1F87-251
Programmable Electronic Digital 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 7-Day Digital Thermostat uses the
technology of a solid-state microcomputer to provide precise
time/temperature control. This thermostat offers you the flexibil-
ity to design heating and cooling programs that fit your needs.
• Temperature override until next program period
• Manual program override (HOLD temperature)
• °F/°C convertibility
• Temperature range 45° to 90°F
• RC, RH, W, Y, G , O and B terminals
Features:
• Separate program for each day of the week with four separate
time/temperature settings per day
• B and O terminals for single stage heat pumps (no auxiliary
heat) or damper operation
• Simultaneous heat and cool program storage
• Preprogrammed temperature control
• LCD continuously displays setpoint, and alternately dis-
plays time and room temperature
• Program storage in case of power loss.
• Battery powered (2 "AA" Energizer® alkaline batteries in-
cluded)
• Backlit display
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
itinspectedbyaqualifiedheatingandairconditioningcontractor
or electrician.
WARNING
!
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not exceed the specification ratings.
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.
Allwiringmustconformtolocalandnationalelectricalcodesand
ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling ordistortingcomponents could cause
the control to malfunction.
Thermostat installation and all components of the
system shall conform to Class II (current limited) cir-
cuits per the NEC code. Failure to do so may cause a
fire hazard.
CAUTION
!
To prevent electrical shock and/or equipment dam-
age, disconnect electric power to system at main fuse
or circuit breaker box until installation is complete.
SPECIFICATIONS
ELECTRICAL DATA
APPLICATIONS
Electrical Rating:
For use with:
8 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
•
•
•
•
Standard heat/cool or heat only systems
Electric heat systems
Gas or oil fired systems
Gas systems with intermittent ignition devices (I.I.D.)
and/or vent dampers
Hydronic (hot water or steam) systems
Single-stage heat pump systems (no auxiliary heat)
Millivolt systems
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
•
•
•
DO NOT USE WITH:
•
•
•
Multi-stage systems
Systems exceeding 30 VAC and 1.5 amps
3-wire zoned hydronic heating systems
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-6417C
Replaces 37-6417B
0441
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JUMPER
WIRE
THERMOSTAT
Y
B
O
G
W
RC
RH
THERMOSTAT
SYSTEM
SYSTEM
Y
B
O
G
W
RC
RH
Hot
Cooling
System Relay System
Fan
Heating
24 VAC
120 VAC
Neutral
Fan
Relay
Heating
System
Hot
HEATING TRANSFORMER
(Class II Current Limited)
24 VAC
120 VAC
Neutral
NOTE
For 2-wire Heat only,
attach to RH and W
Hot
TRANSFORMER
(Class II Current Limited)
24 VAC
120 VAC
Neutral
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
COOLING TRANSFORMER
(Class II Current Limited)
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
JUMPER
WIRE
THERMOSTAT
Y
B
O
G
W
RC
RH
SYSTEM
JUMPER
WIRE
JUMPER
WIRE
Cooling
System
Fan
Relay
THERMOSTAT
SYSTEM
Hot
Y
B
O
G
W
RC RH
24 VAC
120 VAC
Neutral
Reversing Compressor Fan
Valve*
Contactor Relay
TRANSFORMER
(Class II Current Limited)
Hot
24 VAC
120 VAC
Neutral
Figure 3. Typical wiring diagram for
cool only, 3-wire, single transformer systems
* Reversing valve is energized when the
system switch is in the COOL position
TRANSFORMER
(Class II Current Limited)
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
JUMPER
WIRE
JUMPER
WIRE
JUMPER
WIRE
THERMOSTAT
SYSTEM
Y
B
O
G
W
RC RH
THERMOSTAT
SYSTEM
Y
B
O
G
W
RC RH
Cooling
System
Fan
Relay
Heating
System
Reversing Compressor Fan
Valve*
Contactor Relay
Hot
Hot
24 VAC
24 VAC
120 VAC
Neutral
120 VAC
Neutral
* Reversing valve is energized when the
system switch is in the HEAT position
TRANSFORMER
(Class II Current Limited)
TRANSFORMER
(Class II Current Limited)
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
Heating System
Cooling System
1. Move SYSTEM switch to HEAT position. If the heating
CAUTION
!
system has a standing pilot, be sure to light it.
