White Rodgers 1F72 Thermostat User Manual

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CONTENTS

Installation Instructions for

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

Heating & Air Conditioning

1F72

5/2 Day Programmable

Heat Pump Thermostat

YOUR THERMOSTAT REPLACES

PREPARATIONS

Assemble tools required as shown below.

Description

Heat Pump (No Aux or Emergency Heat)

Heat Pump (with Aux or Emergency Heat)

Standard Heat & Cooling Systems

Standard Heat Only Systems

Yes

FLAT BLADE SCREWDRIVER

WIRE CUTTER/STRIPPER

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED

Millivolt Heat Only Systems – Floor or Wall Furnaces

Standard Central Air Conditioning

Gas or Oil Heat

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

Electric Furnace

Failure to follow and read all instructions carefully

before installing or operating this control could cause

personal injury and/or property damage.

Hydronic (Hot Water) Zone Heat – 2 Wires

Hydronic (Hot Water) Zone Heat – 3 Wires

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

CAUTION

Mounting

hole

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.

b. The base, which is removed by loosening all captive screws.

O/B

c. The switching subbase, which is removed by unscrewing

themountingscrewsthatholditonthewalloradaptorplate.

Terminal

Switches

Selection

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, removewallplatefromthewall.Iftheoldthermostat

has a wall mounting plate, remove the thermostat and the wall

mounting plate as an assembly.

W906 for Emergency

Heat Second Stage

Fan Control

W903

Clip to

Disable Celsius

EMR

W904

Clip for

Mounting

hole

W905

Clip for

Slow Cycle

4. Identifyeachwireattachedtotheoldthermostatusingthe

labels enclosed with the new thermostat.

Feature

Figure 1. Thermostat base

5. Disconnectthewiresfromtheoldthermostatoneatatime.DO

NOT LET WIRES FALL BACK INTO THE WALL.

6. Install new thermostat using the following procedures.

WHITE-RODGERS

EMERSON ELECTRIC CO

ST. LOUIS, MISSOURI

PART NO. 37-6498A

Printed in U.S.A.

www.white-rodgers.com

0342

O/B Terminal Switch Selection

REMOVING OLD THERMOSTAT

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.

CONTINUED FROM FIRST PAGE

ATTENTION! This product does not contain mercury. How-

ever, 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

container and return to White-Rodgers at 2895 Harrison Street,

Batesville, AR 72501-2117 for proper disposal.

CAUTION

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

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.

WARNING

2. Connect wires beneath terminal screws on base using appro-

priate wiring schematic (see figs. 2 through 4).

Do not use on circuits exceeding specified voltage.

Higher voltage will damage control and could cause

shock or fire hazard.

3. Placebaseoverholeinwallandmarkmountingholelocations

on wall using base as a template.

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.

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 appear-

ance 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.

Thermostat installation and all components of the sys-

tem shall conform to Class II circuits per NEC code.

Electric/Gas Jumper (Fan Option)

Ifyouremergencyorauxiliarysystemwillenergizetheblower,then

jumper W906 on the thermostat base must be cut (see fig. 1).

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.

If your emergency or auxiliary heat system requires that the

thermostat energize the fan circuit, do not cut jumper W906.

Battery Location

Thisthermostatdoesnotrequirebatteriestooperate.The2“AAA”

alkaline batteries are for the thermostat to remember the pro-

gramming if AC voltage is lost. If the display shows BATT when

AC power is not present, the batteries are low and should be

replaced with fresh “AAA” Energizer^®alkaline batteries. To re-

place 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.

If you are unsure of your application, contact a qualified service

person.

°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.

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).

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MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

THERMOSTAT

SYSTEM

O/B

See Note **

SYSTEM

MONITOR

SWITCH

Changeover

Relay*

Fan

Relay

Emergency

Relay

Aux

Relay

Compressor

Contactor

(Stage 2)

Hot

24 VAC

120 VAC

Neutral

* 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

TRANSFORMER

(Class II)

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

Figure 2. Typical wiring diagram for single transformer systems

NOTE

If safety circuits are in only one of the systems, remove

the transformer of the system with NO safety circuits.

