Lennox 11U61 Setup And Installation Manual

201 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER

FOR FUTURE REFERENCE

NOTICE

Read this manual before programming this thermostat.

Use this thermostat only as described in this manual.

WARNING

Improper installation, adjustment, alteration, service or maintenance
can cause property damage, personal injury or loss of life.

Installation and service must be performed by a licensed professional
HVAC installer (or equivalent) or service agency.

INSTALLER'S SYSTEM SETUP
GUIDE

iComfort Wi-Fi® Flex

Touchscreen Programmable Thermostat (11U61)

CONTROLS

Shipping and Packing List

Thermostat container includes:
1 - Thermostat
4 - Wall anchors
1 - Homeowner's manual
4 - Mounting screws

Equipment Interface container includes:
1 - Equipment Interface Module
1 - Equipment Interface Module Installation Instruction
1 - Warranty card

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TABLE OF CONTENTS

Overview - Technical Description and Features 2................

Installation and set up 3.....................................

Adjusting System Settings 4..................................

Connecting to Home Wi-Fi Router 6...........................

Troubleshooting Wi-Fi Connection 9...........................

Account Registration 14......................................

Firmware Update 15.........................................

Adding Conventional Outdoor Unit and Accessories 15............

Outdoor Unit (Air Conditioner or Heat Pump) 15...................

Bypass (24VAC) Humidifier 15..................................

Auxiliary Dehumidifier 16......................................

Adjusting Humidification and Dehumidification Settings with

Conventional Outdoor Units 17................................

Using the Tests / Diagnostics Features 20.......................

Using the Secure Web Portal 22...............................

Skins 22...................................................

Screen-Saver 22............................................

Accessing Installer Screens and Changing

Equipment Parameters 24....................................

Wiring Diagrams 26..........................................

Overview - Technical Description and Features

The iComfort Wi‐Fi® Flex Thermostat is a 24VAC, color
display touchscreen and 7-day programmable
thermostat. It stores system parameters and settings in
non-volatile memory (i.e., it retains data when electrical
power fails or is turned off).

The iComfort Wi‐Fi® Flex thermostat can connect to
online services via the Internet through the homeowner's
Wi-Fi access point. After online registration is
completed, the system may then be accessed by the
homeowner from anywhere using a remote Internet
connection via computer, smartphone or other personal
Internet-connected devices.

WARNING

This is a 24VAC Class 2 thermostat. Do not install on voltages higher
than 30VAC.

Do not switch system to cool if the outdoor temperature is below 45°F
(7°C). This can damage the cooling system.

WARNING

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7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

3

This thermostat supports:
 Wireless bands 802.11b, 802.11g and 802.11n

 Three languages (English, French, Spanish)

 Air conditioning or heat pump units with up to four

stages of heat / two stages of compressor operation
(2 stages of heat pump heating, 2 stages of auxiliary
back-up heating and 2 stages of emergency heating)

 Variable-capacity / multiple-stage heat / cool and

universal compatibility (gas/electric/heat pump/air
conditioner).

 Dual-fuel capable with two balance points.

 Indoor air quality with time‐based notification of

consumables including media filters, UVC bulbs,
humidifier pads and PureAir system catalyst
service / replacement,

 Humidification measurement and control.

 Dew point adjustment control

 Equipment maintenance reminders

 Autochangeover mode -- Permits control of heating,

cooling, humidification, and dehumidification without
user involvement

Installation and Setup

During initial thermostat start-up the following screen will
appear (see figure 1). This indicates that the thermostat
is active and booting up.

...

Figure 1. Boot-Up Screen

COMMUNICATION ERROR SCREEN

During initial thermostat start-up if the following screen
appears (see figure 2), this will indicate that the
thermostat has been incorrectly wired or has shorted

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wires. Turn power off to the system and verify that all
wiring is correct.

Figure 2. Communication Error Screen

Adjusting System Setting

SET TIME AND DATE

Use the arrows to select Time and Date; touch edit to
proceed to the “Set current time and date” screen.

When “Time and Date” screen appears, enter the correct
date as follows:

 Use the left and right arrows to change the month

and year.
 Touch a day of the month to select it.
 Touch on the hour or minute; up down arrows appear

to allow change.

 Touch the am/pm field to toggle it between am and

pm.

 When the correct date and time is set, touch save to

save settings and return to previous settings screen.

Touch next to continue to next screen.

CIRCULATE FAN ON TIME SETTING
“Circulate” is enabled on the user's home screen or

system settings page. It keeps air circulating from 15%

to 50% percent of time. The following settings
approximate how long the fan will run at these typical
settings:

15% (9 minutes fan run time per hour)
25% (15 minutes fan run time per hour)
35% (21 minutes fan run time per hour)
45% (27 minutes fan run time per hour).

NOTE - If the circulate fan mode is on, a timer is set to
measure all the time that the fan is blowing, regardless if
it is running to deliver heating or cooling or just for air
circulation.

DEALER NUMBER

Either the dealer number or phone number is required.
Once either number is entered, all other fields will
automatically be populated once the thermostat has
been registered during the Wi-FI set up procedure later
on in this instruction (if the dealer has an account with
Lennox already).

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

5

NOTE - Dealer number is the dealer's Lennox account
number. Dealer phone number is the dealer's main office
phone number.

1. Use the arrows to scroll down to the Dealer Number

or Dealer Phone setting. Press the edit button.

2. Enter the Dealer Number or Dealer Phone

Number using the on-screen keyboard. Press save

to continue.

NOTE: If a Dealer Number or Dealer Phone Number is
not entered and the next button is selected, a pop-up
warning screen will appear.

3. Press yes to continue to the System Devices

screen. Press no to return to the system settings

screen.

WARNING

Are you sure you want to proceed?

Please enter your DEALER PHONE NUMBER or DEALER NUMBER

If you do not enter either, the thermostat will not show up on

DaveNet and you will not be able to remotely monitor the system

status or receive email alerts when there is a problem.

no

yes

WARNING

The dealer number is your Lennox account number) i.e

A12345). Your dealer phone number should be the main office

phone number associated with your dealership. If you have any

questions, please contact your Lennox representative.

Are you sure you want to proceed?

Figure 3. Dealer Number Warning

The following table lists all of the installer configurable
system level parameters available from the installer set
up screens. After adjusting system settings, select next
to continue.

Table 1. System Settings

Parameter

Name

Default

Parameter Value

Setting

Increment

Time and

Date

—

(Time/date

elements screen)

—

Daylight

Saving Time

Enabled Enabled, Disabled —

Circulate Fan

ON Time

35% Range 15 to 45% 1%

Temperature

Unit

Fahrenheit

Fahrenheit or

Celsius

—

System Name —

(keyboard input

screen)

—

Dealer

Number

****

(keyboard input

screen)

Note: When adding

the dealer number,

all other dealer

fields will auto pop

ulate once thermo

stat registration is

completed.

