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1F81-261

Programmable Electronic
Digital Multi-stage Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS

Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION
Your new White-Rodgers 5-Day/1-Day/1-Day Digital Thermostat
uses the technology of a solid-state microcomputer to provide
precise time/temperature control. This thermostat offers you
the flexibility to design heating and cooling programs that fit
your needs.
Features:
• Separate 5-day (weekday), 1-day (Sat) and 1-day (Sun) programming with four separate time/temperature periods per
day
• Simultaneous heat and cool program storage
• Preprogrammed temperature control
• LCD continuously displays set point, and alternately

•
•
•
•
•
•
•
•
•
•

displays time and room temperature
Backlit display when any key is pushed
Temperature override until next program period
Manual program override (HOLD temperature)
Temporary HOLD
°F/°C convertibility
Temperature range 45° to 90°F
R, C, W, W2, G, Y and Y2 terminals
Optional C terminal (Dual Power option)
Program storage in case of power loss.
2 “AA” Energizer® alkaline batteries included.

PRECAUTIONS
This thermostat is intended for use with a low voltage system;
do not use this thermostat with a line voltage system. If in doubt
about whether your wiring is millivolt, line, or low voltage, have
it inspected by a qualified heating and air conditioning contractor or electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.

! CAUTION

WARNING

Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/or
property damage.
Thermostat installation and all components of the
system shall conform to Class II circuits per the NEC
code.

To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.

SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.5 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)

Shipping Temperature Range:
-4°F to 150°F
APPLICATIONS
For use with:
• Heat/cool systems with up to two stages heat, two
stages cool
DO NOT USE WITH:
• Millivolt systems
• Systems exceeding 30 VAC and 1.5 amps
• 3-wire zoned hydronic heating systems

www.white-rodgers.com
www.emersonclimate.com

PART NO. 37-6228C
Replaces 37-6228B
1
1011

INSTALLATION
REMOVE OLD THERMOSTAT

Screw anchors

1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2. Remove the front cover of the old thermostat. With wires
still attached, remove wall plate from the wall. If the old
thermostat has a wall mounting plate, remove the thermostat
and the wall mounting plate as an assembly.
3. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
4. Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5. Install new thermostat using the following procedures.

ATTENTION!
This product does not contain mercury. However, this product
may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing nonabsorbent gloves, take
up the spilled mercury and place into a container which can
be sealed. If a cell becomes damaged, the unit should be
discarded.
Mercury must not be discarded in household trash. When the
unit this product is replacing is to be discarded, place in a suitable container. Refer to www.white-rodgers.com for location to
send the product containing mercury.

ELECTRIC HEAT SYSTEMS
This thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.), forced air system. It is configured
correctly for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric
heat or heat-pump system that REQUIRES the thermostat to
turn on the fan on a call for heat, locate the GAS/ELECTRIC
switch on the thermostat base (see fig. 1) and switch it to the
ELECTRIC position.This will allow the thermostat to energize the
fan immediately on a call for heat. If you are unsure if the heating/
cooling system requires the thermostat to control the fan, contact
a qualified heating and air conditioning service person.

ATTACH THERMOSTAT BASE TO WALL
1. Remove the packing material from the thermostat. Gently
pull the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit. If necessary, move
the electric heat switch (see ELECTRIC HEAT SYSTEMS,
above).
2. Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 4).
3. Place base over hole in wall and mark mounting hole locations on wall using base as a template.

Mounting
Electric/Gas
holes
switch

Mounting
holes

Figure 1. Thermostat Base

4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Place a level against bottom of base,
adjust until level, and then tighten screws. (Leveling is for
appearance only and will not affect thermostat operation.)
If you are using existing mounting holes, or if holes drilled
are too large and do not allow you to tighten base snugly,
use plastic screw anchors to secure subbase.
6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.

BATTERY LOCATION
2 “AA” alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. You must
remove the battery tag to engage the batteries.
If BATT is displayed, the batteries are low and should be replaced
with fresh “AA” Energizer® alkaline batteries.To replace batteries,
install the batteries along the top of the base (see Fig. 1). The
batteries must be installed with the positive (+) end to the left.