Topreventcompressorand/orpropertydamage, ifthe
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
2. Press
to adjust thermostat setting above room tempera-
ture. The heating system should begin to operate.
3. Press
to adjust temperature setting below room tem-
1. Move SYSTEM switch to COOL position.
perature. The heating system should stop operating.
2. Press
to adjust thermostat setting below room tem-
perature. The blower should come on immediately on high
speed, followed by cold air circulation
3. Press
to adjust temperature setting above room tem-
perature. The cooling system should stop operating.
3
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OPERATION
Before you begin programming your thermostat, you should be
familiarwithitsfeaturesandwiththedisplayandthelocationand
operation of the thermostat buttons. Your thermostat consists of
two parts: the thermostat cover and the base. To remove the
cover, pullitstraightoutfromthebase. Toreplacethecover, line
up the cover with the base and press until the cover snaps onto
the base.
1
2
The Thermostat Buttons and Switches
FAN
SYSTEM
TIME
PRGM
RUN
HOLD
1
2
3
4
5
6
7
8
Raises temperature setting.
Lowers temperature setting.
ON AUTO COOL OFF HEAT
Fltr
8
3
4
5
6
7
TIME button.
9
9
PRGM (program) button.
MO TU WE TH FR
SA SU
AM
RUN (run program) button.
HOLD temperature button.
FAN switch (ON, AUTO).
PM
FLTR
HOLD
BATT
15 12
10
13 12 11 10
14
Figure 8. Thermostat display, buttons, and switches
SYSTEM switch (COOL, OFF, HEAT).
Press HOLD to change to the next menu item or press TIME to
go backwards to the previous itemin 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.
The Display
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)whentheSYSTEMswitchisintheCOOLposition.
Snowflake is displayed (flashing) if the thermostat is in
lockout mode to prevent the compressor from cycling too
quickly.
1) 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 nor-
mally 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 approxi-
mately 1.5°F.
11
12
Displays "LO BATT" when the 2 "AA" batteries are low and
should be replaced. Nothing else will be displayed.
2) Select backlit display - The display backlight improves
display contrast in low lighting conditions. Selecting back-
light ON will keep the light on for a short period of time after
any key is pressed. Selecting OFF will keep the light off.
Alternatelydisplayscurrenttimeandtemperature.Displays
"LO" in the minutes field when batteries are low.
13 The word "HOLD" is displayed when the thermostat is in
the HOLD mode.
3) Select Energy Management Recovery OFF or ON -
Energy Management Recovery (EMR) causes the thermo-
stat 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.
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 pro-
grammedfiltertimeperiodasaremindertochangeorclean
your air filter.
Example: You select EMR and have your heating pro-
grammed 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.
CONFIGURATION MENU
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal require-
ments.
4) 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
of000willcancelthisfeature. When "FLTR"isdisplayed,
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.
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.
4
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Configuration Menu
Step
Press Button(s)
Displayed (Factory Default) Press
or
SL
to select:
COMMENTS
Select FA or SL (Fast or Slow) heating cycle rate
1
PRGM
and RUN
(FA)
d-L
(ON)
2
3
4
5
6
HOLD
*
OFF
OFF
Select display backlight OFF or ON
E
(ON)
Select Energy Management Recovery OFF or ON
HOLD
*
*
HOLD
Filter
(000)
0 to 1950 hours
(in 50 hour increments)
Select filter replacement run time
HOLD
HOLD
HOLD
RUN
*
*
*
LOC
(OFF)
ON
Select Compressor lockout OFF or ON
Select temperature display adjustment higher or lower
0 HI
(0)
4 LO to
4 HI
7
8
Select temperature display to F or C
Returns to normal operation
(F)
C
* Press HOLD to advance to next item or TIME to move backwards to previous item
5) 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
loses power. It will also wait 5 minutes minimum between
coolingcycles. Thisisintendedtohelpprotectthecompres-
the desired temperature by pressing
or
. The
thermostat will hold the room temperature at the selected
setting until you press RUN button to start program opera-
tion again.