—

Dealer Name Lennox —

Dealer

Address

— —

Dealer Phone

1-800-9-LEN

NOX

—

Dealer Email — —

Dealer

Website

www.lennox.

com

—

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Connecting to a Home Wi-Fi Router

Check the router utility program or contact service
provider for help. When determining the location for the

Wi-Fi thermostat, be sure it is in an area near enough to
the home Wi-Fi router to ensure good communications
signal strength between the thermostat and the Wi-Fi
router. (Hint: Use a smart phone with Wi-Fi and Wi-Fi
finder application to locate and determine optimal
location based on router Wi-Fi signal strength.)

NOTE - Thermostat will not be able to reliably connect to
a router if the received signal strength indicator (RSSI) is

-70 or greater.

NOTE - Correct the cause of any alerts prior to
continuing set up. Secure Connection Recommended!
Verify the home Wi-Fi router supports at least one of the
supports wireless bands (802.11b, g or n). Check router
utility program or contact service provider for assistance.

ENABLING WI-FI

To enable the Wi-Fi feature to communicate with a
wireless router

1. Press and release Wi-Fi in the lower left corner of

the HOME screen

indoor temperature

indoor humidity is 41%

fan is

OFF

9:39 am Aug 15, 2012

fan is
AUTO

cool-to

set temp

75

Heat-to

72

heat

or

cool

fan is
AUTO

enter
away

outdoor

temperature

80

system is cooling

Wi-Fi

?

1

Wi-Fi

Figure 4. Press Wi-FI

2. Press the Wi-Fi disable button to enable Wi-Fi.

WI-FIL SETTINGS

Press to enable /

disable Wi-FI

disabled

Thermostat is not connected to the Wi-FI network

WI-FI

X

Figure 5. Enable Wi-FI

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

7

3. The User Agreement screens will appear next.

Press next as many times as necessary; then press

accept after reading the User Agreement.
ESTABLISHING A WI-FI CONNECTION

There are two methods to set up your Wi-Fi connection.
Select either NETWORK SETTINGS or connection
status.

Method 1 — Network Settings Method

1. Press NETWORK SETTINGS; this screen shows a

graphical view of buttons representing OPEN and

SECURE Wi-Fi networks and a button for adding a

network.

WI-FI SETTINGS

press to enable /

disable Wi-FI

enabled

Thermostat is not connected to the Wi-FI network

WI-FI

X

NETWORK
SETTINGS

press to change
network settings

Must setup a network connection before registering thermostat

connection

status

Press to see

connection status

Figure 6. Enable Wi-FI

 Open connection which which requires no

password.

 Secure connection which requires Wi-Fi

password (security key).

 Add a network is required when Wi-Fi

identification (SSID) is being hidden (not
broadcasting). You will need to know the Wi-Fi
network name (SSID), security encryption type
(if enabled), and security password (if security
encryption is enabled).

2. When selecting a:
 unsecured connection a screen will appear with

two options, connect and router info. Press
connect to continue.

 secured connection a screen will appear

requesting the Wi-Fi network password
(security key). There are two options to select
from which are connect and router info. Using
the on-screen keyboard, enter the password
(security key) and then press connect to
continue.

HOME

DS9A

Open connection (no password required)

Secure connection (password required)

(lock icon is present)

Figure 7. Typical Connection Type and Signal

Strength

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NOTE - The router info button provides information
concerning the home Wi-fi connection (i.e, RSSI, IP
address, MAC address and wait state) all of which may
be helpful in troubleshooting network connection
issues).

3. If connection is successful the screen will return to
the available networks screens. Press AP3 as
exampled in figure 8 to return to the previous screen.
If the connection was successful it will be listed
connected as exampled below.

WI-FI SETTINGS

press to enable //

disable Wi-FI

9:39 am Aug 15, 2012

enabled

WI-FI

?

X

AP3

connected

press to change

wireless network

Must setup a network connection before registering thermostat

Wi-Fi

connection

status

Press to see

connection status

thermostat

not

registered

press to change

thermostat

registration

Figure 8. Network Connected

ESTABLISHING A WI-FI CONNECTION TO A
HIDDEN NETWORK

1. When connecting to a hidden network, press the

add new network icon to continue. Enter the
network name (SSID). If security encryption is

enabled, then press the security is none icon.
Select either WEP, WPA or WPA2.

2. Using the on-screen keyboard, enter the password
(security key). If the network name or security key
combination is incorrect or incorrectly type, and
access to the specified network failed, a message
will alert you to retry.

3. If connection is successful the screen will return to
the available networks screens. The network
successfully connected will be listed and shown as
connected as exampled in figure 8.

Method 2 — Connection Status Method

1. Press connection status; this screen shows a
graphical view of the current connection status.

2. Select the router icon to choose the desire W-Fi
network. When selecting a:

 unsecured connection a screen will appear with

two options, connect and Router Info. Press
connect to continue.

 secured connection a screen will appear

requesting the Wi-Fi network password
(security key). There are two options to select
from which are connect and router info. Using
the on-screen keyboard, enter the password

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

9

(security key) and then press connect to
continue.

3. If connection is successful the screen will return to
the available networks screens. Press X to return to
the previous screen. If the connection was
successful it will be listed connected as exampled
below.

WI-FI SETTINGS

press to enable //

disable Wi-FI

9:39 am Aug 15, 2012

enabled

WI-FI

?

X

xxxx

connected

press to change

wireless network

Must setup a network connection before registering thermostat

Wi-Fi

connection

status

Press to see

connection status

thermostat

not

registered

press to change

thermostat

registration

Figure 9. Network Connected

4. Select X to return to the WI-FI SETTINGS screen.
Select connection status again to verify that
connection to the router and Internet is active. Both
the router and internet icons will have green
backgrounds if connections are successful.

5. Skip the next section if connection to the home Wi-Fi
router, Internet and server were successful.

Troubleshooting Wi-Fi Connection

ROUTER / MODEM CHECK IF CONNECTION FAILS

1. Make sure the router and modem are turned on.

2. Check for connections to other wireless devices and
internet connection.

3. Make sure the thermostat's Wi-Fi is enabled and
connected to the home network (Router).

4. If having difficulty connecting to the router, online
research the router model number and/or internet
provider to discover and verify that the router band
is set to B, G or N bands. You will need to access the
routers utility program to make any changes. If not
accessible please contact your service provider for
help. The thermostat will connect to B, G or N band
routers at this time. NOTE: When set to B or G
bands, video streaming will likely be slower that N
band. If homeowner has implemented a dedicated N
band router for the purpose of video streaming, a
separate router for the thermostat may be required.

