, HEAT, OFF OR COOL

FAN SELECT AUTO, ON OR CIRC

SCHED SELECT TO ENTER SCHED- ULE MODE

HOLD SETS A PERMANENT HOLD AND ACTIVATES VACATION HOLD

CLOCK USED TO SET TIME FORWARD OR BACK

MORE SHOWS FURNACE FILTER, UV LIGHT OR HUMIDIFIER PAD CHANGE REMINDER

SCREEN LOCKS TOUCH SCREEN FOR CLEANING

DOWN ARROW LOWERS TEMPERATURE SETTING

UP ARROW RAISES TEMPERATURE SETTING

AM

FAN

S S MY TE

HEAT

Se ot T

AUTO

Page 4

Thermostat Display (Continued)

TUE SHOWS CURRENT DAY OF THE WEEK

FAN SHOWS FAN SETTING

INSIDE SHOWS CURRENT INSIDE TEMPERATURE

SET TO SHOWS CURRENT TEMPERATURE SETTING

SYSTEM SHOWS CURRENT SYSTEM POSITION

TIME SHOWS CURRENT TIME OF DAY, HOLD TIME REMAINING OR NUMBER OF VACATION DAYS REMAINING

FOLLOWING SCHEDULE INDICATES THAT THERMOSTAT IS FOLLOWING THE PROGRAMMED SCHEDULE

AM

FAN

S S MY TE

HEAT

Se ot T

TUE

OUTSIDE SHOWS CURRENT OUTSIDE TEMPERATURE (IF SYSTEM INCLUDES OUTSIDE TEMPERATURE SENSOR)

AUTO

Page 5

System Settings

PRESS SYSTEM SELECT SETTING OF HEAT, OFF, COOL OR EM HEAT (HEAT PUMP SYSTEMS ONLY)

AM

FAN

S S MY TE

HEAT

Se ot T

Following Schedule

SCHED HOLD CLOCK SCREEN MORE

Inside

TUE

Outside

AUTO

SYSTEM SETTINGS

The system setting options vary based on your heating and/or cooling type.

HEAT Thermostat controls heating system.

OFF Both heating and cooling systems are off.

COOL Thermostat controls cooling system.

AUTO The thermostat switches the system from the heat- ing mode to the cooling mode based on temperature.

EM HEATHeat pump systems only Thermostat controls emergency heat and auxiliary heat, if needed. Heat pump com- pressor is not operational.

Page 6

Fan Settings

PRESS FAN. SELECT SETTING: ON, AUTO OR CIRC.

AM

FAN

S S MY TE

HEAT

Se ot T

Following Schedule

SCHED HOLD CLOCK SCREEN MORE

Inside

TUE

Outside

AUTO

FAN SETTINGS

ON Fan runs continuously. Use this setting for improved air circulation or for more efficient central air cleaning.

AUTO Fan runs only when heating or cooling system is on.

CIRC Fan runs randomly approximately 35% of the time. Use this setting for improved air circulation or for more efficient central air cleaning when you do not want the fan to run continu- ously.

Page 7

Program Your Heating and Cooling Schedule

NOTE The thermostat includes a battery which makes it pos-

sible for you to remove the thermostat from the wallplate during

program. See page 19.

Your thermostat can control up to four different schedule periods per day:

Wake Time when you awaken and want your home at a comfortable temperature.

Leave Time when you leave the home and prefer an ener- gysaving temperature setting.

Return Time when you return home and want your home to return to a more comfortable temperature setting.

Sleep Time when you are asleep and prefer an energy saving temperature setting.

NOTE Schedule times are in 15minute intervals.

EDIT THE SCHEDULE:

1 Press the SCHED key. The SCHEDULE screen will be dis-

played.

2 Press the EDIT key. The screen will change to display the

days of the week across the top.

MON TUE WED THU FRI SUN

OK TO PICK MULTIPLE DAYS

CANCEL

SAT

Page 8

Program Your Heating and Cooling Schedule (Cont.)

