White Rodgers 1F87 251 Thermostat User Manual

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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

www.white-rodgers.com

PART NO. 37-6417C

Replaces 37-6417B

0441

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

thermostathasawallmountingplate,removethethermostat

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.

Mounting

holes

ATTENTION!

Electric/Gas

switch

This product does not contain mercury. However, this product

may replace a unit which contains mercury.

Mounting

holes

Do not open mercury cells. If a cell becomes damaged, do not

touch any spilled mercury. Wearing nonabsorbent gloves, take

upthespilledmercurywithsandorotherabsorbentmaterialand

place into a container which can be sealed. If a cell becomes

damaged, the unit should be discarded.

Figure 1. Thermostat Base

6. Push excess wire into wall and plug hole with a fire-resistant

material(suchasfiberglassinsulation)topreventdraftsfrom

affecting thermostat operation.

Mercury must not be discarded in household trash. When the

unit this product is replacing is to be discarded, place in a

suitablecontainerandreturntoWhite-Rodgersat2895Harrison

Street, Batesville, AR, 72501-2117 for proper disposal.

BATTERY LOCATION

ELECTRIC HEAT OR SINGLE-STAGE

HEAT PUMP SYSTEMS

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.

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 ELECTRIC/GAS

switch on the back of the thermostat (see fig. 1) and switch it to

the ELECTRIC position. This will allow the thermostat to ener-

gize 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.

If "LO BATT" is displayed, the batteries are low and should be

replaced with fresh "AA" Energizer^®alkaline batteries. To re-

place 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

heatingsystem.Ifyouhaveahydronicheatingsystem(asystem

that heats with hot water or steam), you must set the thermostat

tooperate properly with your system. Changethe second option

in the configuration menu to SL (see CONFIGURATIONMENU,

ATTACH THERMOSTAT BASE TO WALL

1. Remove the packing material from the thermostat. Gently page 4).

pull the cover straight off the base. Forcing or prying on the

thermostatwillcausedamagetotheunit. Ifnecessary, move

CHECK THERMOSTAT OPERATION

the electric heat switch (see ELECTRIC HEAT SYSTEMS,

above).

If at any time during testing your system does not operate

properly, contact a qualified service person.

2. Connect wires beneath terminal screws on base using

appropriate wiring schematic (see figs. 2 through 7).

Turn on power to the system.

3. Place base over hole in wall and mark mounting hole

locations on wall using base as a template.

Fan Operation

4. Move base out of the way. Drill mounting holes.

If your system does not have a G terminal connection, skip to

Heating System.

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.

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.

JUMPER

WIRE

THERMOSTAT

SYSTEM

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

SYSTEM

JUMPER

WIRE

JUMPER

WIRE

Cooling

System

Fan

Relay

THERMOSTAT

SYSTEM

Hot

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

RC RH

THERMOSTAT

SYSTEM

RC RH

Cooling

System

Fan

Relay

Heating

System

Reversing Compressor Fan

Valve*

Contactor Relay

Hot

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.

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.

The Thermostat Buttons and Switches

FAN

SYSTEM

TIME

PRGM

RUN

HOLD

Raises temperature setting.

Lowers temperature setting.

ON AUTO COOL OFF HEAT

Fltr

TIME button.

PRGM (program) button.

MO TU WE TH FR

SA SU

RUN (run program) button.

HOLD temperature button.

FAN switch (ON, AUTO).

FLTR

HOLD

BATT

15 12

13 12 11 10

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

Indicates day of the week.

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.

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.

Displays currently programmed set temperature (this is

blank when SYSTEM switch is in the OFF position).

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.

Configuration Menu

Step

Press Button(s)

Displayed (Factory Default) Press

to select:

COMMENTS

Select FA or SL (Fast or Slow) heating cycle rate

PRGM

and RUN

(FA)

d-L

(ON)

HOLD

OFF

Select display backlight OFF or ON

(ON)

Select Energy Management Recovery OFF or ON

HOLD

Filter

(000)

0 to 1950 hours

(in 50 hour increments)

Select filter replacement run time

HOLD

RUN

LOC

(OFF)

Select Compressor lockout OFF or ON

Select temperature display adjustment higher or lower

0 HI

(0)

4 LO to

4 HI

Select temperature display to F or C

Returns to normal operation

(F)

* 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

. 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

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

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.

EXAMPLE:

2. Press and hold either

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.

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

Heating/Cooling Schedule Plan (Factory Program)

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

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

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

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.

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.

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 cyclerate.

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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