Emerson P210 User Manual

Single-Stage Thermostat

with scheduling

Install Guide

Want to install the easy way?

Model # P210
Made in China

37-7578

2

WARNING

!

GUIDE CONTENTS

Preparations ................................................. 3

Thermostat details ........................................ 4

Removal of your old thermostat.................... 5

Mounting and wiring your new thermostat .. 10

Checking thermostat operation................... 12

Programming your thermostat .................... 16

Specifications ............................................. 33

Troubleshooting .......................................... 35

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury
and/or property damage.

1. PREPARATIONS

1.1 Check package contents

This package should contain the following items:

• Thermostat

• Mounting screws and wall anchors (x2)

• 2 AAA batteries

• Terminal wire label stickers

• Installation instructions

1.2 Gather tools

Required tools:

□ Flat-head Screwdriver □ Small pliers (needle-nose) □ Drill with 3/16” (4 mm) bit

Optional tools:

□ Wire cutters/stripper □ Hammer

3

2. THERMOSTAT DETAILS

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The thermostat buttons and switches

1

Raises temperature setting.

2

Lowers temperature setting.

3

TIME button.

4

PRGM (program) button.

5

RUN (run program) button.

6

HOLD temperature button.

7

FAN switch (ON, AUTO).

8

SYSTEM switch

(COOL, OFF, HEAT).

4

Time Prgm Run Hold

Fltr

3

4

5

6

Fan

System

On Auto Cool Off Heat

7

8

1

2

3. REMOVING OLD THERMOSTAT

WARNING

!

3.1 Turn off power

or

To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker box, or by flipping
a switch at the air handler. Do not restore power until installation is complete.

To ensure the power to your heating and cooling system has been turned off, try to turn on heating or cooling by

changing the temperature on your old thermostat.

5

3.2 Remove the old thermostat cover

CAUTION

!

Remove the old thermostat’s front cover from the wall base. Some covers pull off easily, while others may need to
be removed by prying the cover off with a screwdriver.

Your old thermostat may have a sealed glass tube containing mercury. Be careful not to damage the tube or dispose of the tube in your trash.
For safe disposal information, please see Mercury Notice on page 43.

3.3 Label wires

Tip: Taking a picture with a camera or smartphone can help you not only remember how wires are connected

to the terminals, but can also ensure that you label your wires correctly.

Using your screwdriver, carefully unscrew one wire at a time from the terminal block and attach the corresponding

wire label sticker.

Please note that not all terminals may be used, and that there’s no standard color code for thermostat wires, so
your wire colors may vary. For your reference, we’ve included a terminal label reference chart on page 7 to help you

connect the wires in your old thermostat to your new thermostat in case you get stuck.

6

Terminal labeling reference chart

If your current terminal has

the following letter

Label the wires with the

following letters

Terminal function

RH, R, R5, 5 RH 24V Power (Heating)

RC RC 24V Power (Cooling)

W, W1, 4 W Heating Relay

Y, Y1 Y Cooling Relay

G G Fan Relay

O O

B B

Reversing Valve (for heat pump applications

energized in Cool mode)

Reversing Valve (for heat pump applications

energized in Heat mode)

7

3.4 Identify jumper wire

On your old thermostat, if… Then, on your new thermostat…

Terminal RC and RH are connected

with a jumper wire

There’s only one R wire (RC, RH, R or R5)

coming out of the wall

Terminal RC and RH (or 5 or R5) are NOT

connected by a jumper wire

Leave the jumper wire in its place

Leave the jumper wire in its place

Remove the jumper wire between RC and RH

For terminal Y and W:

If you have a heat pump with reversing valve, connect Y and W with a jumper wire on your new thermostat.

If you need help with labeling and wiring, please contact Customer Support at 877.654.9394 or email
[e-mail] — we’re here to help!

8

3.5 Remove old thermostat base

With all of your wires disconnected and properly labeled, you may now safely remove the thermostat base from
your wall.

Tip: Worried about having your wires falling into your wall? Keep the wires secure by wrapping the them

around a pencil.

9

4. MOUNTING AND WIRING YOUR NEW THERMOSTAT

4.1 Install new thermostat base

Mount your new thermostat base using the supplied screws. Drill holes and insert wall anchors to secure the
thermostat base to the wall, if necessary.

10

4.2 Connect wires to corresponding terminal blocks

CAUTION

!

Match each labeled wire to it’s corresponding terminal on the mounted thermostat base. Insert each labeled wire into
the hole of it’s matching terminal, and using the screwdriver, tighten the screw on the terminal block securely.

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.

4.3 Set switch and advanced wiring

If you have either a gas or oil furnace, set the switch to GAS.

