Installation Instructions for
1
2
3
CAUTION
!
WIRE CUTTER/STRIPPER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
Mounting
Description
Heat Pump (No Aux or Emergency Heat) Yes
Heat Pump (with Aux or Emergency Heat) Yes
Standard Heat & Cooling Systems No
Standard Heat Only Systems No
Millivolt Heat Only Systems – Floor or Wall Furnaces No
Standard Central Air Conditioning No
Gas or Oil Heat No
Electric Furnace No
Hydronic (Hot Water) Zone Heat – 2 Wires No
Hydronic (Hot Water) Zone Heat – 3 Wires No
Heating & Air Conditioning
1F72
5/2 Day Programmable
Heat Pump Thermostat
CONTENTS
Preparations .................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat .......................... 1-2
Mounting and Wiring ................................... 2-3
Check Thermostat Operation ...................... 4-5
Programming your Thermostat ................... 6-7
Specifications ................................................ 7
Troubleshooting .......................................... 7-8
YOUR THERMOSTAT REPLACES
THERMOSTAT DETAILS
W904
Clip for Celsius
(current location)
W905
Clip for Slow Cycle
(current location)
Mounting
hole
(location on
earlier models)
W903
W903
W904 & W905
(location on earlier
models)
Figure 1. Thermostat base
W903
W903
Clip to Disable
EMR Feature
(current location)
E
R
W2
O/B
L
CY
G
W906 for Emergency
Heat Second Stage
PREPARATIONS
Assemble tools required as shown below.
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
REMOVING OLD THERMOSTAT
hole
O/B
Terminal
Switches
Selection
Fan Control
www.white-rodgers.com
www.emersonclimate.com
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main
fuse or circuit breaker until installation is complete.
Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed from.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts:
a. The cover, which may be either a snap-on or hinge type.
O/B
b. The base, which is removed by loosening all captive screws.
c. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adaptor plate.
2. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
3. 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.
4. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
5. Disconnect the wires from the old thermostat one at a time.
DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
PART NO. 37-6498B
Replaces 37-6498A
1122
4
CAUTION
!
3
REMOVING OLD THERMOSTAT
WARNING
!
CONTINUED FROM FIRST PAGE
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 non-absorbent 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
shipping container. Refer to www.white-rodgers.com for location
to send the product with mercury.
O/B Terminal Switch Selection
The O/B switch on this thermostat is factory set to “O” position.
This will accommodate the majority of heat pump applications,
which require the changeover relay to be energized in COOL. If the
thermostat you are replacing or the heat pump being installed with
this thermostat requires a “B” terminal, to energize the changeover
relay in HEAT, the O/B switch must be moved to the “B” position.
Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.
MOUNTING AND WIRING
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.
Electric/Gas Jumper (Fan Option)
If your emergency or auxiliary system will energize the blower, then jumper W906 on the thermostat base must be cut
(see fig. 1).
If your emergency or auxiliary heat system requires that the thermostat energize the fan circuit, do not cut jumper W906.
If you are unsure of your application, contact a qualified
serviceperson.
°F or °C Selection
The factory default setting for temperature display is Fahrenheit.
If you want the temperature in Celsius, clip jumper W904.
Fast or Slow Cycle Selection
The factory default setting is fast cycle, which cycles 1st stage
at approximately 1.2°F and 2nd stage 0.75°F. If you prefer slow
cycle, clip jump W905. The 1st stage and 2nd stage would be
1.5°F and 1.2°F respectively.
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.
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.
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
This thermostat does not require batteries to operate. The 2
“AAA” alkaline batteries are for the thermostat to remember the
programming if AC voltage is lost. If the display shows BATT or
when AC power is not present, the batteries are
low and should be replaced with fresh “AAA” alkaline batteries.
For best results, replace all batteries with new premium brand
alkaline batteries such as Duracell® or Energizer®. To replace the
batteries, install the batteries along the top of the base (see fig.
1). The batteries must be installed with the positive (+) ends to
the right.
Energy Management Recovery (EMR)
This thermostat is set to operate with EMR. This causes the
thermostat to start the heating or cooling system early to have
the room temperature reach the program setpoint at the time the
period is to start.
