3iE Energy-Monitoring Thermostat

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The 3iE Energy-Monitoring thermostat is a programmable floor heating thermostat that offers precise temperature control. Download Warmup 3iE thermostat user manuals below. Comes with a 3-Year warranty.



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Can I turn my thermostat above 86°F?


You may be able to alter your advanced settings, allowing your floor to heat above 86°F, depending on the finished flooring type you have.

Conduit Requirements when Installing your Warmup System


We recommend using a conduit 1/2 conduit for one lead or a 3/4″ conduit if connecting two systems to one thermostat. In addition, we recommend a separate 1/2″ conduit for the floor sensor.

What Does the Control Fault Error Message Mean?


The Control Fault message might occur for several reasons. Please contact your electrician to have them test the resistance of your heating system based on the heating model that was installed in your floor using a digital multimeter set to a 200 ohms scale.

Where do I place the sensor probe when installing the DCM-PRO cables?


This page outlines the recommended installation methods for your installing your sensor probe.

What does it mean if my thermostat reads “output fault detected” on the display?


It is likely to be a wiring or installation issue. Please consult our installation manual for further assistance. Troubleshooting steps will need to be done with a licensed electrician. Please have the electrician call us on site with the model numbers that were installed and a multimeter for testing.

What is causing my thermostat to keep tripping requiring that I press the reset button?


One reason why your thermostat keeps tripping could be that you have GFI on the thermostat and the breaker simultaneously.  Click “Read More” for details.

What does it mean if my thermostat reads “ER 1 Out” on the display?


It indicates that the thermostat is not set up correctly. Click “Read More” for details.

Programming the Floor Temperature


The “Program Schedule” feature of the 3iE allows you to choose how you want to program your floor temperature settings.  Click “Read  More” for details.

Initial Set up of the 3iE Energy Monitoring Floor Heating Thermostat


Warmup’s 3iE is designed to make the initial programming incredibly easy.  Click “Read More” where we outline how to do it.

Do you have to wire the floor sensor probe that comes with the 3iE thermostat?


That floor probe is an important part of having your floor heating system function properly.  Click “Read More” for details.

Mounting the 3iE Energy Monitoring Floor Heating Thermostat


Read this before choosing your gang box. Click “Read More” for important information.

How to wire the 3iE Energy-Monitoring Floor Heating Thermostat


Learn how to wire your 3iE and probe for both 120V and 240V configurations.  Always use a licensed electrican.  Click “Read More” for details.

Can I Install the Thermostat Inside the Shower?


The thermostat cannot be installed in the shower and here’s why.

How can I turn my system on or off completely?


You can turn your 3iE on or off using the button next to the GFCI tab at the bottom. Under your thermostat you will find a flat tab indicating the GFCI status of your thermostat. Next to that tab there is a small button. Hold it for 5-6 seconds to turn it on or off.

What does “ER1” on the thermostat display mean?


The ER1 message will also occur if no floor sensor is connected to the thermostat. Have your electrician make sure that the sensor probe wires are securely connected in ports 1 and 2 of the thermostat. If sensor was not installed, your thermostat can be programmed to read the air temperature instead by following the steps below.

Thermostat Reads Error Message “ER2” on the Display?


The ER2 message will occur if the floor sensor has a short circuit or has a loose connection. Click “read More” for details.

Ground Fault Error: What does this Mean if my Thermostat has “Ground Fault Error” on the Display?


This message will occur if a ground fault is detected. Click “Read More” for details.

What if my thermostat screen is black and won’t turn on?


If your thermostat has no display and will not turn on when power button is pushed, the thermostat could be wired incorrectly. Click here for more details.

Why is my Floor not Reaching Target Temperature?


If your heating system was installed on a concrete slab or over an unheated space and insulation boards were not used, it is possible that the heat loss into the subfloor will cause your floors to heat up more slowly and possibly not reach the target temperature. Click “Read More” for details.

My Floor has No Heat but There Are No Error Messages?


If your floor is not heating, you should contact your electrician to do proper troubleshooting. Click “Read More” for details. 