THERMOSTAT

SYSTEM

O/B

CUT AND

TAPE OFF!

SYSTEM

MONITOR

SWITCH

See Note **

Changeover

Relay*

Fan

Relay

Limit or

Safety

Switches

Emergency

Relay

HOT

120 VAC

NEUTRAL

24 VAC

Aux

Relay

(Stage 2)

Compressor

Contactor

Hot

24 VAC

120 VAC

Neutral

TWO COMMONS MUST

BE JUMPERED TOGETHER!

TRANSFORMER

(Class II)

* 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

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits

NOTE

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.

THERMOSTAT

O/B

SYSTEM

Limit or

Safety

Limit or

Safety

See Note **

HOT

Switches

24 VAC

120 VAC

Switches

SYSTEM

MONITOR

SWITCH

Changeover

Relay*

Fan

Relay

NEUTRAL

Emergency

Relay

24 VAC

Auxiliary

Heating

NOTE

ACCESSORY

RELAY N.O.

CONTACT

Aux

Relay

(Stage 2)

Transformer

(Class II)

The accessory relay scheme

is required when safety

circuits exist in both systems.

Compressor

Contactor

COMMON

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Limit or

Safety

Switches

Safety

HOT

Switches

24 VAC

120 VAC

* 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

COMMON

NEUTRAL

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

Heat Pump Transformer

(Class II)

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

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Cooling System

1. Move SYSTEM switch to COOL position.

CHECK THERMOSTAT OPERATION

2. Press

ture. The blower should come on immediately on high speed,

followed by cold air circulation.

3. Press to adjust temperature setting above room tem-

to adjust thermostat setting below room tempera-

NOTE

To prevent static discharge problems, touch side of ther-

mostattoreleasestaticbuild-upbeforetouchinganykeys.

perature. The cooling system should stop operating.

If at any time during testing your system does not operate

properly, contact a qualified serviceperson.

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.

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.

The Thermostat Buttons and Switches

3. Move fan switch to AUTO position. The blower should stop

immediately.

(Up arrow) Raises temperature setting.

(Down arrow) Lowers temperature setting.

CAUTION

TIME button.

Do not allow the compressor to run unless the compres-

sor oil heaters have been operational for 6 hours and the

system has not been operational for at least 5 minutes.

PRGM (program) button.

RUN (program) button.

HOLD button.

Heating System

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT, EMER).

1. Move SYSTEM switch to HEAT position. If the auxiliary

heating system has a standing pilot, be sure to light it.

2. Press

to adjust thermostat setting to 1° above room

The Display

Indicates day of the week.

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.)

Indicates a malfunction with the system.

3. Adjusttemperaturesettingto4° aboveroomtemperature.The

auxiliary heat system should begin to operate and the Flame

icon ( ) will be flashing.

Flame icon ( ) is displayed when the SYSTEM switch is in

theHEATposition.Flameicon( )isdisplayedflashingwhen

2nd-stage heat (Aux or Emergency) is energized. Snow-

flakeicon( )isdisplayed(non-flashing)whentheSYSTEM

switch is in the COOL position. Snowflake and Flame icon

willbedisplayed(flashing)ifthethermostatisinlockoutmode

to prevent the compressor from cycling too quickly.

4. Press

to adjust thermostat setting below room tempera-

ture. The heating system should stop operating.

Emergency System

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

toadjustthermostatsettingaboveroomtempera-

ture. The Aux heating system will begin to operate. The

Flame icon ( ) will display flashing to indicate that the Aux

system is operating.

3. Press

to adjust the thermostat below room temperature.

The Aux heating system should stop operating.

CAUTION

To prevent compressor and/or property damage, if the

outdoor temperature is below 50°F, DO NOT operate the

cooling system

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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.