To disable EMR, clip jumper W903 (see Fig. 1).
2
MOUNTING AND WIRING
4
L
R
E
24 VAC
120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 2. Typical wiring diagram for single transformer systems
TRANSFORMER
(Class II)
Changeover
Relay*
CYO/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay
Emergency
Relay
See Note **
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
L
R
E
SYSTEM
MONITOR
SWITCH
G W2
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
Changeover
Relay*
CYO/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay
Emergency
Relay
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC 120 VAC
HOT
NEUTRAL
THERMOSTAT
SYSTEM
HOT
NEUTRAL
120 VAC
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
24 VAC
Limit or
Safety
Switches
COMMON
COMMON
Auxiliary
Heating
Transformer
(Class II)
Heat Pump Transformer
(Class II)
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
Polarity must be observed. If the HOT side of the second transformer
is jumpered to the COMMON side of the first transformer a short will
be made. Damage to equipment will occur when power is restored.
NOTE
The accessory relay scheme
is required when safety
circuits exist in both systems.
NOTE
See Note **
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
L
R
E
24 VAC
120 VAC
Hot
SYSTEM
MONITOR
SWITCH
Neutral
THERMOSTAT
SYSTEM
G W2
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
TRANSFORMER
(Class II)
Changeover
Relay*
CYO/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Aux
Relay
(Stage 2)
Fan
Relay
Emergency
Relay
Limit or
Safety
Switches
TWO COMMONS MUST
BE JUMPERED TOGETHER!
HOT
NEUTRAL
120 VAC
24 VAC
CUT AND
TAPE OFF!
If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.
NOTE
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
See Note **
CONTINUED FROM SECOND PAGE
3
CAUTION
!
5
CHECK THERMOSTAT OPERATION
CAUTION
!
NOTE
To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.
If at any time during testing your system does not operate properly,
contact a qualified serviceperson.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to the system.
2. Move fan switch to ON position. The blower should begin to
operate.
3. Move fan switch to AUTO position. The blower should stop
immediately.
Do not allow the compressor to run unless the compressor oil heaters have been operational for 6 hours and the
system has not been operational for at least 5 minutes.
Heating System
1. Move SYSTEM switch to HEAT position. If the auxiliary heating
system has a standing pilot, be sure to light it.
2. Press
temperature. The heat pump system should begin to operate.
However, if the Flame icon ( ) and Snowflake icon ( ) are
flashing, the compressor lockout feature is operating (see
Configuration menu, item 2.)
3. Adjust temperature setting to 4° above room temperature. The
auxiliary heat system should begin to operate and the Flame
icon (
4. Press
perature. The heating system should stop operating.
EMER bypasses the Heat Pump to use the heat source wired
to terminal E on the thermostat. EMER is typically used when
compressor operation is not desired, or you prefer back-up
heat only.
1. Move SYSTEM switch to EMER position. EMER will flash on
the display.
2. Press
perature. The Aux heating system will begin to operate. The
Flame icon ( ) will display flashing to indicate that the Aux
system is operating.
3. Press
The Aux heating system should stop operating.
to adjust thermostat setting to 1° above room
) will be flashing.
to adjust thermostat setting below room tem-
Emergency System
to adjust thermostat setting above room tem-
to adjust the thermostat below room temperature.
Cooling System
1. Move SYSTEM switch to COOL position.
2. Press
ture. The blower should come on immediately on high speed,
followed by cold air circulation.
3. Press
perature. The cooling system should stop operating.
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, gently pull it straight out from the base. To replace the
cover, line up the cover with the base and press gently until the
cover snaps onto the base.
to adjust thermostat setting below room tempera-
to adjust temperature setting above room tem-
The Thermostat Buttons and Switches
1
(Up arrow) Raises temperature setting.
2
(Down arrow) Lowers temperature setting.
3
TIME button.
4
PRGM (program) button.
5
RUN (program) button.
HOLD button.
6
FAN switch (ON, AUTO).