3 Select any combination of days to edit. You may select

multiple days. These should be days that you wish to follow

the same schedule. Check marks appear next to the days

that are selected. After the first day is selected, the SCHED-

ULE screen returns to the display.

4 Press the WAKE key. The WAKE key will flash to show it

is selected.

5 Press the UP and DOWN keys to modify time and heat

and cool temperatures shown on the screen.

6 Press LEAVE key and repeat step 5.

7 Press RETURN key and repeat step 5.

8 Press SLEEP key and repeat step 5.

MON TUE WED THU FRI SUN

AM

FAN

CIRC

CANCEL

PERIOD

HEAT

COOL

OK TO PICK MULTIPLE DAYS

DONE WAKE LEAVE RETURN SLEEP

CANCEL

SAT

Page 9

Program Your Heating and Cooling Schedule (Cont.)

NOTE The FAN setting can be programmed for ON, AUTO or

CIRC for each period selected. See following page for more in-

formation about fan setting options.

9 Press DONE key when finished. Saving changes screen

appears to indicate that schedule changes are being saved

to the days selected.

10 Repeat steps 1 through 9 to set a program schedule for

the remaining days of the week. Example: If Mon Fri was

selected first, repeat steps 1 through 9 to program Sat and

Sun.

NOTE To exit the schedule without saving changes, press

CANCEL key at any time.

MON TUEWEDTHUFRI

SAVING CHANGES

Page 10

Fan Schedule

The FAN setting can be programmed for ON, AUTO or CIRC for each period selected:

ON Fan runs continuously. Use this setting for improved air circulation or for more efficient central air cleaning.

AUTO Fan runs only when heating or cooling system is on. CIRC Fan runs randomly approximately 35% of the time. Use this setting for improved air circulation or for more efficient central air cleaning when you do not want the fan to run continu- ously.

Fan Status Display on Home ScreenIf the fan program is scheduled, AUTO is displayed as the fan setting, along with the particular fan setting that has been programmed. For example, if, during the WAKE period, the Fan has been set to AUTO, then AUTO is shown as the fan setting. However, if, during the WAKE period, the Fan has been set to ON, both AUTO and ON are dis- played. AUTO indicates that the fan has been scheduled and ON indicates that the fan has been scheduled to be ON.

Manually Override Scheduled Fan SettingIf the fan setting is scheduled, press the FAN key, then press the desired fan set- ting to manually override the scheduled fan setting. Fan opera- tion will return to the programmed operation when the next schedule period begins.

SCHED HOLD CLOCK SCREEN

THU

AM

FAN

SYSTEM

HEAT

Following Schedule

Inside Set To ON

AUTO

Page 11

Cancel a Schedule Period

You may wish to cancel a period to match your lifestyle. For example, if someone is always home during the day on Tues- day, you can cancel the LEAVE and RETURN periods to have the thermostat hold the WAKE temperature until the SLEEP period is reached.

1 Press the SCHED key. The SCHEDULE screen will be displayed.

2 Press the EDIT key. The screen will change to display the days of the week across the top.

3 Select the day or days of the week that are affected by the schedule change.

4 Press the schedule period you want to cancel: WAKE, LEAVE, RETURN or SLEEP. Once selected the period will flash to show it is selected.

5 Press the CANCEL key. The time, temperature(s) and fan settings will all dissappear from the screen. The bar above the selected period is removed to indicate that the se- lected period was cancelled.

6 Press DONE key.

NOTE A schedule period may be reinstated at any time by entering the schedule edit screen, selecting the period and pressing the arrow keys to set the desired time and tempera- tures.

MON SUN

FAN

HEAT

COOL

OK TO PICK MULTIPLE DAYS

DONE WAKE LEAVE RETURN CANCELSLEEP

TUE WED THU FRI SAT

Page 12

Set the Time

1 Press the CLOCK key. The current time setting will be dis- played as shown below.

2 Use the arrows to set the correct time.

3 Press DONE key.

IMPORTANT The current day of the week should be displayed correctly on this screen. If not, refer to the Advanced Settings section to correct the day of the week display.