If you have an electric furnace, set the switch to ELEC.

Electric / Gas
switch

11

4.4 Install the batteries and attach front cover

Install the included AAA alkaline batteries and push the front cover on to the thermostat base until it’s secure.

4.5 Turn on power

Turn on your power at the source.

Congratulations! You’ve completed the thermostat installation process

5. CHECK THERMOSTAT OPERATION

Tip: If at any time during testing your system does not operate properly, please contact Customer Support at

877.654.9394 or email [e-mail]

5.1 Fan operation

If your system does not have a G terminal connection, skip to 5.2 Heating system.

1. Move FAN switch to ON position. The blower should begin to operate.

2. Move FAN switch to AUTO position. The blower should stop immediately.

12

5.2 Heating system

CAUTION

!

1. Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2. Press  to adjust thermostat setting room temperature. The heating system should begin to operate.

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

5.3 Cooling system

To prevent compressor and/or property damage, if the outdoor temperature is below 50°, DO NOT operate the cooling system

1. Move SYSTEM switch to COOL position.

2. Press  to adjust thermostat setting below room temperature. The blower should come on immediately on high

speed, followed by bold air circulation.

3. Press  to adjust temperature setting above room temperature. The cooling system should stop operating.

13

5.4 Typical wiring diagrams

Typical wiring diagram for heat/cool,

5-wire, two-transformer systems

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

HEATING

TRANSFORMER

Heating
System

Fan

Relay

Cooling
System

RC

24 VAC

120 VAC

Hot

Neutral

COOLING TRANSFORMER

OBC

‡

‡

For 2-wire Heat only,
attach to RH and W

14

YC

G W

OB

Heating

Fan

System

Relay

NOTE

Typical wiring diagram for heat only,

3-wire, single transformer systems

JUMPER

RC

WIRE

RH

24 VAC

THERMOSTAT

SYSTEM

TRANSFORMER

Hot

120 VAC

Neutral

‡

Y

OBC

Cooling
System

Typical wiring diagram for heat/cool,

5-wire, two-transformer systems

G W

Fan

Relay

RC

Heating

24 VAC

System

24 VAC

COOLING TRANSFORMER

THERMOSTAT

RH

SYSTEM

HEATING

TRANSFORMER

Hot

120 VAC

Neutral

Hot

120 VAC

Neutral

Typical wiring diagram for heat only,

3-wire, single transformer systems

24 VAC

120 VAC

Hot

Neutral

SYSTEM

TRANSFORMER

Heating
System

Fan

Relay

For 2-wire Heat only,
attach to RH and W

NOTE

Typical wiring diagram for heat/cool,

5-wire, two-transformer systems

HEATING

TRANSFORMER

24 VAC

120 VAC

Hot

Neutral

COOLING TRANSFORMER

Typical wiring diagram for heat pump

with reversing valve energized in COOL

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

TRANSFORMER

Reversing

Valve*

RCOBC

‡

JUMPER

WIRE

Compressor

Contactor

JUMPER

WIRE

* Reversing valve is energized when the
system switch is in the COOL position

Fan

Relay

Typical wiring diagram for heat/cool,

5-wire, two-transformer systems

HEATING

TRANSFORMER

24 VAC

120 VAC

Hot

Neutral

COOLING TRANSFORMER

Typical wiring diagram for cool only,
3-wire, single transformer systems

RH

Y

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

SYSTEM

G W

Cooling
System

Fan

Relay

RCOB

C

‡

Typical wiring diagram for heat pump

with reversing valve energized in COOL

RH

Y

24 VAC

120 VAC

Hot

Neutral

SYSTEM

G W

TRANSFORMER

Reversing

Valve*

RCOBC

‡

Compressor

Contactor

* Reversing valve is energized when the
system switch is in the COOL position

Fan

Relay

Typical wiring diagram for heat pump

with reversing valve energized in HEAT

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

TRANSFORMER

Reversing

Valve*

RCO

B

C

‡

JUMPER

WIRE

Compressor

Contactor

JUMPER

WIRE

* Reversing valve is energized when the
system switch is in the HEAT position

Fan

Relay

Typical wiring diagram for heat pump

with reversing valve energized in COOL

RH

Y

24 VAC

120 VAC

Hot

Neutral

SYSTEM

G W

TRANSFORMER

Reversing

Valve*

RCOBC

‡

Compressor

Contactor

* Reversing valve is energized when the
system switch is in the COOL position

Fan

Relay

C

‡

Y

Cooling
System

Typical wiring diagram for cool only,
3-wire, single transformer systems

G W

Fan

Relay

JUMPER

WIRE

RH

RCOB

24 VAC

TRANSFORMER

THERMOSTAT

SYSTEM

Hot

120 VAC

Neutral

‡

* Reversing valve is energized when the
system switch is in the COOL position

JUMPER

WIRE

Y

Contactor

Fan

Relay

G W

Reversing

Compressor

Valve*

Typical wiring diagram for heat pump

with reversing valve energized in COOL

JUMPER

WIRE

RH

RCOBC

24 VAC

THERMOSTAT

SYSTEM

TRANSFORMER

Hot

120 VAC

Neutral

RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.