5. Reboot your router
A Unplug your power cord, wait 30 seconds, then

reconnect. If you have multiple routers, try
rebooting all of them when problems occur.

B If their are multiple routers you must have

different name and password for each one.

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C On your computer, turning Wi-Fi off and then

back on will force the system to rescan for
available networks. Do you see the network your
thermostat is trying to connect to?

6. Power cycle the thermostat.

7. Keep cordless phones, microwaves and other
electrical equipment at least 3.5 feet (1m) away from
access point.

A Try moving your router closer to the device if

possible. If connection is improved, then there is
probably some interference. Must have signal
stronger than -70db (also, see Router Signal
Strength on page 3); anything less will have
signal losses or not connect at all.

B Adjust the direction of the router toward the

thermostat. Adjust the routers antenna. A signal
repeater may be needed.

8. Try changing channels on the access point and test
it out with one of your internet devices (i.e. laptop,
desktop). The IP address to the server from the stat
will be close to the same IP address from the
computer to the server (www.mycomfortsync.com).

COMPUTER CONNECTIONS:

A On Access Point, Login to configuration (usually

web based interface) > go to Wireless Settings
and select a different channel > Save settings.

B Devices cannot change Wi-Fi channel. It is set

only at the router.

C On the thermostat, disable, then re-enable the

Wi-Fi connection.

9. Antenna in thermostat is fixed and cannot be moved.
Location of your access point with respect to the
thermostat is very important.

10. Baby monitors, garage door openers and wireless
video cameras may create signal interference.

11. Check your encryption key (Password).

12. Double check and re-enter your WEP/WPA
encryption keys / pass-phrases (usually found on
the router). If set to WEP security, change to WPA
if allowed.

13. In your thermostat's wireless settings, verify that
your encryption key (password) is correct. There can
not be spaces at the end of the SSID or Password.

14. It is important to note that number of walls that the
signal must pass thru to reach the thermostat can be
an issue. (e.g. 4 indoor walls, or 1 outdoor wall + 2
indoor walls could mean a weak signal at the
thermostat).

15. The addition of a signal repeater or extender maybe
an option. (Desktop or wall outlet plug-in devices are
available online or at your local electronics stores in
price range $70 - $150).

16. If multiple routers are in the home make sure each
router has a different name.

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11

17. If you don't get the pop up box that says the
registration request has been forwarded, then the
email was not sent to the server and the return
registration link will not be sent to your email
address. Try all the router troubleshooting
procedures and if you still can't get it to send the
email, cycle the power to the thermostat. This will
cause the thermostat to ask for the Lennox server
mac address again and try to resend the email.

18. If all is correct, refer user to their Router
manufacturer and Network provider. Router may
have incoming fire wall check with service provider.

ROUTER SIGNAL STRENGTH

After connecting to your router, you can check your
signal strength by pushing the Wi-Fi icon on the home
screen, then the networks button, then your network
button, then the router info button (see figure 10).

A strong wireless signal (RSSI) is indicated by a
NEGATIVE decibel number in the range from -46 to

-58db; anything greater than -70db will not connect.
If you are connected but have a signal above -70db then

you may consider adding a signal repeater/extender or
making some of the other router adjustment mentioned
in the Router / Modem Check section

router Info

connect

Push router info
button

Figure 10. Access connection data

AT+NSTAT=?
MAC=00:ID:C9:A0:40:95
WSTATE=CONNECTED MODE=AP

BSSID=98:FC:11:47:B9:00 SSID= LINKSYS” CHANNEL=6 SECURITY=NONE

RSSI=-78
IP ADDR=192.168.8.117 SUBNET=255.255.255.0 GATEWAY=192.168.8.1
DNSI=192.168.1.1 DNS2=0.0.0.0
RXCOUNT=14 TXCOUNT=345
OK

Figure 11. Connection Data

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Registering the Thermostat

REGISTRATION FOR ONLINE ACCESS

1. From the WI-FI SETTINGS screen, press either the

thermostat not registered icon or the connection
status icon and select the server icon.

WI-FI SETTINGS

connection

status

thermostat

not

registered

AP3

connected

press to change
network settings

press to enable /

disable Wi-Fi

press to change

thermostat

registration

press to toggle

off / auto

Wi-Fi

enabled

2. Enter homeowner email address and system
description and press the register button.

register

enter your email

Register with iComfort Wi-Fi thermostat to enable remote access and

online weather information

System Desc

3. A pop-up screen will appear asking if the email
address below is correct? Verify the email address
is correct and press yes.

4. Another pop-up screen will appear notifying the user
to check their email.

An email has been sent to

[e-mail]
with instructions on how to register your thermostat. If you haven't
received the email, please check your spam folder and make sure

that your email address is correct.

NOTE - If the email address originally entered is
incorrect, return to the thermostat registered screen
and reenter the correct information and press register.

5. After the iComfort Wi‐Fi® server sends the email
with the network link, registration and account
creation must be completed from the homeowner's
personal computer.

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13

NOTE - Time from pushing the registration button on the
thermostat and receiving the consumer portal register
link from your email on your computer is normally from 5
to 15 minutes depending on Internet speed and traffic.

6. After registration has been completed, press the
connection status icon to verify the connection was
successful. If the connection is successful the server
icon background will be green.

7. After successful connection to the server is
completed, the firmware update button will appear.
The default setting is set to auto. If any firmware
updates are available they will immediately start
downloading and update the thermostat. The
thermostat will reboot itself after the update is
completed. Updates are done in the background and
will not impair normal thermostat operations.

This auto update feature can be disabled by
pressing the firmware update button to toggle to
OFF but is not recommended.

NOTE - Firmware updates will not affect installer or user
thermostat settings. Both will be retained after the
update.

WI-FI SETTINGS

connected

Wi-Fi

enabled

thermostat

registered

Connection to server has not bee established or it has been lost.

Please wait until a connection is established.

firmware

update

auto

press to enable /

disable Wi-Fi

press to change
wireless network

press to change

thermostat

registration

press to search
for new update

NOTE ­If any downloads are available for the thermostat they will start down
loading right away. When new firmware is being downloaded or when
Gelaskins are being installed, the thermostat screen will temporarily go
blank and running units may cease operation while the system is being
reset to accommodate the new changes. This is normal and can last
a couple minutes.

AP3

connection

status

press to see

connection status

Figure 12. Registration for Online Access

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User Account Registration for Lennox Server
Access

Figure 13. Registration Screen

NOTE - This following information is customer set
up instructions and is shown here to allow the
installer to help walk the customer through the set
up process.

After registering through your iComfort Wi‐Fi® Flex
thermostat interface, go to the homeowner's computer
and locate the email sent from the server.

NOTE - if the customer has already set up an
account, click the “Click Here” button to access that
account.