DONE

TUE

AM

CANCEL

Page 13

Override Temperature SettingTemporary Hold

You may use the temporary hold function to override the pro- grammed temperature setting until the next scheduled period or until a particular time that you wish.

1 Press the UP or DOWN arrow next to the temperature display to adjust the temperature as desired.

NOTE Hold Temperature Until" appears on the screen. The currently programmed start time of the next scheduled period also appears, as does an additional set of arrows.

2 Use the UP and Down arrows next to the displayed time to set the time that you wish for the thermostat to resume the schedule.

NOTE The time arrows are displayed for approximately seven seconds. Press the screen where the hold temperature time is shown to allow the arrows to reappear.

3 Press CANCEL or SCHED key to cancel temperature hold and resume schedule. Following Schedule" appears on the screen to indicate that the temporary hold has ended.

TUE

PM

FAN

AUTO

SYSTEM

HEAT

Inside

Hold Temperature Until

Set To

SCHED HOLD CLOCK SCREEN

CANCEL

Page 14

Override Temperature SettingPermanent Hold

The permanent hold function overrides the programmed temper- ature setting until the permanent hold is cancelled.

1 Press the HOLD key.

NOTE Permanent Hold" appears on the screen under the cur-

rent time.

2 Use the UP and Down to adjust the temperature to the

setting that you want the thermostat to hold.

3 Press CANCEL key to cancel permanent hold and re-

sume schedule. Following Schedule" appears on the

screen to indicate that the hold has ended.

TUE

AM

FAN

AUTO

SYSTEM

HEAT

Inside Set To

Permanent Hold

SCHED HOLD CLOCK SCREEN

CANCEL

Page 15

Override Temperature SettingVacation Hold

You may use the vacation hold function to override the pro-

grammed temperature setting for a designated number of days.

1 Press the UP or DOWN arrow next to the temperature

display to adjust the temperature as desired.

NOTE Hold Temperature Until" appears on the screen. The

currently programmed start time of the next scheduled period

also appears, as does an additional set of arrows. This is the time

of day that the override will expire after the hold period ends.

2 Press the HOLD key twice. Screen shows Hold Tempera-

ture Until" one day.

3 Press the UP and DOWN arrows to adjust the number of

days you would like to override the schedule.

NOTE Arrows used to adjust the number of days are displayed

for approximately seven seconds. Press the screen where the

number of days are shown to allow the arrows to reappear.

4 Press the CANCEL key to cancel the vacation override

early.

NOTE When the programmed vacation hold expires, the

screen displays Following Schedule" to indicate that the hold

has ended.

SYSTEM

SCHED CLOCK SCREEN

CANCEL

THU

FAN

AUTO

HEAT

Inside

DAYS

Hold Temperature Until

Set To

Page 16

Temperature Recovery Feature

Your thermostat is equipped with a feature that accommodates recovery time to ensure your comfort.

Recovery time is the time that it takes your heating and cooling equipment to recover from energysaving settings programmed during away or asleep periods. Recovery time depends on local weather, your schedule, the contruction of your home and your heating and/or cooling equipment.

Your thermostat tracks the time that it takes for your system to reach your desired settings (recovery period). This allows the thermostat to accommodate this recovery period and to ensure your comfort at the programmed wake and return settings.

For example, your WAKE period is programmed for 6:00 a.m. and 70F. The thermostat activates heating in advance of 6:00 a.m. to ensure that your desired comfort setting of 70F is reached by the time you awake.

A recovery notice is displayed when the system is operating be- fore the scheduled time.

AM

FAN

HEAT

Se ot T

Following Schedule

SCHED HOLD CLOCK SCREEN MORE

Inside

TUE

RECOVERY

AUTO

SYSTEM

Page 17

Clean the Thermostat Screen

The thermostat screen may be cleaned, if necessary.

1 Press the SCREEN key. The thermostat locks the touch

screen for 30 seconds to allow for cleaning.

2 Use a damp cloth slightly moistened with water or

household glass cleaner to clean the screen.

IMPORTANT Do not spray any type of liquid directly onto the

thermostat. Spray the water or household glass cleaner on a

cloth, then use the cloth to clean the thermostat screen.