NOTE

Y

Cooling
System

G W

Fan

Relay

Heating
System

OC‡B

Typical wiring diagram for heat/cool,

4-wire, single transformer systems

JUMPER

WIRE

RC

24 VAC

THERMOSTAT

RH

SYSTEM

TRANSFORMER

Hot

120 VAC

Neutral

JUMPER

Compressor

Contactor

Y

WIRE

Fan

Relay

‡

B

C

Reversing

Valve*

* Reversing valve is energized when the
system switch is in the HEAT position

Typical wiring diagram for heat pump

with reversing valve energized in HEAT

ǂ c-wire not required

G W

JUMPER

WIRE

RH

RCO

24 VAC

THERMOSTAT

SYSTEM

TRANSFORMER

Hot

120 VAC

Neutral

15

6. PROGRAMMING YOUR THERMOSTAT

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

6.1 The thermostat buttons and switches

1

Raises temperature setting.

2

Lowers temperature setting.

3

TIME button.

4

PRGM (program) button.

5

RUN (run program) button.

6

HOLD temperature button.

7

FAN switch (ON, AUTO).

8

SYSTEM switch (COOL, OFF, HEAT).

16

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2

Time Prgm Run Hold

Fltr

3

4

5

6

Fan

On Auto Cool Off Heat

7

System

8

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6.2 The display

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18

Indicates day of the week.

Flame icon () is displayed when the SYSTEM switch is in the HEAT position. Snowake
icon ()is displayed (non-flashing) when the SYSTEM switch is in the COOL position.

Snowake is displayed (flashing) if the thermostat is in lockout mode to prevent the
compressor from cycling too quickly.

Displays “CHANGE ” when the 2 "AAA" batteries are low and should be replaced.
Only “CHANGE ” and “LO” in the minutes eld are displayed when batteries are low
with no system power.

Alternately displays current time and temperature. Displays “LO” in the minutes eld when

batteries are low.

The word “HOLD” is displayed when the thermostat is in the HOLD mode. “HOLD” is

displayed flashing when the thermostat is in a temporary HOLD Mode.

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 programmed lter time period as a
reminder to change or clean your air lter.

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14

9

MO TU WE TH FR SA SU

11

AM
PM

10

10

12

FLTR HOLD CHANGE

15

13

14

19

6.3 Conguration menu

The conguration 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 conguration menu. The display will show the rst item in the conguration menu.

The conguration menu table summarizes the conguration 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 fteen minutes, the
thermostat will revert to normal operation.

1. Select Temporary Hold Time – The thermostat can hold any temperature you set it to for the amount of time

you select on this option. Your choices are 0:00 to 8:00 hours in 15 minute increments. 0:00 disables the func-

tion

Example:

1. You have selected 3:00 hours for the Temporary Hold time period.

2. With the thermostat set to Heat or Cool, press HOLD for approximately ve seconds until HOLD time (3:00
indicating 3 hours) appears as a setting reminder.

20

3. After releasing the button, “HOLD” on the display will blink.

4. Use  or  to set the temperature to your preference. The thermostat will maintain this temperature setting
for 3 hours with “HOLD” blinking to remind you it is in Temporary Hold. After 3 hours the thermostat will go

back to the program temperature and “HOLD” will no longer blink or display.

2. Select FA or SL (Fast or Slow) Heating Cycle Rate – The FA setting is frequently used for gas, oil or electric

heat. The SL setting produces a longer heating cycle which is normally for hot water or steam (hydronic) sys­tems. Both settings produce very accurate temperature control and can be set to your personal preference. FA
cycles the system just under 1°F and the SL setting cycles at approximately 1.5°F.

3. Select backlit display – The display backlight improves display contrast in low lighting conditions. Selecting

backlight ON will keep the light on for a short period of time after any key is pressed. Selecting OFF will keep the
light off.

4. Select Energy Management Recovery OFF or ON – Energy Management Recovery (EMR) causes the

thermostat to start heating or cooling early to make the building temperature reach the program setpoint at the

time you specify. Heating will start 5 minutes early 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.