7
8
SYSTEM switch (COOL, OFF, HEAT, EMER).
The Display
9
Indicates day of the week.
10
Indicates a malfunction with the system.
11
Flame icon (
the HEAT position. Flame icon ( ) is displayed flashing when
2nd-stage heat (Aux or Emergency) is energized. Snowflake
icon ( ) is displayed (non-flashing) when the SYSTEM switch
is in the COOL position. Snowflake and Flame icons will
be displayed (flashing) if the thermostat is in lockout mode
to prevent the compressor from cycling too quickly.
) is displayed when the SYSTEM switch is in
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system.
4
5
CHECK THERMOSTAT OPERATION
Configuration Menu
CONTINUED FROM FOURTH PAGE
EMER is displayed flashing when the system switch is in EMER
12
position.
13
Alternately displays current time and temperature.
The word HOLD is displayed when the thermostat is in the
14
HOLD mode.
Displays currently programmed set temperature (this is blank
15
when SYSTEM switch is in the OFF position).
“BATT” or
16
are low and should be replaced.
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 chart 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.
1. In the run mode, if the setpoint temperature is manually raised
by 3°F (2°C) or more above the actual temperature with the TEM-
PERATURE UP key, and the fast second stage feature is enabled,
FA on, the second stage will energize immediately. With FA off,
second stage will not energize until the setpoint temperature is
1°F or more above actual temperature for more than ten minutes.
2. Select Compressor Lockout CL OFF or ON – Selecting CL ON
will cause the thermostat to wait 5 minutes before turning on the
compressor if the heating and cooling system loses power. It will
also wait 5 minutes minimum between cooling and heating 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 lockout feature is already present in their system.
When the thermostat compressor time delay occurs it will flash
the Snowflake and Flame Icons for about five minutes.
is displayed when 2 “AAA” batteries
3. Select Temperature Display Adjustment 3 LO to 3 HI – Allows
you to adjust the room temperature display up to 3° 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. The current or adjusted room temperature
will be displayed on the left side of the display.
4. Select Backlit Display – (Not available on earlier models) The
display backlight improves display contrast in low lighting conditions. Selecting backlight ON will keep the light on continuously.
Selecting Backlight OFF will keep the light off.
Operating Features
Now that you are familiar with the thermostat buttons and display,read
the following information to learn about the many features of the
thermostat.
• SIMULTANEOUS HEATING/COOLING PROGRAM STORAGE — When programming, you can enter both your heating
and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.
• TEMPERATURE OVERRIDE — Press
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.
• HOLD TEMPERATURE — The thermostat can hold any tem-
perature within its range for an indefinite period, without reverting
to the programmed temperature. Press HOLD button. HOLD will
be displayed. Then choose the desired temperature by pressing
or . The thermostat will hold the room temperature
at the selected setting until you press the RUN button to start
program operation again.
• ENERGY MANAGEMENT RECOVERY — 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
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 allows more time per degree because it takes longer
to reach temperature.
• °F/°C CONVERTIBILITY — The factory default setting is Fahr-
enheit. Clipping W904 jumper on the circuit board (see fig. 1)
will alter this feature to Celsius temperature setting.
or until the
Step Press Button(s) Displayed (Factory Default) Press or to select: COMMENTS
1
2
3
4**
5
* Press HOLD to advance to next item or TIME to move backwards to previous item
* Not available on earlier models
*
PRGM
and RUN
HOLD*
HOLD*
HOLD*
RUN
FA
(on)
CL
(OFF)
0 HI
(0)
dL
(ON)
OFF
ON
3 LO TO
3 HI
OFF
Select Fast (on) or slow (off) Second Stage Heat
Select Compressor lockout OFF or ON
Select temperature display adjustment higher or lower
Select display backlight OFF or ON
Returns to normal operation
5
6
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.
• Whenheating(cooling)yourbuilding,programthetemperatures to be cooler (warmer) when the building is vacant or
during periods of low activity.
• Duringearlymorninghours,theneedforcoolingisusually
minimal.