3 Repeat the above steps as necessary.

4 Press the DONE key to return to the home screen and

normal operation.

OK TO CLEAN SCREEN

DONE

Page 18

Battery Replacement

If your thermostat has batteries, a low battery warning flashes on the home screen for approximately 30 days.

IMPORTANT Batteries should be replaced once per year to

prevent leakage and to prevent loss of battery backup in a pow-

er outtage. You may also wish to replace the batteries prior to

leaving your home for more than a month.

1 When the low battery indicator is flashing, replace the

batteries promptly with three fresh AAA alkaline batter-

ies.

2 Remove the thermostat from the wallplate by pulling

straight out.

WALL

Page 19

Battery Replacement (Continued)

3 Remove the old batteries and insert three fresh AAA al-

kaline batteries, as marked on the thermostat. BACK OF THERMOSTAT

BATTERIES (3)

+

+ +

4 Align the terminal screw blocks with the pins on the

back of the thermostat.

5 Push the thermostat straight onto the wallplate until it

snaps into place.

PINS ON BACK OF

THERMOSTAT

WALLPLATE

TERMINAL

SCREW

BLOCK

Page 20

Reminder Timers

The reminder timers notify you when it is time to change the fur- nace filter, humidifier pad or ultraviolet lamp. When one of the set timers expires, a reset key appears on the home screen.

Reset Timers

1 Change" reminder appears on the screen when the

timer expires.

2 Press the RESET key to restart the timer. If more than

one timer expires at the same time, press the RESET key

until all timers have been reset.

SCHEDHOLDCLOCKSCREENMORE

PM

FAN

AUTO

SYSTEM

HEAT

RESET

Following Schedule

CHANGE FILTER

Set to Inside

MON SUNTUE WED THU FRI SAT

View or Reset Timer Settings Before They Expire

1 Press the MORE key until the timer you want to modify

appears on the screen.

2 Press the EDIT key to change the Timer Reload Value.

Use the UP or DOWN arrow keys to change the number of

run time days. See the Advanced Settings section, step 8

through 10 for more information.

3 Press the DONE key to return to the selected timer.

4 Press the RESET key to reset the timer to the Timer Re-

load Value.

5 Press DONE or CANCEL key to return to home screen.

Page 21

BuiltIn Compressor Protection

The thermostat provides builtin compressor protection (mini- mumoff timer) that prevents the compressor from restarting too early after a shutdown.

The minimumoff timer is activated after the compressor shuts off.

If there is a demand for compressor operation during the delay, the thermostat displays the WAIT message.

When the minimumoff delay expires, COOL ON ( or HEAT ON in heat pump applications) is displayed solidly on the screen and the compressor and fan are allowed to operate to meet the de- mand.

SYSTEM

UET

AM PM

SCHEDHOLDCLOCKSCREENMORE

FAN

AUTO

HEAT

Following Schedule

Wait Cool

Set to

Inside

Page 22

Outdoor Temperature

If an optional outdoor temperature sensor has been installed with your thermostat, the outdoor temperature is displayed in the low- er right corner of the home screen.

If the temperature is not displayed and an outdoor temperature sensor has been installed, press the MORE key until the outside temperature is displayed.

AM

Se ot T

Following Schedule

SCHED HOLD CLOCK SCREEN MORE

Inside

TUE

Outside

SYSTEM

FAN

AUTO

HEAT

Advanced Heat Pump Features (Select Models)

Some thermostat models, when used in heat pump systems which include an optional outdoor temperature sensor, provide additional features. In these applications, the compressor and/or backup heat lockout may be based on the outside temperature.

Page 23

Screen Lock

You can fully or partially lock the keys on the touch screen. See the Advanced Settings section for more information on this fea- ture. If the thermostat displays a Screen Locked" message, your thermostat screen is either fully or partially locked.

Partially Locked Screen

When partially locked, all touch screen keys are locked except the temperature up and down arrow keys and the SYSTEM key access to the user setup options. The Screen Locked message is displayed for 5 to 7 seconds each time the user attempts to press a key that is locked.