Click on the Register link; the screen (to the left) will
appear. Fill in the User Name and Password fields and
check the agree to terms and conditions box. Click
Create User button.

A series of pages and prompts follows to provide
guidance through profile set up and user preference
definitions.

USER NAME REQUIREMENT

The following are the minimum user name requirements:
 User name must begin with a letter.

 User name has a minimum of four and a maximum

of 37 characters.

 User name is not case sensitive.

 User name cannot be a email address
 User name must be unique. If user name used is

already in use, a message indicating so will appear.

PASSWORD REQUIREMENT

The following are the password requirements:
 Upper and lower case combinations are allowed.

 At least one number must be used.

 Minimum of six characters.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

15

Firmware Update

FIRMWARE UPDATE BUTTON

1. Firmware Update (Off) – No automatic firmware
updates (highly recommend leaving ON)

2. If the status is changed from Off to Auto, it will trigger
an immediate check and update for the firmware
update. This can take up to 1 hour to complete
depending on the user's internet speed, signal
strength, internet traffic, etc.

3. Changing from Auto to Off during a download will
NOT stop the current download if it is already in
process.

4. Firmware Update (Auto) – (Default state). If
enabled, the thermostat checks for firmware update
a few minutes after commissioning and then every
24 hours in early morning hours.

5. Once a download is completed, the thermostat stops
all activity for up to 3 seconds, restarts for 5 seconds,
then continues with normal operation. All prior
system and user settings are retained (Equipment,
programs, Wi-Fi settings, etc.). Note a variation in
indoor temperature may be observed after restart.
This is normal operation of the thermostat while the
temperature sensor algorithms adjust after a restart
of the system.

Adding Outdoor Unit and Accessories

OUTDOOR UNIT (AIR CONDITIONER OR HEAT
PUMP)

To add (or remove) an outdoor unit, you must be at the
“Add or Remove Non-communicating equipment?”
screen.

1. Touch the yes button next to Add or Remove
Non-communicating equipment?.

2. In the “non-communicating device list” screen, use
the arrows to highlight Outdoor Unit Type and
touch edit.

3. Touch one of the radio buttons to select a 1-or
2-stage air conditioner unit or a 1-or 2-stage heat
pump unit; touch save.

4. Use arrows to highlight any red colored text in the
device list (e.g. select Outdoor Unit Capacity;
text turns white). Touch edit.

5. Use either the up or down arrows to display the
correct size outdoor unit. Touch save to continue.

NOTE - If the defaults are correct, you do not have to
make any changes, but you must touch save. When all
red text is gone, the back button will appear; touch it to
return to the “Add or Remove Non-communicating
equipment?” screen.

HUMIDIFIER

Before adding a humidifier, be sure that the:

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 Humidifier is wired to the equipment interface

module and furnace or air handler control,

 Entire system is wired, powered up and you are at

the “Add or Remove Non-communicating
equipment?” screen.

To add a humidifier:

1. Touch the yes button on this screen.

2. In the “non-communicating device list” screen, use
the arrows to highlight Humidifier (note the current
value, Not Installed) and touch edit.

3. Touch one of the radio buttons to select the type of
humidifier (or select Not Installed, if removing
humidifier); touch save.

4. The previous screen returns, but the current value
now shows your selection. Touch the back button.

5. The “Add or Remove...” screen reappears with your
addition shown in the system devices list. At this
point, you may add more equipment (touch yes) or
if finished, touch the next button to advance to the
“Adjust a setting...” screen (see page 17).

NOTE - Adding humidity regulating non-communicating
devices may be a 2-step procedure:

 First the device must be installed and wired. After

the humidifier is installed, the setting under the

"System" mode "Humidification Control Mode"
defaults to "Basic".

 Second, if you want another mode, i.e. Precision,

Basic Dew Point, or Precision Dew Point, the device
requires further configuration (see page 17).

AUXILIARY DEHUMIDIFIER

Before adding a dehumidifier, be sure that:
 the dehumidifier is wired to the equipment interface

model and furnace or air handler control.

 the entire system is wired, powered up and you are

at the “Add or Remove Non-communicating
equipment?” screen.

To add (or remove) a dehumidifier, you must be at the
“Add or Remove Non-communicating equipment?”
screen.

1. Touch the yes button on this screen.

2. In the “non-communicating device list” screen, use
the arrows to highlight Dehumidifier and touch edit.
Note the current value (e.g. Not Installed).

3. Touch one of the radio buttons to select the type of
dehumidifier (or select Not Installed, if removing
dehumidifier); touch save.

4. When you scroll to the Dehumidifier device, (Note
the current value, e.g. auxiliary dehumidifier.) Click
back to return to the “Add or Remove...” screen.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

17

5. The “Add or Remove...” screen reappears with your
addition shown in the system devices list. At this
point, you may add more equipment (touch yes) or
if finished, touch the next button to advance to the
“Adjust a setting...” screen.

NOTE - The device must be installed and wired. After the
dehumidifier is installed, the setting under the "System"
mode "Dehumidification Control Mode" defaults to
"Basic".

Adjusting Humidification and Dehumidification
Settings with Outdoor Units

HUMIDIFICATION SETTINGS — SYSTEM DEVICES
SCREEN

Pre-adjustment REQUIREMENTS:

 First the device has been installed.

 Second, you pressed next at the “Add or

Remove...” screen.

Configure the device as follows:

1. In the “system devices” list, use the arrows to
highlight System. Touch edit.

2. In the “System” list, use the arrows to highlight
Humidification Control Mode. Touch edit.

3. Touch one of the radio buttons to select the mode of
humidification control; touch save. (After saving,

check that the current value now shows the new
selection).

4. Touch the back button to return to “Adjust a
setting...” screen.

NOTE - If the defaults for the settings are shown in red,
you are not required to make any changes, but you must
go into the edit tool, and touch save. When all red text is
gone, the back button will appear; touch it to return to the
“Adjust a setting...” screen.

How Humidification Mode Works

DISPLAY, BASIC AND PRECISION—These modes

allow user control of relative humidity between 15 and
45%. These conditions must be met for either mode to
operate:
 humidification mode has been enabled, and

 the unit is in HEAT mode, and
 humidification demand exists (24V present at H),

and

 DISPLAY mode indicates humidification is OFF.
 BASIC mode mode also requires presence of

heating demand [Y for HP heat, or W for gas heat (W
may be energized with G de-energized)].

 PRECISION—(Available only if Wi-Fi is operational

or outdoor sensor is attached)

507428-01

18

Basic Dew Point Control adjustment mode will change
the humidification setpoint based on the outdoor
temperature and a user-defined dew point adjustment
setting.

Precision Dew Point Control adjustment mode will
operate when these conditions are met:

 humidification mode has been enabled, and

 the unit is in HEAT mode, and

 humidification demand exists (24V present at H).