Look at the factory preprogrammed times and temperatures shown
below. 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 table at the bottom of the
page to plan your program time periods and the temperatures
you want during each period. You may also want to look at the
sample program table to get an idea of how the thermostat can
be programmed.
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).
PM
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.
6. Press
or until you reach the current day of the
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 70° 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 4 and 5 to select the start time and heating
temperature for the 2nd heating program period.
7. Repeat steps 4 through 6 for the 3rd and 4th heating program
periods. Weekday heating programs are now complete.
8. Press PRGM once. “SA SU” (indicating weekend program)
will appear in the display, along with the start time for the 1st
heating period and the currently programmed temperature.
AM
Heating/Cooling Schedule Plan (Factory Program)
WEEKDAY (5 DAY)
Period
COOL HEAT
1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
Start
Time Temperature
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
SAMPLE
70°F
62°F
70°F
62°F
78°F
85°F
78°F
82°F
WEEKEND (2 DAY)
Start
Time Temperature
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
70°F
62°F
70°F
62°F
78°F
85°F
78°F
82°F
Heating/Cooling Schedule Plan
WEEKEND (2 DAY)
Start
Time Temperature
Period
COOL HEAT
WEEKDAY (5 DAY)
Start
Time Temperature
1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
6
8
6
PROGRAMMING YOUR THERMOSTAT
7
CONTINUED FROM SIXTH PAGE
Check Your Programming
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
9. Repeat steps 4 through 8 to complete weekend heating programming.
10. When you have completed entering your heating program,
press RUN.
Enter Cooling Program
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.
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
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 temperatures.
6. Press RUN to begin program operation.
YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED
AND READY TO AUTOMATICALLY PROVIDE MAXIMUM
COMFORT AND EFFICIENCY!
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:
-40°F to 150°F
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
the factory defaults. If the thermostat has power, has been reset
, and TIME at the same time. This also resets
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
No Heat
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
1. Pilot light not lit.
2. System Switch not set to HEAT.
3. Loose connection to thermostat or system.
4. Furnace Lock-Out Condition. Heat may
also be intermittent.
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 “AAA” alkaline batteries.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
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 down
when a lock-out condition occurs. If the heat works
intermittently contact the furnace manufacturer or local
service person for assistance.
7
8
PROGRAMMING YOUR THERMOSTAT
CONTINUED FROM SEVENTH PAGE
Symptom Possible Cause Corrective Action
No Heat (continued)
No Cool
Heat, Cool or Fan Runs Constantly.
Furnace (Air Conditioning) Cycles
Too Fast or Too Slow (narrow or wide
temperature swing)
Thermostat Setting and Thermostat
Thermometer Disagree
Thermostat Does Not Follow Program
Blank Display and/or Keypad
Not Responding
5. Heating system requires service or thermostat requires replacement.
1. System Switch not set to COOL.
2. Loose connection to thermostat or system.
3. Cooling system requires service or
thermostat requires replacement.
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
4. Fan Switch set to Fan On.
1. The location of the thermostat and/or the
size of the Heating (Cooling) System may
be influencing the cycle rate.
1. Thermostat thermometer setting requires
adjustment.
1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the clock.
3. Voltage spike or static discharge..
1. Voltage spike or static discharge, Use the Reset Operation listed above.
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 is operating correctly.
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.
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 above. 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.
Digital thermostats normally provide precise temperature
control and may cycle faster than some older mechanical
models. A faster cycle rate means the unit turns on and
off more frequently but runs for a shorter time so there is
no increase in energy use. If you would like to increase
the cycle time, clip Jumper W-905 as mentioned in the
instructions for Hydronic Heating Systems. It is not possible to shorten the cycle time. If an acceptable cycle rate
is not achieved as received or by clipping W-905 contact
a local service person for additional suggestions.
Thermostat thermometer can be adjusted +/-3 degrees.
See Temperature Display Adjustment in the Operation
section
Check current clock and program settings including the
AM or PM designations for each time period. If a voltage
spike or a static discharge occurs use the Reset Operation listed above.
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
HOMEOWNER HELP LINE: 1-800-284-2925
www.white-rodgers.com
www.emersonclimate.com
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