HYDRONIC (HOT WATER OR STEAM)
HEATING SYSTEMS
This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system
that heats with hot water or steam), you must set the thermostat
to operate properly with your system. Change the second option in the configuration menu to SL (see CONFIGURATION
MENU, page 5).

WIRING
NOTE

NOTE
Relay contacts shown are thermostatically operated.

The following wiring diagrams show typical terminal identification and wiring. For proper installation, refer to the original
manufacturer's instructions.

* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.

Thermostat
Control
Circuit
Y

THERMOSTAT

SYSTEM

Heat
Relay
Stage 1

Compressor
Contactor
Stage 2

Hot
24 VAC

Compressor
Contactor
Stage 1

Heat
Relay
Stage 2

Fan
Relay

120 VAC
Neutral

TRANSFORMER

Figure 2. Typical wiring diagram for single transformer systems
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.

Thermostat
Control
Circuit

CUT AND
TAPE OFF!

Hot
120 VAC

24 VAC

Neutral

THERMOSTAT

SYSTEM

Heat
Relay
Stage 1

Compressor
Contactor
Stage 2

Hot
24 VAC

TRANSFORMER

Compressor
Contactor
Stage 1

Heat
Relay
Stage 2

Fan
Relay

120 VAC
Neutral

TRANSFORMER

TWO COMMONS MUST
BE JUMPERED TOGETHER!

Figure 3. Typical wiring diagram for two-transformer systems with NO safety circuits
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.

Thermostat
Control
Circuit

Heat
Relay
Stage 1

Compressor
Contactor
Stage 2

Compressor
Contactor
Stage 1

Fan
Relay

THERMOSTAT
SYSTEM

Limit or
Safety
Switches

24 VAC

120 VAC

Limit or
Safety
Hot
Switches
Neutral

Heat
Relay

24 VAC
Accessory
Relay N.O.
Contact

Stage 2

HEATING
TRANSFORMER

Common

TWO COMMONS MUST
BE JUMPERED TOGETHER!

Common

Limit or
Safety
Switches

24 VAC

120 VAC

Limit or
Safety
Hot
Switches
Neutral

COOLING
TRANSFORMER

Figure 4. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
3

CHECK THERMOSTAT OPERATION
Cooling System

If at any time during testing your system does not operate
properly, contact a qualified service person.

! CAUTION

Turn on power to the system.

Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Move fan switch to ON position. The blower should begin to
operate.
2. Move fan switch to AUTO position. The blower should stop
immediately.

Heating System
1. Move SYSTEM switch to HEAT position. If the heating system
has a standing pilot, be sure to light it.
2. Press
to adjust thermostat setting above room temperature. The heating system should begin to operate.
3. Both stages of the heating system should begin to operate
when the setpoint is set greater than 3˚F above ambient.

To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to COOL position.
2. Press
to adjust thermostat setting below room temperature. The blower should come on immediately on high speed,
followed by cold air circulation
3. Both stages of the cooling system should begin to operate
when the setpoint is set greater than 3˚F below ambient.
to adjust temperature setting above room tem4. Press
perature. The cooling system should stop operating.

4. Press to
adjust temperature setting below room temperature. The heating system should stop operating.

THERMOSTAT QUICK REFERENCE
Before you begin programming your thermostat, you should
be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat
consists of two parts: the thermostat cover and the base. To
remove the cover, pull it straight out from the base. To replace
the cover, line up the cover with the base and press until the
cover snaps onto the base.

1
2

The Thermostat Buttons and Switches

TIME

PRGM

RUN

1 Raises temperature setting.

FAN

HOLD

Fltr

AUTO

SYSTEM

COOL OFF HEAT

2 Lowers temperature setting.
3 TIME button.

4 PRGM (program) button.

5 RUN (run program) button.

MO TU WE TH FR

1 + 2

SA SU

6 HOLD temperature button.

7 FAN switch (ON, AUTO).

FLTR

8 SYSTEM switch (COOL, OFF, HEAT).

HOLD

14 10

BATT

13 12 11 10

The Display

Figure 5. Thermostat display, buttons, and switches

9 Indicates day of the week.
10 Flame icon ( ) is displayed when the SYSTEM switch
is in the HEAT position. Snowflake icon ( )is displayed
(non-flashing) when the SYSTEM switch is in the COOL
position. Snowflake is displayed (flashing) if the thermostat
is in lockout mode to prevent the compressor from cycling
too quickly.
11 Displays BATT when the 2 “AA” batteries are low and should
be replaced.
12 Alternately displays current time and temperature.