• LOW BATTERY INDICATOR—If the 2 “AA” alkaline bat-
teries are low and should be replaced, the display will be
blank except for “LO BATT”. When the batteries are low,
pressing any button will cause the display to operate for ten
seconds. After ten seconds, the displaywill be blankexcept
for “LO BATT”. You cannot program with low batteries, but
you can override setpoint temperature. After “LO BATT”
has been displayed for 4 weeks, the thermostat will raise
the temperature 10 degrees above your setpoint on COOL
mode and will drop temperature 10 degrees below your
setpoint on HEAT mode.
sor 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.
6) 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.
• SIMPLIFIED COPY DAY FUNCTION — This feature al-
lows Monday's program to be copied into the rest of the
week's programming. This feature is available the first
time you program your thermostat. To use this feature,
simply enter the program for Monday as described in
PROGRAMMING YOUR THERMOSTAT, and then press
RUN or HOLD. The only way to restore this feature is to
complete a software reset (see Reset Operation under
TROUBLESHOOTING section).
7) Select F° or C° Readout - Changes the display readout to
Centigrade or Fahrenheit as required.
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—Whenprogramming,youcanenterbothyour
heating and cooling programs at the same time. There is no
need to reprogram the thermostat at the beginning of each
season.
• COPY DAY FUNCTION — This feature allows a selected
day's program to be copied to the desired day's program-
ming. To use this feature: in PRGM mode, select the day
to be copied from by pressing the HOLD button. Enter the
program for the selected day as described in PROGRAM-
MING YOUR THERMOSTAT. Press and hold the TIME
button for 4 seconds to begin the Copy mode. The LCD will
display "COPY" and the selected day to be copied. The
day the program will copy to will be flashing. Press the
HOLD button to select the day you want to copy to. Press
TIME to complete the Copy Day operation and return to
PRGM mode. Press RUN to exit.
• TEMPERATUREOVERRIDE—Press
or
untilthe
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 automati-
cally revert to the program.
• HOLD TEMPERATURE — The thermostat can hold any
temperature within its range for an indefinite period without
reverting to the programmed temperature. Momentarily
pressHOLDbutton."HOLD"willbedisplayed.Thenchoose
5
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Entering Your Program
PROGRAMMING YOUR THERMOSTAT
Follow these steps to enter the heating and cooling programs
you have selected.
This section will help you plan your thermostat’s program to
meetyourneeds.Formaximumcomfortandefficiency,keepthe
following guidelines in mind when planning your program.
Set Current Time and Day
• When heating (cooling) your building, program the tem-
peratures to be cooler (warmer) when the building is vacant 1. PressTIMEbuttononce. Thedisplaywillshowthehouronly.
or during periods of low activity.
• During early morning hours, the need for cooling is usually
minimal.
PM
EXAMPLE:
2. Press and hold either
or
until you reach the correct
Planning Your Program
hour and AM/PM designation (AM begins at midnight; PM
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.
begins at noon).
3. Press TIME once. The display window will show the minutes
only.
If you want to change the preprogrammed times and tempera-
tures, follow these steps.
EXAMPLE:
Determine the time periods and temperatures for your week-
day and weekend programs. You must program four periods
foreachdayprogram. However, youmayusethesameheating
and cooling temperatures for consecutive time periods. You
can choose start times, heating temperatures, and cooling
temperatures independently for each day programs (for ex-
ample, you may select 5:00 AM and 70° as the Monday 1st
period heating start time and temperature, and also choose
7:00 AM and 76° as the Monday 1st period cooling start time
and temperature).
4. Press and hold either
minutes.
or
until you reach the correct
5. Press TIME once. The display will show the day of the week.
6. Press or untilyoureachthecurrentdayoftheweek.
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.
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.
2. Press PRGM once. “MO” (indicating Monday 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).
SAMPLE
MO
Heating/Cooling Schedule Plan (Factory Program)
AM
EXAMPLE:
ALL DAYS OF THE WEEK
Start Time
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
Temperature
70° F
This display window shows that for Monday's 1st heating
period, the start time is 6:00 AM, and 70° is the programmed
temperature(thisexamplereflectsfactorypreprogramming).