HUMIDIFICATION SETTINGS — FEATURE
SCREEN

SYSTEM SETTINGS

current indoor humidity is 50%

humidifier

is ON

de-

humidifier

MEDIUM

40

%

set to

50

%

set to

ALL CHANGES MADE ON
THIS SCREEN ARE IN
STANTLY SAVED.

9:39 am Aug 15, 2012

?

Wi-Fi

OFF

MEDIUM

HIGH

humidifier

display

is ON

humidification

settings

dehumidification

settings

Figure 14. Humidification Controls

1. From the Main Screen, touch the right arrow icon
to go the the Features screen.

2. From the Features screen, select system settings.

3. Touch the button of the humidification settings you
want to adjust; if it says humidifier OFF, one touch
will display a selection for ON.

4. When you touch the set-to button, the arrows
appear, allowing you to change to the desired
humidity percentage setting.

DEHUMIDIFICATION SETTINGS — SYSTEM
DEVICES SCREEN

Pre-adjustment REQUIREMENTS
 First the device has been installed

 Second, from the “Add or Remove

Non-communicating equipment?”, touch next.

 Third, in the “Adjust a setting...” screen, configure

the device as follows:

1. In the “system devices” list, use the arrows to
highlight System. Touch edit.

2. Use arrows to highlight Min Dehumidification
Setpoint; touch edit. Note the current value (e.g.

45).

3. Use arrows to make changes; touch (After saving,

check that the current value now shows the new
selection).

4. Touch the back button to return to “Adjust a
setting...” screen.

DEHUMIDIFICATION SETTINGS — FEATURE
SCREEN

1. From the Main Screen, touch the right arrow icon
to go the the Features screen.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

19

2. From the Features screen, select system settings.

3. Touch the button of the dehumidification settings you
want to adjust; if it says de-humidifier OFF, one touch
will display a selection for OFF, MEDIUM or HIGH.

4. Selecting MEDIUM or HIGH will bring on the set-to
button.

5. When you touch the set-to button, the arrows
appear, allowing you to change to the desired
de-humidifier percentage setting.

SYSTEM SETTINGS

current indoor humidity is 50%

humidifier

is ON

de-

humidifier

MEDIUM

40

%

set to

50

%

set to

ALL CHANGES MADE ON
THIS SCREEN ARE IN
STANTLY SAVED.

9:39 am Aug 15, 2012

?

Wi-Fi

OFF

MEDIUM

HIGH

humidifier

display

is ON

(default is ON)

humidification

settings

dehumidification

settings

Figure 15. Humidifier Controls (Outdoor Unit)

HOW DEHUMIDIFICATION MODE WORK — NO
EXTERNAL DEHUMIDIFICATION DEVICE

NOTE - OFF, MEDIUM and HIGH dehumidification modes
are also a function of the HVAC system with NO external
dehumidification devices installed.

In OFF mode, dehumidification if off.

In MEDIUM mode, dehumidification occurs if these
conditions are met and signals are present at specific
terminals:

 dehumidification has been enabled on installer

settings, and
 the unit is in COOL mode, and
 dehumidification demand exists (RH above setpoint),

and
 cooling demand exists (Y1 energized).

In HIGH mode, dehumidification occurs if all BASIC
conditions are true, except cooling demand may or may not
be present. Also note that:

 Maximum over cool from cooling setpoint is 2ºF.
 Deadband temperature is limited to a minimum of

5ºF (instead of 3ºF in DRY or MODERATE modes)

because of 2ºF overcooling.

AUXILIARY DEHUMIDIFIER — OUTDOOR UNITS

Control State Conditions

Auxiliary dehumidification
is controlled by
thermostat.

 System must be in cooling mode and have

a call for dehumidification from the
thermostat. This will start the auxiliary
dehumidifier.

 A separate wire from auxiliary dehumidifier

will need to be run to G terminal on indoor
unit control to start the blower.

Auxiliary dehumidification
is controlled by dehumidi
fication control.

Needs a dehumidification demand from the
stand-alone dehumidification thermostat and a
separate wire run to G terminal on indoor unit to
start the blower.

507428-01

20

Using the Tests / Diagnostics Features

Blower

HP Heat - 1st Stage

HP Heat - 2nd Stage

Defrost Now

Cooling - 1st Stage

Cooling - 2nd Stage

Gas Heat - 1st Stage

Gas Heat - 2nd Stage

select all

select test to run

deselect all

skip tests

start

Only appears

if test item is

selected

Ö

1

2

3

4

5

Figure 16. Selecting Tests

TO SELECT TESTS TO RUN

Use the following procedure to run tests for various
heating and cooling stage operations.

1. Select a specific test (1) to run or use the select all
(2) button to run all configurations. Use the deselect
all (3) button to un-check desired test.

2. Touch the start button (4) to run all selected tests or
touch skip tests (5) to end the test procedure.

3. After the tests are completed or you have selected
skip test select the exit button to end.

NOTE - Test mode lasts for 30 minutes (with the
temperature updating every 30 seconds) except for the
defrost test, which lasts 30 seconds. Tests feature
provides the technician time to manually verify the
equipment operation.

The tests feature is available after set up has been
completed once. After you touch next in the final set up
screen, the “select tests to run” screen (figure 16) will
appear. (If you want you may skip tests; touch skip
tests.)

To run all of the tests, touch select all. All boxes in the list
of tests will be checked. Or, touch box(es) next to test(s)
to run certain tests.

After the tests have been started, the screen will
describe which test is running and show a diagnostic
summary of each test (see figure 17). After reviewing the
results and concluding that no further tests are needed,
touch next to proceed to next test. The technician must
verify that the test procedure is producing the desired
result at the equipment.

After pressing next after the final test, the Testing
finished screen will appear (figure 18). At this point, use
the EXIT button (if you have completed the required set
up), or use diagnostics button (to analyze the system),
or use equipment button (if you wish to make any
changes to device details).

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

21

9:39 am Aug 15, 2012

Heating Rate
Blower CFM Demand
Blower Off Delay
Blower On Delay
Indoor Blower RPM
Indoor Blower Power
Flame Current
Flame Sense
Outdoor Temperature

current test: Blower

Check Blower Operation

%
1400CFM
Off
Off
0

0.0000%

0.000mA
No Flame
63ºF

nextcancel

setup

tests equipment alerts diagnostics

Figure 17. Typical Tests Results Screens

9:39 am Aug 15, 2012

nextcancel

setup

tests equipment

alerts

diagnostics

press 'EXIT' button to start normal operation

The Testing Process is finished

press 'tests' button to run more tests

Figure 18. Testing Finished Screen

Touch confirm to continue system configuration; the
screen will change to the system discovery screen. At
this point, the program goes through the same set up as
the initial set up process which begins on page 3.