13 The word HOLD is displayed when the thermostat is in
the HOLD mode. HOLD is displayed flashing when the
thermostat is in a temporary HOLD Mode.
14 Displays currently programmed set temperature (this is
blank when SYSTEM switch is in the OFF position).
15 Displays FLTR when the system has run for the programmed
filter time period as a reminder to change or clean your air
filter.
16 One indicates first stage, +2 indicates second stage.

INSTALLER/CONFIGURATION MENU
CONFIGURATION MENU
The configuration menu allows you to set certain thermostat operating characteristics to your system or personal requirements.
Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter
the configuration menu. The display will show the first item in
the configuration menu.

The configuration menu table summarizes the configuration
options. An explanation of each option follows.
Press HOLD to change to the next menu item or press TIME
to go backwards to the previous item in the menu. To exit the
menu and return to the program operation, press RUN. If no
keys are pressed within fifteen minutes, the thermostat will
revert to normal operation.

Configuration Menu
Step
1
2

Press Button(s)

Displayed (Factory Default)

PRGM
and RUN
HOLD*

HOLD
(0:00)

Press

to select:

0 to 8 hrs (in
15 minute increments)
SL

COMMENTS
Select temporary Hold time
Select FA or SL (Fast or Slow) heating cycle rate

(FA)

HOLD*

d-L
(ON)

OFF

Select display backlight OFF or ON

HOLD*

E
(ON)

OFF

Select Energy Management Recovery OFF or ON

HOLD*

Filter
(000)

0 to 1950 hours
(in 50 hour increments)

HOLD*

LOC
(OFF)

HOLD*

0 HI
(0)

4 LO to
4 HI

HOLD*

1 + 2
FA

(F)

C
OFF

Select filter replacement run time
Select compressor lockout OFF or ON
Select temperature display adjustment higher or lower
Select temperature display to F or C
Select ON to start 2nd stage immediately when the
setpoint is manually raised more than 3°F in HEAT or
lowered more than 3°F in COOL from room temperature

(ON)

RUN

Returns to normal operation

* Press HOLD to advance to next item or TIME to move backwards to previous item
1) Select Temporary Hold Time - The thermostat can hold any
temperature you set it to for the amount of time you select on
this option. Your choices are 0:00 to 8:00 hours in 15 minute
increments. 0:00 disables the function
Example:
1. You have selected 3:00 hours for the Temporary Hold
time period.
2. With the thermostat set to Heat or Cool, press HOLD
for approximately five seconds until HOLD time (3:00
indicating 3 hours) appears as a setting reminder.
3. After releasing the button, HOLD on the display will blink.
or
to set the temperature to your prefer4. Use
ence. The thermostat will maintain this temperature
setting for 3 hours with HOLD blinking to remind you it
is in Temporary Hold. After 3 hours the thermostat will
go back to the program temperature and HOLD will no
longer blink or display.
2) Select FA or SL (Fast or Slow) Heating Cycle Rate - The
FA setting is frequently used for gas, oil or electric heat. The
SL setting produces a longer heating cycle which is normally
for hot water or steam (hydronic) systems. Both settings
produce very accurate temperature control and can be set
to your personal preference. FA cycles the system just under
1°F and the SL setting cycles at approximately 1.5°F.
3) Select backlit display - The display backlight improves
display contrast in low lighting conditions. Selecting backlight