Why does my thermostat trip every time it reaches the same temperature?


The resistance for your mat or cable is calculated on the length of the heater. Shortening the heater would increase the resistance and thereby the temperature. The cable is expected to operate fine at slightly higher temperatures for a time, but it may put undue strain on the end-splice, which may then trip and eventually fail.

How do turn on my thermostat unit?


To turn on your system once your thermostat has been installed, simply turn on the breaker. The thermostat screen will light up. After setting the basic parameters of the thermostat, select a steady temperature in manual mode for your first heating period to ensure the product heats up.

What if my thermostat says system is on however the floor is not heating up?


If you installed your thermostat over 3 years ago and it seems to be functioning the same, however your floor is no longer heating up, call your electrician. Click “Read More” for details.

Master/Relay (relay reading ER1)


When setting up a large installation and connecting two or more thermostats as Master and Relays, all devices MUST have a floor sensor hooked up. Click “Read More” for details. 

What if the Sensor Probe Reads Higher or Lower than Actual Temperature?


If the sensor probe is placed too close to the wire, it will read higher temperatures than you will actually feel on the floor. Click “Read More” for details.

Why can’t I program my thermostat to read air temperature?


If you have set the floor type to any kind of floating floor, a safety feature in the thermostat will not allow you to increase the target temperature any higher than 81 degrees. Click “Read More” for details. 

Why is my Floor Temperature Reading Incorrect?


If your floor probe is giving you a reading that is much higher or lower than the actual temperature of the floor, it is possible that your installer put the sensor probe and cold tail lead in the same conduit. Click “Read More” for details. 

Can my sensor probe be extended?


Yes, please click “Read More” for details.

“ER1 Out” Thermostat Reading on the Display


It indicates that the thermostat is not set up correctly. Click “Read More” for details.

Does the 3iE have a battery backup?


In the event of a power outage, the capacitor will hold the charge for approx 1 hour, after which time the device will require re-programming.

Un-Mounting Your Thermostat


Please click “Read More” for instructions on how to un-mount your thermostat

Output Fault Detected on the Display


It is likely to be a wiring or installation issue. Please consult our installation manual for further assistance. Troubleshooting steps will need to be done with a licensed electrician. Please have the electrician call us on site with the model numbers that were installed and a multimeter for testing.

Heater Error: What Does it Mean if my Thermostat Reads “Heater Error” on the Display?


Heater error will occur if the heating system is not properly wired to the thermostat. Please click “Read More” for details.

Is it Normal if my Thermostat Makes a Clicking Noise?


The clicking noises are the relay opening and closing to let the power through to the heating system. While it should be hardly noticeable, it can be reduced by insulating the surrounding of the electrical box in which it is mounted. You should also ensure that the screws mounting both the box and the thermostat are tight.

Can I Have Another Thermostat as an Acting Relay?


When you have multiple floor heating systems being powered that require more than 15amps, you can use an additional 3iE as a relay as opposed to purchasing a separate generic relay which Warmup can supply.

3iE Adjusting the time


If for some reason you need to change the time, do the following. Touch check under “wake.” Now the word “menu” will appear above the check. Touch it to begin. Next, touch the dash next to “settings.” Then, touch dash next to “time.” Touch dash next to “set time.” You will now be on the […]

3iE Making Temporary Temperature Adjustments


Your 3IE allows the ability to temporarily change the floor temperature setting for a specific period of time. You will first need to “wake” your thermostat by touching the checkmark on the front screen. Notice that above the up and down arrows you see “override.” Touch either arrow to begin adjusting the target temperature that currently appears.

3iE Basic temperature programming/Setting each day separately


The picture below shows the screen you will see if you are in the “Program Schedule” screen. If you had selected the option of “View/Edit” a program, you would have to start in that particular menu to eventually reach menu now being referenced.

Insulation Boards: Preparing for the Installation of Floor Heating


All surfaces should be thoroughly cleaned of all dirt and debris. When installing over an existing concrete base, it is important to remove all traces of existing finishes, contamination, etc. to allow for a clean surface.