When the screen is partially locked, you will be able to adjust the temperature setting up or down; but schedule settings will not be accessible. The temporary temperature change lasts until the next scheduled period. Refer to Temporary Temperature Over- ride section. To cancel the temporary temperature override and return to the programmed schedule, press the CANCEL key.

Fully Locked Screen

When the screen is fully locked, you will still be allowed to access the user setup options through the SYSTEM key; however, all other touch screen keys are locked and are not functional. The Screen Locked message is displayed continuously.

TUE

PM

FAN

AUTO

SYSTEM

HEAT

Following Schedule

Inside Set To

SCREEN LOCKED

SCHED HOLD CLOCK SCREEN MORE

Page 24

Advanced Settings

Your thermostat has many advanced settings that can be used to match your desired use of this important tool. These items have been set by the installer during the installer setup process; how- ever, use the following information to customize the settings for your use.

Use the following steps and the User SetUp table on pages 25 through 27 to customize your thermostat operation.

1 Press and release the SYSTEM key.

2 Press and hold the center blank key for approximately five

seconds, until the screen changes.

CANCEL

TUE

PM

SYSTEM

EM HEAT

CHANGE FILTER UV LAMP HUMIDIFIER PAD

Following Schedule

Inside Set To

OFF

3 Release the key when the thermostat display matches the

display below.

DONE

Page 25

Advanced Settings (Continued)

4 Refer to the figure below to see how the thermostat buttons

are used to make selections.

5 Refer to the table on the following pages to make proper set

up choices for your application.

6 When all setup selections have been made, press the

DONE key to save your settings. The thermostat display will

return to the main screen.

NOTE Thermostats manufactured beginning March 2006 in-

clude program selection to accommodate 2007 daylight savings

calendar. Advanced setting number 330 must be changed to op-

tion 2 at the beginning of 2007 in areas which use the revised

DST calendar in the US and Canada.

DONE

USER SETUP NUMBER CURRENT

SETTING

ADVANCE TO NEXT USER SETUP

PRESS TO EXIT INSTALLER SETUP

CHANGE THE CURRENT SETTING

RETURN TO PREVIOUS USER SETUP

Page 26

Advanced Settings (Continued)

User Set Up No. SetUp Name Selection Description

0120 Date (Year/first) Select first two digits of current calendar year (20 for 2007, etc.)

0130 Date (Year/last) Select last two digits of current calendar year (07 for 2007, etc.) Options: 01 to 99 available.

0140 Date (Month) Select number that represents current calendar month. Options 1 through 12.

0150 Date (Day) Select number that represents current calendar date. Options 1 through 31.

0160 Schedule Op- tions

Select the type of scheduling that will be used. Options: 0 nonprogrammable thermostat 4 fully programmable thermostat with 7day scheduling

0320 Temperature Display Scale

Select the temperature display to be used. Options: 0 Fahrenheit 1 Celsius

table continued on next page

Page 27

Advanced Settings (Continued)

User Set Up No. Selection DescriptionSetUp Name

0330 Daylight Sav- ings

Options: 0 Off. Thermostat time is not automatically adjusted for DST. 1 On. Thermostat time is auto- matically adjusted for Daylight Savings in the Fall and Spring (using the pre2007 DST calen- dar) 2 On. Thermostat time is auto- matically adjusted for Daylight Savings in Fall and Spring (using 2007 DST calendar for US and portions of Canada)

0500 Filter Change Reminder

Select option for filter change re- minder timer. Options: 0 Reminder is off 1 10 run time days 2 30 run time days 3 60 run time days 4 90 run time days 5 120 run time days 6 365 run time days

0510 Humidifier Pad Replacement Reminder

Select option for humidifier pad replacement reminder timer. Op- tions: 0 Reminder is off 1 90 run time days 2 180 run time days 3 365 run time days

table continued on next page

Page 28

Advanced Settings (Continued)

User Set Up No. Selection DescriptionSetUp Name

0520 UV Lamp Re- placement Re- minder

Select option for UV lamp re- placement reminder timer. Op- tions: 0 Reminder is off 1 365 run time days

0540 Number of Peri- ods

Select option for number of scheduling periods. Options: 2 Two periods (wake and sleep) 4 Four periods (wake, leave, re- turn, sleep)

0640 Clock Format Select clock format. Options: 12 12hour clock 24 24hour clock

0670 Screen Lock Out

Select screen lockout. Options: 0 All keys are functional; screen is unlocked. 1 Screen partially locked only temp. up and down keys and ability to enter installer setup mode and modify setup selec- tions are enabled. 2 Screen fully locked only ability to enter installer setup mode and modify setup selec- tions are enabled.