ON will keep the light on for a short period of time after any
key is pressed. Selecting OFF will keep the light off.
4) Select Energy Management Recovery OFF or ON
- Energy Management Recovery (EMR) causes the
thermostat to start heating or cooling early to make the
building temperature reach the program setpoint at the
time you specify. Heating will start 5 minutes early, cooling
15 minutes early, for every 1° of temperature required to
reach setpoint.
Example:You select EMR and have your heating programmed
to 65° at night and 70° at 7 AM. If the building temperature
is 65° the difference between 65° and 70° is 5°. Allowing
5 minutes per degree the thermostat setpoint will change
to 70° at 6:35 AM. Cooling requires more time per degree
because it takes longer to reach temperature.
5) Select filter replacement run time - The thermostat will
display FLTR after a set time of operation. This is a reminder
to change or clean your air filter. This time can be set from
0 to 1950 hours in 50 hour increments. A selection of 000
will cancel this feature. When FLTR is displayed, you can
clear it by pressing HOLD and RUN at the same time. This
resets the timer and starts counting the hours until the next
filter change. Changing the time in the menu also resets the
timer.
6) Select Compressor Lockout LOC OFF or ON - Selecting
LOC ON will cause the thermostat to wait 5 minutes before
turning on the compressor if the heating and cooling system
5

INSTALLER/CONFIGURATION MENU
loses power. It will also wait 5 minutes minimum between
cooling cycles. This is intended to help protect the compressor from short cycling. Some newer compressors already
have a time delay built in and do not require this feature.
Your compressor manufacturer can tell you if the feature is
already present in their system. When the compressor time
delay occurs it will flash the (snowflake icon) for about five
minutes then turn on the compressor.
7) Select Temperature Display Adjustment 4 LO to 4 HI - Allows you to adjust the room temperature display 4° higher or
lower.Your thermostat was accurately calibrated at the factory

but you have the option to change the display temperature
to match your previous thermostat.
8) Select F° or C° Readout - Changes the display readout to
Centigrade or Fahrenheit as required.
9) Select Stage Fast (ON or OFF) - When selected ON, the
second stage starts as soon as the setpoint temperature
is manually raised 3°F in heat or lowered 3°F in cool from
room temperature. When selected OFF, the second stage
will delay approximately 15 minutes before starting.

OPERATION AND PROGRAMMING
MANUAL OPERATION
• HOLD TEMPERATURE — With the SYSTEM switch set to
HEAT or COOL, momentarily press HOLD button. HOLD will
or
to adjust the temperature. The
be displayed. Use
thermostat will hold the room temperature at the selected
setting until you press RUN button to return to program
operation.
• TEMPERATURE OVERRIDE — Press
or
until the
display shows the temperature you want. The thermostat
will override current programming and keep the room temperature at the selected temperature until the next program
period begins. Then the thermostat will automatically revert
to the program. Raising the temp in heating 3˚F above the
room temp will activate any second stage heating. Lowering
the temp 3˚F below the room temp in cooling will activate
any second stage cooling.
• TEMPORARY HOLD TEMPERATURE —The thermostat
can hold any temperature within its range for the length of
time selected in the configuration menu. See Configuration
Menu section, step 1.

PROGRAMMING YOUR THERMOSTAT
This section will help you plan your thermostat’s program to
meet your needs. For maximum comfort and efficiency, keep the
following guidelines in mind when planning your program.

• During early morning hours, the need for cooling is usually
minimal.

Planning Your Program
Look at the factory preprogrammed times and temperatures
shown in the sample schedule. If this program will suit your
needs, simply press the RUN button to begin running the factory preset program.
If you want to change the preprogrammed times and temperatures, follow these steps.
Determine the time periods and temperatures for your weekday
and weekend programs. You must program four periods for
both the weekday and weekend program. However, you may
use the same heating and cooling temperatures for consecutive
time periods. You can choose start times, heating temperatures,
and cooling temperatures independently for both weekday and
weekend programs (for example, you may select 5:00 AM and 70°
as the weekday 1st period heating start time and temperature,
and also choose 7:00 AM and 76° as the weekday 1st period
cooling start time and temperature).
Use the following table to plan your program time periods and the
temperatures you want during each period. Fill in the complete
table to have a record of your programs.