NOTE - “Compatible device found” screen (shown
below) appears only when a device has been removed
and replaced with a compatible device.

Missing
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)

Found Compatible
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)

Settings were not copied

iComfort® Equipment Interface Module

The iComfort® Equipment Interface Module (EIM) can
be configured in the following set ups:

Thermostat, Equipment Interface Module with a
(conventional) indoor and outdoor units.

1. Wiring—See Communicating System and
Optional Accessories Wiring diagrams.

D 4-conductor thermostat wire from the iComfort

Wi‐Fi® Flex thermostat to the equipment

interface module (R, i+, i-, C)

D Up to 8-conductor thermostat wire from the

conventional furnace and outdoor unit terminal
strips to the equipment interface module (R, C,
O, Y1, Y2, G, W1, W2 and W3).

D Wiring as required for accessories

2. DO NOT cut any option link on furnace control.

507428-01

22

3. After the entire system is wired, power up the
system; the iComfort Wi‐Fi® thermostat will check
the system for equipment interface module.

4. On the thermostat, go past the Add or remove

non-communicating devices to the To adjust a
setting screen. Select System from the device list

using the up/down arrows and press the edit button

5. Select Balance Point Control and press edit. Use
the down arrow to select Enabled and press save.
High and Low Balance Points will appear in red.

6. Complete Balance Point Control by editing the High
and Low Balance Points. It is not necessary to
change the defaults, but you must save each setting.
The red settings will go away after pressing save.
Press the back button to return to the adjust screen.

7. Use the arrows to select Furnace from system
devices list; press edit. From this Furnace screen
you will have access to the various airflow settings.
Set the system air volumes according the needs of
the home. When you change certain settings, the
system will prompt you to please view and save all
red settings. Use the arrows to select the red
settings and press edit. Either make changes or not,
but press save either way. The red settings will go
away after pressing save. When all CFM settings
are complete, press the back button. Press next
step to advance to the tests button.

8. Test the system operation and confirm the heat
pump unit is electrically energized and operational.
Press done.

9. Exit the installer set up mode by selecting the EXIT
button.

TIPS

 High and Low Balance points are enabled and

adjusted under the installer section of the
thermostat. In the equipment button select “System”
and press edit. Scroll down to Balance Point Control
and press edit and select Enabled and then save.

 An outdoor temperature sensor is required

(field-provided) and connected to the outdoor air
sensor terminal on the Equipment Interface Module.

 To display the outdoor temperature on the home

screen of the thermostat, you must turn on the
Outdoor Temp Display.

Using the Secure Web Portal

Access all the great Wi-Fi enabled features on your
iComfort® thermostat from our secure web portal.

www.myicomfort.com

After signing in, you’ll be able to view your iComfort
system settings, adjust the temperature and view
reminders and alerts – just as you would on your
iComfort thermostat at home. With a familiar look and
settings this simple, you should feel right at home. Don’t
forget to check out the available Apps and skins.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

23

1. From the Home screen, press the
Features button.

2. Select Display Settings

3. Select outdoor temp display.
Options are off, internet and
sensor.

indoor temperature

indoor humidity is 41%

cool-to

set temp

75

heat to

70

heat

or

cool

outdoor

temperature

80

touch to go
to Features

use arrows

to change

temperature

Outdoor

temperature

system is cooling

9:39 am Aug 15, 2012Wi-Fi

?

enter

away

fan is

OFF

fan is
AUTO

forecast

Hi 85
Lo 60

From the web portal welcome page, you may also click
on links to launch an interactive demo or learn more
about iComfort.

Skins

By adding a skin and matching skin image screen-saver
to your iComfort Wi-Fi, you can coordinate it with the
decor in any room. Skins are available in many colors,
patterns and designs.

Skins can be ordered from nuvango.com

Go to Shop > All Products and scroll down to

EVERYTHING ELSE and select LENNOX

ICOMFORT

After ordering the skin, the company will email the image
file (.jpg) to you. The frame skin will be mailed to you as
well. The skin image can be uploaded to the iComfort
Wi-Fi thermostat from the consumer portal site
(www.myicomfort.com) under the tab ”skins”.

Screen-Saver

You can also customize the screen-saver by uploading
your own photo on· www.myicomfort.com under the
tab ”skins”. Image must be 800x480 DPI in JPG format.

HOW DO I TURN ON SCREEN-SAVER

1. From the thermostat Home screen, press .

2. Press the display setting button.

3. Press the screen saver button.

4. From the pop-up menu, select either on for the
default screen-saver or skins for your custom
uploaded image. The skin picture will appear after 30
seconds of inactivity.

 When set to off, the screen stays on.
 When set to on, after 30 seconds of inactivity

the screen will go blank

 When set to skins and no skin or custom image

has been uploaded, the screen will display

507428-01

24

LENNOX after 30 seconds of inactivity. If a skin
or custom image has been uploaded, after 30
seconds of inactivity, the image will be
displayed.

Accessing Installer Screens and Changing
Equipment Parameters

To access the installer screens after the unit has been
placed in operation and the user home screen is
displayed, touch the “Lennox” logo and hold for 5
seconds. The system will access the installer screens.

A message screen stating “Qualified Lennox equipment
installer warning” screen appears.

1. When pressing yes, the thermostat will search for
equipment interface module.

2. When pressing no, the thermostat returns to the
main screen.

3. When pressing reset, the thermostat resets all
parameters to factory default, searches for
communicating equipment and erases all
information concerning conventional equipment
previously stored in the thermostat.

After initial installation, if an alert is present when you are
making changes to settings, no action on the alert is
mandatory.

Press equipment if you need to set up equipment
parameters and edit details of devices in the system.

Press diagnostics if you need to analyze the system
(see page 20).

If any component of the HVAC system has been
changed, e.g. replacing an outdoor sensor, reconfiguring
the system will be required. To begin reconfiguring a
system (after you have accessed the program from the
Lennox logo [previous page]), touch the setup button.
The “Start system configuration” screen will appear.
Press start to proceed. The “Re-configure confirmation”
screen will appear. This reminder notes that system
configuration may affect some existing device settings
and prompts to confirm or cancel the configuration
process.

Press confirm to continue system configuration; the
screen will change to the system discovery screen. At
this point, the program goes through the same set up as
the initial set up process which begins on page 3.

NOTE - “Compatible device found” screen (shown
below) appears only when a device has been removed
and replaced with a compatible device.

Missing
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)

Found Compatible
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)

Settings were not copied

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

25

ADJUSTING EQUIPMENT PARAMETERS AFTER
INITIAL INSTALLER SET UP

1. From the Home Screen, touch and hold Lennox
until the warning screen appears. Press yes to
continue.

2. Press equipment to change equipment parameters
and edit details of devices in the system without
having to re-run the set up program.