Page 29

Troubleshooting Tips

If... Then...

Key to the right of the screen key is blank.

MORE key remains blank unless the Furnace Filter Change Reminder has been turned on. See User SetUp Number 0500.

Display is blank.

Check that fresh AAA alkaline batteries are installed as marked on the thermostat.

Temperature settings do not change.

Check that temperature settings are:

Heating 40F to 90F (4.5C to 32C).

Cooling 50F to 99F (10C to 37C).

Heating system does not turn on.

Press the SYSTEM key to set to heat.

Check the heat temperature setting to be sure it is set above the room temperature and Heat On" is displayed solidly on the screen.

Make sure circuit breaker is not tripped.

Check the power switch at the heating and/or cooling system to make sure it is on.

Check the furnace door to make sure it is closed securely.

Wait five minutes for the heating system to respond.

If the problem has not been identified and corrected, contact a qualified service techni- cian.

table continued on next page

Page 30

Troubleshooting Tips

If... Then...

Cooling system does not turn on.

Press SYSTEM key to set to Cool.

Check the cool temperature setting to be sure it is set below the room temperature and Cool On" is displayed solidly on the screen.

Make sure circuit breaker is not tripped.

Check the power switch at the heating and/or cooling system to make sure it is on.

Check the furnace door to make sure it is closed securely.

Wait five minutes for the cooling system to respond.

If the problem has not been identified and corrected, contact a qualified service techni- cian.

Cannot set Sys- tem setting to Cool.

Check Installer SetUp Number 170: Heating and/or Cooling Type*. Make sure the setting matches the installed heating and/or cooling system.

Heat On" is not displayed on the screen.

Set the System setting to Heat and set the temperature setting above the room tempera- ture. If Heat On" is shown solidly in the dis- play, but the heating system does not turn on, see Heating system does not turn on" suggestions on the previous page.

table continued on next page

Page 31

Troubleshooting Tips

If... Then...

Cool On" is not displayed on the screen.

Set the System setting to Cool and set the temperature setting below the room tempera- ture. If Cool On" is shown solidly in the dis- play, but the cooling system does not turn on, see Cooling system does not turn on" suggestions at the top of this page.

Wait" is dis- played on the screen.

Compressor minimumoff timer is activated. Wait up to five minutes for the compressor to turn on.

Fan does not turn on in a call for heat (elec- tric furnaces only)

Check Installer SetUp 0180: Fan Control in Heating*. Make sure Electric Heat option is selected.

Both heating and cooling systems are op- erating at the same time.

Check Installer SetUp Number 170: Heating and/or Cooling Type*. Make sure the setting matches the installed heating and/or cooling system.

Check to ensure that bare portions of wires are not touching.

Heating is run- ning in Cool mode.

Check Installer SetUp Number 170: Heating and/or Cooling Type*. Make sure the setting matches the installed heating and/or cooling system.

table continued on next page

Page 32

Troubleshooting Tips

If... Then...

Heating system does not turn off and the heat temperature setting is set below the room temperature (Heat On" is not shown in display.)

Check Installer SetUp Number 170: Heating and/or Cooling Type*. Make sure the setting matches the installed heating and/or cooling system.

Red LED is lit in the upper right corner of the thermostat when the sys- tem monitor de- tects a possible problem.

A system monitor is wired to the thermostat L terminal. Refer to suggestions given in Heat- ing or Cooling System Does Not Turn On sections in this table.

*Refer to Installation Instructions for access to Installer SetUp procedures.