CHECK THERMOSTAT OPERATION

CONTINUED FROM FOURTH PAGE

EMER is displayed flashing when the system switch is in

EMER position.

Alternately displays current time and temperature.

4. SelectBacklitDisplay–(Notavailableonearliermodels)The

display backlight improves display contrast in low lighting

conditions. Selecting backlight ON will keep the light on

The word HOLD is displayed when the thermostat is in the

HOLD mode.

continuously. Selecting Backlight OFF will keep the light off.

Displayscurrentlyprogrammedsettemperature(thisisblank

when SYSTEM switch is in the OFF position).

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.

“BATT” is displayed when 2 “AAA” batteries are low and

should be replaced.

• SIMULTANEOUSHEATING/COOLINGPROGRAMSTOR-

AGE—Whenprogramming, youcanenterbothyourheating

and cooling programs at the same time. There is no need to

reprogram the thermostat at the beginning of each season.

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.

• TEMPERATUREOVERRIDE—Press

untilthe

display shows the temperature you want. The thermostat will

override current programming and keep the room tempera-

tureattheselectedtemperatureuntilthenextprogramperiod

begins. Then the thermostat will automatically revert to the

program.

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.

• HOLD TEMPERATURE — The thermostat can hold any

temperature 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

. The thermostat will

hold the room temperature at the selected setting until you

press the RUN button to start program operation again.

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

TEMPERATURE 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

temperatureis1°Formoreaboveactualtemperatureformore

than ten minutes.

• ENERGYMANAGEMENTRECOVERY—EnergyManage-

mentRecovery(EMR)causesthethermostattostartheating

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.

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.

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.

• °F/°C CONVERTIBILITY — The factory default setting is

Fahrenheit. Clipping W904 jumper on the circuit board (see

fig. 1) will alter this feature to Celsius temperature setting.

Configuration Menu

Step

Press Button(s)

Displayed (Factory Default) Press

to select:

COMMENTS

PRGM

and RUN

(on)

OFF

Select Fast (on) or slow (off) Second Stage Heat

(OFF)

Select Compressor lockout OFF or ON

HOLD*

3 LO TO

3 HI

0 HI

(0)

Select temperature display adjustment higher or lower

(ON)

Select display backlight OFF or ON

Returns to normal operation

OFF

HOLD**

RUN

* Not available on earlier models

** Press HOLD to advance to next item or TIME to move backwards to previous item

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3. Press TIME once. The display window will show the minutes

only.

PROGRAMMINGYOUR 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.

• When heating (cooling) your building, program the tempera-

tures to be cooler (warmer) when the building is vacant or

during periods of low activity.

EXAMPLE:

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.

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

minimal.

7. Press RUN once. The display will show the correct time and

room temperature alternately.

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 tempera-

tures, follow these steps.

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).

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 week-

end 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 weekday1st period cooling

start time and temperature). Use the table at the bottom of the

pagetoplanyourprogramtimeperiodsandthetemperaturesyou

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.

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 tempera-

ture (this example reflects factory preprogramming).

3. Press

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

until your selected time appears. The time will

Entering Your Program

change in 15 minute increments. When your selected time is

displayed, press TIME again to return to the change tempera-

ture mode.

Follow these steps to enter the heating and cooling programs you

have selected.

5. Press PRGM once. The currently programmed start time and

setpoint temperature for the 2nd heating program period will

appear.

Set Current Time and Day

1. Press TIME button once. The display will show the hour only.

6. Repeat steps 4 and 5 to select the start time and heating

temperature for the 2nd heating program period.

EXAMPLE:

7. Repeat steps 4 through 6 for the 3rd and 4th heating program

periods. Weekday heating programs are now complete.

2. Press and hold either

until you reach the correct

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.

hour and AM/PM designation (AM begins at midnight; PM

begins at noon).