• When heating (cooling) your building, program the temperatures to be cooler (warmer) when the building is vacant or
during periods of low activity.
SAMPLE
Heating/Cooling Schedule Plan (Factory Program)
WEEKDAYS
(5 Day)
Start
Time

Temp

Start
Time

Temp

Start
Time

Temp

1ST

6:00 AM

70°F

6:00 AM

70°F

6:00 AM

70°F

1ST

2ND

8:00 AM

62°F

8:00 AM

62°F

8:00 AM

62°F

2ND

3RD

5:00 PM

70°F

5:00 PM

70°F

5:00 PM

70°F

4TH

10:00 PM

62°F

10:00 PM 62°F

4TH

1ST

6:00 AM

78°F

6:00 AM

78°F

6:00 AM

78°F

1ST

2ND

8:00 AM

85°F

8:00 AM

85°F

8:00 AM

85°F

3RD

5:00 PM

78°F

5:00 PM

78°F

5:00 PM

78°F

4TH

10:00 PM

82°F

10:00 PM 82°F

HEAT

Period

COOL

HEAT

Period

Heating/Cooling Schedule Plan

SUNDAY
(1 Day)

SATURDAY
(1 Day)

3RD

2ND
3RD
4TH

WEEKDAYS
(5 Day)

SATURDAY
(1 Day)

Start
Time

Temp

SUNDAY
(1 Day)
Start
Time

Temp

OPERATION AND PROGRAMMING
Entering Your Program
Follow these steps to enter the heating and cooling programs
you have selected.

Set Current Time and Day
1. Press TIME button once. The display will show the hour
only.

EXAMPLE:

2. Press and hold either
or
until you reach the correct
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
3. Press TIME once. The display window will show the minutes
only.

EXAMPLE:

4. Press and hold either
or
until you reach the correct
minutes.
5. Press TIME once. The display will show the day of the
week.
or
until you reach the current day of the
6. Press
week.
7. Press RUN once. The display will show the correct time and
room temperature alternately.

Enter Heating Program
1. Move the SYSTEM switch to HEAT.
2. Press PRGM once. “MO TU WE TH FR” (indicating weekday
program) will appear in the display. Also displayed are the
currently programmed start time for the 1st heating period
and the currently programmed temperature (flashing).
MO TU WE TH FR

EXAMPLE:

This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 68° is the programmed temperature (this example reflects factory preprogramming).

3. Press
or
to change the displayed temperature to your
selected temperature for the 1st heating program period.
4. Press TIME once (the programmed time will flash). Press
or
until your selected time appears. The time will
change in 15 minute increments. When your selected time
is displayed, press TIME again to return to the change temperature mode.

5. Press PRGM once. The currently programmed start time and
setpoint temperature for the 2nd heating program period will
appear.
6. Repeat steps 3 and 4 to select the start time and heating
temperature for the 2nd heating program period.
7. Repeat steps 3 through 5 for the 3rd and 4th heating program
periods. Weekday heating programs are now complete.
8. Press PRGM once. “SA” (indicating Saturday program) will
appear in the display, along with the start time for the 1st heating period and the currently programmed temperature.
9. Repeat steps 3 through 7 to complete Saturday heating
programming.
10. Press PRGM once. “SU” (indicating Sunday program) will appear in the display, along with the start time for the 1st heating
period and the currently programmed temperature.
11. Repeat steps 3 through 7 to complete Sunday heating programming.
12. When you have completed entering your heating program,
press RUN.

Enter Cooling Program

! CAUTION
If the outside temperature is below 50°F, disconnect
power to the cooling system before programming.
Energizing the air conditioner compressor during
cold weather may cause personal injury or property
damage.
1. Move SYSTEM switch to COOL position.
2. Follow the procedure for entering your heating program,
using your selected cooling times and temperatures.

CHECK YOUR PROGRAMMING
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
1. Move SYSTEM switch to HEAT position.
2. Press PRGM to view the 1st weekday heating period time and
temperature. Each time you press PRGM, the next heating
period time and temperature will be displayed in sequence for
weekday, then weekend program periods (you may change
any time or temperature during this procedure).
3. Press RUN.
4. Move SYSTEM switch to COOL position.
5. Repeat step 2 to check cooling program.
6. Move SYSTEM switch to HEAT or COOL and press RUN to
begin program operation.
YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND
READY TO PROVIDE MAXIMUM COMFORT AND EFFICIENCY!

TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermostat
by pressing
,
and TIME at the same time. This also resets
the factory defaults to the configuration menu and program. If

the thermostat has power, has been reset and still does not
function correctly contact your heating/cooling service person
or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer® alkaline batteries.

Symptom

Possible Cause

Corrective Action

No Heat/No Cool/No Fan
(common problems)

1.
2.
3.
4.

Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.

No Heat

1.
2.
3.
4.

Pilot light not lit.
System Switch not set to Heat.
Loose connection to thermostat or system.
Furnace Lock-Out Condition. Heat may also
be intermittent.
5. Heating System requires service or
thermostat requires replacement.

Re-light pilot.
Set System Switch to Heat and raise setpoint above room temperature.
Verify thermostat and system wires are securely attached.
Many furnaces have safety devices that shut the system down when
a lock-out condition occurs. If the heat works intermittently contact
the furnace manufacturer or local service person for assistance.
Diagnostic: Set System Switch to Heat and raise the setpoint above
room temperature. Within a few seconds the thermostat should make
a soft click sound. This sound usually indicates the thermostat is
operating properly. If the thermostat does not click, try the reset
operation listed above. If the thermostat does not click after being
reset contact your heating and cooling service person or place of
purchase for a replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify the heating system
is operating correctly.

No Cool

1. System Switch not set to Cool.
2. Loose connection to thermostat or system.
3. Cooling System requires service or
thermostat requires replacement.

Set System Switch to Cool and lower setpoint below room temperature.
Verify thermostat and system wires are securely attached.
Same procedure as diagnostic for No Heat condition except set the
thermostat to Cool and lower the setpoint below the room temperature.
There may be up to a five minute delay before the thermostat
clicks in Cooling if the compressor lock-out option is selected in the
configuration menu (Item 6).

Heat, Cool or Fan Runs Constantly.

1.
2.
3.
4.

Fan Switch set to Fan On.
Possible short in wiring.
Possible short in thermostat.
Possible short in Heat/Cool/Fan system.

Check each wire connection to verify they are not shorted or touching
together. No bare wire should stick out from under terminal screws. Try
resetting the thermostat as described below. If the condition persists
the manufacturer of your system or service person can instruct you on
how to test the Heat/Cool system for correct operation. If the system
operates correctly, replace the thermostat.

Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)

1. The location of the thermostat and/or the size
of the Heating System may be influencing
the cycle rate.

Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)

1. The location of the thermostat and/or the size The cycle rate for cooling is fixed and can not be adjusted. Contact a
of the Cooling System may be influencing the local service person for suggestions.
cycle rate.

Thermostat Setting and Thermometer
Disagree

1. Thermostat thermometer setting requires
adjustment.

The thermometer can be adjusted +/- 4 degrees as
listed in item 7 of the Configuration Menu. No other adjustment is
possible.

Clock Loses or Gains Time

1. Loss of power to thermostat and low
batteries.

The thermostat will maintain its program in memory even with no
power/no batteries but the clock time will be incorrect when power is
restored. See No Heat/No Cool/No Fan (common problems) above for
items to check in the system.

Heat or Cool Starts Early

1. EMR activated

See Configuration Menu (Item 4).

Thermostat Does Not Follow
Program

1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the clock.
3. Voltage spike or static discharge.

Check current clock and program settings including the AM or PM
designations for each time period. If a voltage spike or static discharge
occurs use the Reset Operation listed above.

Blank Display and/or Keypad Not
Responding

1. Loss of power and dead batteries.
2. Voltage Spike or Static Discharge.

Replace batteries and check heat/cool system for proper operation. If a
voltage spike or static discharge occurs use the Reset Operation listed
above.

Blown fuse or tripped circuit breaker.
Furnace power switch to OFF.
Furnace blower compartment door or
panel loose or not properly installed.

Item 2 in the Configuration Menu is the adjustment that controls
the cycle rate. If an acceptable cycle rate is not achieved using the
FA (Fast) or SL (Slow) adjustment contact a local service person for
additional suggestions.

White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
8

www.white-rodgers.com
www.emersonclimate.com

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