3. Select the equipment button to continue. The

system devices screen will open. Use the arrows to
select a device and touch edit.

4. Use the arrows to highlight a setting and then touch
edit.

5. When finished, touch back; equipment parameters
screen then touch next. “Select tests to run screen
appears"; either run tests as before or touch skip
tests.

507428-01

26

Wiring Diagrams

Figure 19. Thermostat and Conventional Indoor Unit and Air Conditioner

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

27

Figure 20. Thermostat and Conventional Indoor Unit and Heat Pump

507428-01

28

iComfort Wi‐Fi

®

Outdoor Unit

iComfort Wi‐Fi

®

Flex Thermostat

Single wire to

terminal C

Single wire to
terminal C

Unused wires

RSBus

Minimum wire size is 18
gauge

Maximum total length of all connections on the RSBus is limit
ed to 1500 ft. (450 m). Max. length between components is
300 ft. (90 m).

Note: iComfort Wi‐Fi® Flex thermostat does not require shielded cable wiring.

BEST PRACTICES! Keep all communication wiring as far away from house electric
al wiring and large electrical appliances as possible (15' [5m] recommended).

iComfort Wi‐Fi

®

Equipment Interface

Module

Unused wires

Figure 21. Thermostat Wire Termination in Communicating System (Electrical Noise)

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

29

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Priority Alert Text Steps to clear

10 Critical

(Thermostat) The thermostat has
found an unknown device on the sys
tem.

The room thermostat has found an unknown device on the system.
An unknown device is seen by the room thermostat in or outside of configura

tion mode.
Clear by reconfiguring the system

11 Critical

(Thermostat) The thermostat cannot
find a previously installed unit.

Check all connections and cycle system power. If problem persists, clear by
reconfiguring the system. Press the setup tab, touch start, and touch confirm.

12 Critical

(Thermostat) The thermostat cannot
find an iComfort®enabled equipment
interface module.

Thermostat did not find an Indoor Unit. Make sure there is an iComfort® equip
ment interface module is on the system. Check R, i+, i and C connections,
ohm wires and cycle power. Replace equipment interface module control if
there is no response.

14 Critical

(Thermostat) The thermostat found
more than one thermostat, more than
one indoor unit, or more than one out
door unit on the system.

Check wiring and remove duplicate equipment. Reconfigure system.

18 Minor

(Thermostat) The outside temperature
is below the level where the heat
pump is programmed to heat the
home. The system will not use the
heat pump to warm your home.

Notification only  Outdoor Temp is below the Low Balance Point. Heat Pump
will not be used to service a heating demand.

19 Minor

(Thermostat) The outside temperature
is higher than the level where the fur
nace or electric heat is programmed
to work. The system will only use the
heat pump to warm your home.

Notification only  Outdoor Temp is above the High Balance Point. Indoor Unit
(furnace or airhandler) will not be used to service a heating demand.

507428-01

30

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clearAlert TextPriority

29 Critical

(Thermostat) The thermostat is read
ing an indoor temperature that is high
er than 99ºF. The thermostat will not
allow any heating operation to begin
until it senses a temperature lower
than 99ºF.

Indoor temperature rose above 99ºF during a heating or cooling demand.
Heating operation is not allowed. Check to ensure that Heating Equipment is
not stuck ON (reversing valve, etc.). Check the accuracy of the thermostat
temperature sensor. Select cooling system mode to cool the indoor space.

30 Moderate

(Thermostat) The thermostat is read
ing an indoor temperature that is lower
than 40ºF. The thermostat will not al
low any cooling operation to begin un
til it senses a temperature higher than
40ºF.

Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure
that cooling equipment is not stuck ON. Check accuracy of the thermostat
temperature sensor. Select heating system mode to heat the indoor space to
above 40ºF.

31 Critical

(Thermostat) The thermostat has lost
communication with the (furnace,
airhandler or outdoor unit) for more
than 3 minutes.

[Indicated unit] has not communicated with thermostat for more than 3
minutes. Check connections. Ohm wires. If fault persists, then cycle power.
Fault clears after communication is restored.

32 Moderate

(Thermostat) The (furnace, airhandler
or outdoor unit) is resetting itself.

[Indicated unit] is resetting itself. This event may occur during a power outage
or power fluctuation in the system. If persistent or if it coincides with the sys
tem operation then proceed with the following steps. Check the power connec
tions, check the amp draw at the transformer (the transformer maybe over
loaded) and check 24VAC voltage at the DEVICE. The alarm is only cleared
by pressing the clear button on the Installer Alerts Tab. If the fault persists after
checking the connections, replace the unit's control board.

34 Critical

(Thermostat) The thermostat does not
know the capacity (tonnage) of the
(furnace, airhandler or outdoor unit).
Please program the correct capacity
of the (furnace, airhandler or outdoor

unit).

[Indicated unit] is missing the programmed unit capacity. Go to [Indicated unit]
and program the unit capacity manually. See the unit IOM for programming
instructions. Remove power to thermostat before programming the unit control
board. Once programming is complete, reconnect thermostat wires and recon
figure system.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

31

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clearAlert TextPriority

36 Critical

(Thermostat) The system has been
heating for at least 15 minutes,
without a demand for heating.

Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.

Step 1: Check all heating equipment to determine cause of heating demand.
Step 2: Recycle power.

System will clear code when it detects condition has cleared.

37 Critical

(Thermostat) The system has been
cooling for at least 15 minutes, without
a demand for cooling.

Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.

Step 1: Check all cooling equipment to determine cause of cooling demand.
Step 2: Recycle power.

System will clear code when it detects condition has cleared.

38 Critical

(Thermostat) The system has not
been able to turn on the heating for
more than 45 minutes. The system
will go offline for 60 minutes and try
again.

Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.

Step 1: Check all heating equipment to determine cause.
Step 2: Recycle power.

System will clear code when it detects condition has cleared.

39 Critical

(Thermostat) The system has not
been able to turn on the cooling for
more than 45 minutes. The system
will go offline for 60 minutes and try
again.

Run the system in diagnostic mode and verify that it matches actual equipment
operation. Check for other alarms/codes that may be preventing the system
from operating as expected.

Step 1: Check all cooling equipment to determine cause.
Step 2: Recycle power.

System will clear code when it detects condition has cleared.

120 Moderate

(Thermostat / Furnace / Air Handler /
Outdoor Unit / Equipment Interface
Module) There is a delay in the (Ther

mostat, furnace, airhandler or out
door unit) responding to the system.

Typically, this alarm/code does not cause any issues and will clear on its own.
The alarm/code is usually caused by a delay in the outdoor unit responding to
the thermostat. Check all wiring connections. Cleared after unresponsive
device responds to any inquiry.