21

5. Select lter replacement run time – The thermostat will display “FLTR” after a set time of operation. This is a
reminder to change or clean your air lter. This time can be set from 0 to 1950 hours in 50 hour increments. A
selection of 000 will cancel this feature. When “FLTR” is displayed, you can clear it by pressing HOLD and
RUN at the same time. This resets the timer and starts counting the hours until the next lter change. Changing

the time in the menu also resets the timer.

6. Select Compressor Lockout LOC OFF or ON – Selecting LOC ON will cause the thermostat to wait 5
minutes before turning on the compressor if the heating and cooling system loses power. It will also wait a

minimum of 5 minutes between cooling cycles. This is intended to help protect the compressor from short
cycling. Some newer compressors already have a time delay built in and do not require this feature. Your
compressor manufacturer can tell you if the feature is already present in their system. When the compressor
time delay occurs it will flash the (snowflake icon) for about ve minutes then turn on the compressor.

7. Select Temperature Display Adjustment 4 LO to 4 HI – Allows you to adjust the room temperature display

+/- 4°. Your thermostat was accurately calibrated at the factory but you have the option to change the display
temperature to match your previous thermostat.

8. Select F° or C° Readout – Changes the display readout to Celsius or Fahrenheit as required.

22

Configuration Menu

Step Press Button(s) Displayed (Factory Default) Press or to select: COMMENTS

1

2

3

4

5

6

7

8

9

* Press

PRGM

and RUN

*

HOLD

HOLD

*

HOLD

*

HOLD

*

HOLD

*

HOLD

*

HOLD

*

RUN

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

HOLD

(0:00)

(FA)

d-L

(ON)

E

(ON)

Filter
(000)

LOC

(OFF)

0 HI

(0)

(F) C

15 minute increments)

0 to 1950 hours

(in 50 hour increments)

0 to 8 hrs (in

SL

OFF

OFF

ON

4 LO to

4 HI

Select temporary Hold time

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

Select display backlight OFF or ON

Select Energy Management Recovery OFF or ON

Select filter replacement run time

Select compressor lockout OFF or ON

Select temperature display adjustment higher or lower

Select temperature display to F or C

Returns to normal operation

23

6.4 Operating features

This section contains information about the many features of your new 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  or  until the display shows your desired temperature.

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 temperature within its range for an indenite period
without reverting to the programmed temperature. To engage this feature, 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 RUN button to start program operation again.

• CONFIGURATION MENU — Allows you to customize certain thermostat options.

24

6.5 Programming your thermostat

This section will help you plan your thermostat’s program to meet your needs. For maximum comfort and efciency,

keep the following guidelines in mind when planning your program:

• When heating (cooling) your building, program the temperatures to be cooler (warmer) when the building is
vacant or during periods of low activity.

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

Planning your program

Look at the factory pre-programmed times and temperatures shown in the sample schedule. If this program will suit
your needs, simply press the RUN button to begin running the factory preset program.

If you want to change the pre-programmed 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).

25

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

COOL HEAT

Period

COOL HEAT

Heating/Cooling Schedule Plan (Factory Program)

WEEKDAY (5 DAY)

Period

Start
Time Temperature

1ST 6:00 AM 70°F 6:00 AM 70°F 6:00 AM 70°F

2ND 8:00 AM 62°F 8:00 AM 62°F 8:00 AM 62°F

3RD 5:00 PM 70°F 5:00 PM 70°F 5:00 PM 70°F

4TH 10:00 PM 62°F 10:00 PM 62°F 10:00 PM 62°F

1ST 6:00 AM 78°F 6:00 AM 78°F 6:00 AM 78°F

2ND 8:00 AM 85°F 8:00 AM 85°F 8:00 AM 85°F

3RD 5:00 PM 78°F 5:00 PM 78°F 5:00 PM 78°F

4TH 10:00 PM 82°F 10:00 PM 82°F 10:00 PM 82°F

26

SAMPLE

SATURDAY (1 DAY)

Start
Time Temperature

SUNDAY (1 DAY)

Start

Time Temperature

COOL 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.

Heating/Cooling Schedule Plan

Period

WEEKDAY (5 DAY)

Start
Time Temperature

SATURDAY (1 DAY)

Start
Time Temperature

SUNDAY (1 DAY)

Start
Time Temperature

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

27

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:

PM

2. Press and hold either  or  until you reach the correct hour and AM/PM designation

(AM begins at midnight; PM begins at noon).

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

EXAMPLE:

28

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.