SAMPLE

Heating/Cooling Schedule Plan

Heating/Cooling Schedule Plan (Factory Program)

WEEKEND (2 DAY)

WEEKDAY (5 DAY)

Start

Period

Time

Temperature

70 F

Time

Temperature

70 F

Period

Time

Temperature

Time

Temperature

1ST

6:00 AM

2ND

3RD

4TH

1ST

2ND

3RD

4TH

2ND

3RD

4TH

1ST

2ND

3RD

4TH

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

62 F

70 F

62 F

78 F

85 F

78 F

82 F

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

62 F

70 F

62 F

78 F

85 F

78 F

82 F

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Check Your Programming

PROGRAMMINGYOUR THERMOSTAT

Follow these steps to check your thermostat programming one

final time before beginning thermostat operation.

1. Move SYSTEM switch to HEAT position.

CONTINUED FROM SIXTH PAGE

9. Repeat steps 4 through 8 to complete weekend heating

programming.

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).

10.When you have completed entering your heating program,

press RUN.

Enter Cooling Program

3. Press RUN.

Iftheoutsidetemperatureisbelow50°F, disconnectpowerto

the cooling system before programming. Energizing the air

conditioner compressor during cold weather may cause

personal injury or property damage.

4. Move SYSTEM switch to COOL position.

5. Repeat step 2 to check cooling temperatures.

6. Press RUN to begin program operation.

1. Move SYSTEM switch to COOL position.

YOURTHERMOSTATISNOWCOMPLETELYPROGRAMMED

AND READY TO AUTOMATICALLY PROVIDE MAXIMUM

COMFORT AND EFFICIENCY!

2. Followtheprocedureforenteringyourheatingprogram, using

your selected cooling times and temperatures.

SPECIFICATIONS

ELECTRICAL DATA

THERMAL DATA

Electrical Rating:

Setpoint Temperature Range:

45°F to 90°F (7°C to 32°C)

Operating Ambient Temperature Range:

32°F to 105°F

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)

Operating Humidity Range:

0 to 90% RH (non-condensing)

Shipping Temperature Range:

-40°F to 150°F

TROUBLESHOOTING

Reset Operation

reset and still does not function correctly contact your heating/

cooling service person or place of purchase.

If a voltage spike or static discharge blanks out the display or

causes erratic thermostat operation you can reset the thermostat

Batteries

by pressing

and TIME at the same time. This also

For optimum performance, we recommend replacing batteries

resets the factory defaults. If the thermostat has power, has been

once a year with fresh “AAA” Energizer alkaline batteries.

Symptom

Possible Cause

Corrective Action

No Heat/No Cool/No Fan

(common problems)

1. Blown fuse or tripped circuit breaker.

2. Furnace power switch to OFF.

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.

Verify thermostat and system wires are securely

attached.

4. Furnace Lock-Out Condition. Heat may also

be intermittent.

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.

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TROUBLESHOOTING

CONTINUED FROM SEVENTH PAGE

Symptom

Possible Cause

Corrective Action

No Heat (continued)

5. Heating system requires service or

thermostat requires replacement.

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 thermo-

stat 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.

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.

Verify thermostat and system wires are securely

attached.

3. Cooling system requires service or

thermostat requires replacement.

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.

Heat, Cool or Fan Runs Constantly.

1. Possible short in wiring.

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

2. Possible short in thermostat.

3. Possible short in heat/cool/fan system.

4. Fan Switch set to Fan On.

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 (Air Conditioning) Cycles Too Fast

or Too Slow (narrow or wide temperature

swing)

1. The location of the thermostat and/or the

size of the Heating (Cooling) System may

be influencing the cycle rate.

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 Setting and Thermostat

Thermometer Disagree

1. Thermostat thermometer setting requires

adjustment.

The thermometer can be adjusted +/- 3 degrees.

See Temperature Display Adjustment in the

Operation section.

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 a static discharge

occurs use the Reset Operation listed above.

Blank Display and/or Keypad

Not Responding

1. Voltage spike or static discharge.

Use the Reset Operation listed above.