507428-01

32

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clearAlert TextPriority

124 Critical

(Thermostat / Furnace / Air Handler /
Outdoor Unit / Equipment Interface
Module / Damper Control Module))
The thermostat has lost communica
tion with the (furnace, airhandler or
outdoor unit) for more than 3 minutes.

Equipment lost communication with the thermostat. Check the wiring connec
tions, ohm wires and cycle power. The alarm stops all associated HVAC oper
ations and waits for a heartbeat message from the unit that's not communicat
ing. The alarm/fault clears after communication is reestablished.

131 Critical

(Thermostat / Furnace / Air Handler /
Outdoor Unit / Equipment Interface
Module / Damper Control Module))
The (Thermostat, furnace, airhandler
or outdoor unit) control parameters
are corrupted.

Reconfigure the system. Replace the control if heating or cooling is not avail
able.

132 Critical

(Air Handler / Damper Control Mod
ule) The device's control software is
corrupted.

Recycle power. If failure reoccurs, replace the control. System reset is re
quired to recover.

180 Critical

(Furnace / Air Handler / Outdoor Unit/
Equipment Interface Module) The
thermostat has found a problem with
the (furnace, airhandler or outdoor
unit) outdoor sensor.

In normal operation after control recognizes sensors, the alarm will be sent if
valid temperature reading is lost. Compare outdoor sensor resistance to tem
perature/resistance charts in unit installation instructions. Replace sensor pack
if necessary. At the beginning of (any) configuration, furnace or airhandler
control will detect the presence of the sensor(s). If detected (reading in range),
appropriate feature will be set as 'installed' and shown in the 'About' screen.
The alarm/fault will clear upon configuration, or sensing normal values.

290 Critical

(Furnace) There is a problem with the
furnace ignition circuit.

The system will go into Watchguard mode. Measure resistance of hot surface
igniter. Replace the hot surface ignitor it is not within specifications. The alarm/
fault will clear on next successful ignition.

345 Critical

(Air Handler / Equipment Interface
Module / Heat Pump) The “O” relay on
the airhandler has failed. Either the
pilot relay contacts did not close or
the relay coil did not energize.

O relay / Stage 1 failed. Pilot relay contacts did not close or the relay coil did
not energize. Replace control. Cleared after the fault recovered following reset.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

33

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clearAlert TextPriority

347 Critical

(Furnace / Air Handler / Equipment
Interface Module) The “Y1” relay on
the (furnace or airhandler) has failed.
Either the pilot relay contacts did not
close or the relay coil did not ener
gize.

Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close
or
the relay coil did not energize; no input back to IFC chip). Critical Alert.
Cleared after reset and Y1 input sensed.

348 Critical

(Furnace / Air Handler) The “Y2” relay
on the (furnace or airhandler) has
failed. Either the pilot relay contacts
did not close or the relay coil did not
energize.

Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did
not energize; no input back to IFC chip). Critical Alert. Cleared after reset and
Y1 input sensed.

380

Moderate

/ Critical

(Equipment Interface Module) Inter
lock relay failure (IFC or AHC mode
only)

Interlock relay is energized, but input is not sensed after 3 seconds. There will
be no heating or cooling due to this error. Deenergize interlock relay and ener
gize after 5 minutes if demand is still present.

381

Moderate

/ Critical

(Equipment Interface Module) Inter
lock relay stuck (IFC or AHC modes
only)

Interlock relay continuously sensed (with relay off). No heating and cooling
operations. Alarm clears 30 seconds after fault clears.

382 Moderate

(Equipment Interface Module) Relay
W1 failure (IFC and AHC modes only)

W1 relay energized, but input is not sensed after three seconds.

420 Critical

(Outdoor Unit) The “W” output termin
al on the outdoor unit is not wired cor
rectly

Defrost cycle lasts longer than 20 minutes. Check heat pump operation.
Cleared
when W1 signal is removed. Applicable only in communicating mode with
noncommunicating heat pump.

594

Moderate

/ Critical

(Equipment Interface Module) Precoil
discharge air temperature sensor
problem (DFM mode only). Advances
from moderate to critical after ten (10)
minutes.

Interlock relay energized, but input not sensed after 3 seconds. No heating and
cooling operations. Deenergize interlock relay and reenergized 5 minutes
later if demand is still present. Alarm clears 5 minutes after fault clears.

507428-01

34

Table 2. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clearAlert TextPriority

600 Critical

Compressor has been cycled OFF on
utility load shedding.

Load shedding function: Provides a method for a local utility company to limit
the maximum power level usage of the outdoor unit. The feature is activated by
applying 24 volts AC power to the L and C terminals on the outdoor control.

601 Critical

Outdoor unit has been cycled OFF on
low temperature protection.

Low temperature Protection: Outdoor unit will not operate when the outdoor
temperature is at or below 4°F (20°C). If the unit is operating and the outdoor
temperature drops below 4°F (20°C), the unit will continue to operate until the
room thermostat is satisfied or the outdoor temperature drops to 15°F (26°C).
(Outdoor unit ambient sensor provides temperature readings).

700 Moderate

(Thermostat) The temperature sensor
in the thermostat is not working prop
erly.

Recalibrate thermostat to clear. Replace thermostat if needed.

701 Moderate

(Thermostat) The thermostat is read
ing indoor temperatures above the
preprogrammed limit.

Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace ther
mostat, if needed.

702 Moderate

(Thermostat) The thermostat is read
ing indoor temperatures below the
preprogrammed limit.

Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace
thermostat, if needed.

703 Moderate

(Thermostat) The humidity sensor in
the thermostat is not working properly.

Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.

704 Moderate

(Thermostat) The thermostat is read
ing indoor humidity levels above the
preprogrammed limit.

Recalibrate thermostat to clear. Replace thermostat, if needed.

705 Moderate

(Thermostat) The thermostat is read
ing indoor humidity levels below the
preprogrammed limit.

Recalibrate thermostat to clear. Replace thermostat, if needed.

Ohm

Check

—

The ohm reading in the system is
either too high or too low.

Ohm reading between i+ and i anywhere on the RSBus with supply power off
should be between 70 and 90 ohms. If above 90 ohms, check and repair wir
ing, splices or other wiring defects that may be causing the excessive resist
ance. If less than 70 ohms, check for shorted wires.

7-Day Programmable iComfort Wi‐Fi® Flex Thermostat

35

HOMEOWNER SERVICE ALERT CODES

Number Value Number Value Number Value Number Value Number Val ue

3000 Filter 1 3002 Humidifier

Pad

3004 Maintenance 4000 User Wi-Fi state

change, disable

4002 Image file down

load failed

3001 Filter 2 3003 UV Light 3005 PureAir Main

tenance

4001 Firmware download

failed