Set Heating Program

1. Move the SYSTEM switch to HEAT.

2. Press PRGM once. “MO TU W 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).

EXAMPLE:

MO TU WE TH FR

AM

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

29

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 desired time appears. The time

will change in 15 minute increments. When your selected time is displayed, press TIME again to return to the

change temperature mode.

5. Press PRGM once. The currently programmed start time and setpoint temperature for the 2nd heating program

period will appear.

6. Repeat steps 3 and 4 to select the start time and heating temperature for the 2nd heating program period.

7. Repeat steps 3 through 5 for the 3rd and 4th heating program periods. Weekday heating programs are now

complete.

8. Press PRGM once. “SA” (indicating Saturday program) will appear in the display, along with the start time for
the 1st heating period and the currently programmed temperature.

9. Repeat steps 3 through 7 to complete Saturday heating programming.

10. Press PRGM once. “SU” (indicating Sunday program) will appear in the display, along with the start time for the
1st heating period and the currently programmed temperature.

11. Repeat steps 3 through 7 to complete Sunday heating programming.

30

12. When you have completed entering your heating program, press RUN.

CAUTION

!

Set 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. To set your cooling program, follow the same procedure as setting your heating program, but use your selected

cooling times and temperatures.

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Check your programming

Follow these steps to check your thermostat programming one nal time before beginning thermostat operation.

1. Move SYSTEM switch to HEAT position.

2. Press PRGM to view the 1st weekday heating period time and temperature. Each time you press PRGM, the
next heating period time and temperature will be displayed in sequence for weekday, then weekend program

periods (you may change any time or temperature during this procedure).

3. Press RUN.

4. Move SYSTEM switch to COOL position.

5. Repeat step 2 to check cooling program.

6. Move SYSTEM switch to HEAT or COOL and press RUN to begin program operation.

CONGRATULATIONS! Your new thermostat is now programmed.

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7. SPECIFICATIONS

ELECTRICAL DATA

Electrical Rating:

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)

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 149°F

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APPLICATIONS
For use with:

• Standard heat/cool or heat only systems

• Electric heat systems

• Gas or oil red 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

DO NOT USE WITH:

• Multi-stage systems

• Systems exceeding 30 VAC and 1.5 amps

• 3-wire zoned hydronic heating systems

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8. TROUBLESHOOTING

Reset Operation

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the
thermostat by pressing , ,  and TIME at the same time. This also resets the factory defaults to the congura­tion 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.

Batteries

For optimum performance, we recommend replacing batteries once a year with fresh "AAA" alkaline batteries.

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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.

3. Furnace blower compartment door or

panel loose or not properly installed.

Replace fuse or reset breaker.

Turn switch to ON.

Replace door panel in proper position to
engage safety interlock or door switch.

No Cool 1. SYSTEM Switch not set to Cool.

2. Loose connection to thermostat or
system.

3. Cooling system requires service or

thermostat requires replacement.

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Set SYSTEM Switch to COOL and

lower setpoint temperature 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 ve minute delay before the

thermostat clicks in Cooling.

Symptom Possible Cause Corrective Action

No Heat 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.

5. Heating system requires
service or thermostat requires

replacement..

Re-light pilot.

Set SYSTEM Switch to HEAT and raise setpoint temperature
above room temperature.

Verify thermostat and system wires are securely attached.

Many furnaces have safety devices that shutdown when a
lock-out condition occurs. If the heat works intermittently
contact the furnace manufacturer or local service person for

assistance.

Diagnostic: Set SYSTEM Switch to HEAT and raise the
setpoint above room temperature. Within a few seconds

the thermostat should make a soft click sound. This sound
usually indicates the thermostat is operating properly. If the

thermostat does not click, try the reset operation listed below.

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.

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Symptom Possible Cause Corrective Action

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 sys-

tem 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)

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

Item 2 in the Conguration Menu is the

adjustment that controls the cycle rate. If

an acceptable cycle rate is not achieved
using the FA (Fast) or SL (Slow) adjust­ment contact a local service person for

additional suggestions.

Symptom Possible Cause Corrective Action

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 the cycle rate.

The cycle rate for cooling is xed 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 Con­guration 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 Conguration Menu (Item 4).

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Symptom Possible Cause Corrective Action

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 desig-

nations 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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CONTACT US

Customer support: 877.654.9394 or [e-mail]

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MERCURY NOTICE

This product does not contain mercury. However, this product may replace a product

that contains mercury.

Mercury and products containing mercury must not be discarded in household trash.

Refer to thermostat-recycle.org for location to send product containing mercury.

FOR CALIFORNIA RESIDENTS

Warning: This product contains a chemical known to the state of California to cause
cancer and birth defects and other reproductive harm.

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