Period
1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
62° F
3. Press
or
to change the displayed temperature to
70° F
yourselectedtemperatureforMonday's1stheatingprogram
period.
62° F
4. Press TIME once (the programmed time will flash). Press
78° F
or
until your selected start time for Monday's 1st
85° F
heating program period appears. The time will change in 15
minute increments. When your selected time is displayed,
pressTIMEagaintoreturntothechangetemperaturemode.
78° F
82° F
Heating/Cooling Schedule Plan
PERIOD 2
PERIOD 1
PERIOD 3
PERIOD 4
HEAT
Time Temp
COOL
Time Temp
HEAT
Time Temp
COOL
Time Temp
HEAT
Time Temp
COOL
Time Temp
HEAT
Time Temp
COOL
Time Temp
Mon
Tues
Wed
Thur
Fri
Sat
Sun
6
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5. Press PRGM once. The currently programmed start time
and setpoint temperature for the Monday's 2nd heating
program period will appear.
CHECK YOUR PROGRAMMING
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
6. Repeat steps 3 and 4 to select the start time and heating
temperature for Monday's 2nd heating program period.
1. Move SYSTEM switch to HEAT position.
2. PressPRGMtoviewthe1stMondayheatingperiodtimeand
temperature. Each time you press PRGM, the next heating
period time and temperature will be displayed in sequence
for Monday. Press HOLD to display Tuesday's 1st heating
period, and press PRGM to view each of the remaining
Tuesday's heating period time and temperatures. To view
ech day's heating program, press HOLD to change day and
them press PRGM to look at wach programming period for
the day. (You may change any time or temperature during
this procedure.)
7. Repeatsteps3through5forthe3rdand4thheatingprogram
periods. Monday heating programs are now complete.
NOTE
If you are programming your thermostat for thefirst time andyou
want programming for all days of the week to be the same as
Monday's program, press RUN or HOLD at this point, and
proceed to Enter Cooling Program. (This simplified COPY
DAY feature only works the first time you program your thermo-
stat. If you want to copy one day's programming to a specific day
programming, refer to COPY DAY FUNCTION in OPERATING
FEATURES. If you are changing your thermostat's program-
ming, you must program each day separately.)
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
8. Press HOLD once. “TU” (indicating Tuesday program) will
begin program operation.
appear in the display, along with the start time for the 1st
heating period and the currently programmed temperature. YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND
READY TO PROVIDE MAXIMUM COMFORT AND EFFICIENCY!
9. Repeat steps 3 through 7 to complete Tuesday's heating
programming.
10.Continue entering each day's programming until all heating
periods time and temperatures have been entered.
11.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 cooling program,
using your selected cooling times and temperatures.
TROUBLESHOOTING
Batteries
Reset Operation
For optimum performance, we recommend replacing batteries
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo-
once a year with fresh "AA" Energizer® alkaline batteries.
stat 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 ser-
vice person or place of purchase.
7
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TROUBLESHOOTING (cont.)
Symptom
o Heat/No Cool/No Fan
(common problems)
Possible Cause
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
N
3. Furnace blower compartment door or
panel loose or not properly installed.
Replace door panel in proper position to engage
safety interlock or door switch.
No Heat
1. Pilot light not lit.
Re-light pilot.
2. SYSTEM Switch not set to HEAT.
Set SYSTEM Switch to HEAT and raise setpoint
above room temperature.
3. Loose connection to thermostat or system.
4. Furnace Lock-Out Condition. Heat may also
be intermittent.
Verify thermostat and system wires are securelyAttached.
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.
5. Heating System requires service or
thermostat requires replacement.
Diagonistic: 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.
Set SYSTEM Switch to COOL and lower setpoint below
room temperature.
2. Loose connection to thermostat or system.
3. Cooling System requires service or thermostat
requires replacement.
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. FAN Switch set to Fan ON.
2. Possible short in wiring.
3. Possible short in thermostat.
4. 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. 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 can influence the cycle rate.
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
additionalsuggestions.
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1. The location of the thermostat and/or the size of the
Cooling System may be influencing thecycle rate.
The cycle rate for cooling is fixed and can not be adjusted.
Contact a local service person for suggestions.
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.
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