4iE Smart WiFi Thermostat
The Warmup 4iE Smart WiFi Thermostat is a programmable thermostat for electric underfloor heating systems. WiFi models can be remotely controlled through the MyHeating app, which includes SmartGeo location-based heating control and daily energy usage tracking. The 4iE carries a 3-year warranty. The FAQs below cover installation, wiring, programming, troubleshooting, and more.

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1 Can I add a 4iE and a 6iE on my MyHeating account?
Yes! All smart thermostats by Warmup are compatible with the MyHeating app for easy control of your underfloor and electric baseboard heating.
Learn more2 Can the 4iE be connected to Samsung Home?
The 4iE can be connected to Samsung Home via IFTT.
Learn more3 Can the MyHeating app have multiple users?
It’s possible to ‘share’ a location with another user. This is done through the web portal in the ‘edit location’ section. Here, the user can add more users to their location. Invitation access is sent…
Learn more4 How do I change my password using the MyHeating app?
In this guide, we will provide you with instructions on how to change your password using the MyHeating app. Whether you prefer following a video tutorial or written instructions, we have got you covered. Changing…
Learn more5 How do I change the language using the MyHeating app?
There are two ways to change the language using your MyHeating app.
Learn more6 How do I set a program using the MyHeating app?
This guide will walk you through the process of setting up and programming your MyHeating app to ensure maximum comfort and energy efficiency in your home. Setting a program allows you to set comfort temperatures…
Learn more7 How do I set the time and date on my thermostat?
Setting the time and date on your thermostat is a crucial step in ensuring the proper functioning of its programming features. Accurate time and date settings allow your thermostat to regulate temperature and energy usage…
Learn more8 How do I upload a custom background to my 4iE?
The 4iE® is offered in White & Black. It is designed to look great in both modern and traditionally styled homes, with glass effect front faces and beveled chrome edges to reflect wall colors.The large color…
Learn more9 How does the open window function on my Smart Thermostat work?
The open window function is a setting on your thermostat that will detect when a nearby window is open, letting in outside air and will adjust the temperature accordingly. TRIGGER ON: A Windows open…
Learn more10 How to check my daily usage through the MyHeating app?
In this guide, we will take you on a journey to explore the powerful Daily Usage feature of the app, specifically designed for your Warmup 6iE/4iE thermostat. By following these instructions, you will unlock the…
Learn more11 How to open the main menu
Want to know how to open the main menu the 4iE thermostat? This post will tell you how and link you to other topics that you may find useful.
Learn more12 How to perform a manual override using the MyHeating app?
We will guide you through the step-by-step process of accessing the manual override function through the MyHeating app. You'll learn how to make real-time changes to the temperature, switch between heating modes, and even create…
Learn more13 How to turn on frost protection using the MyHeating App?
In this guide, we will walk you through a simple process to deactivate the SmartGeo feature, turn off the heating, and disable the frost protection on your device. By following these instructions, you will have…
Learn more14 Internet to 4iE: How to connect the 4iE to the Internet?
Warmup 4iE thermostats come with or without WiFi capability. If you have a 4iE with WiFi capability and the home screen shows internet bars with an X above, this indicates that your 4iE internet connection…
Learn more15 What are the dimensions of the 4iE custom background image?
The 4iE custom background screen is 320 x 240 px. Click to learn more about the custom 4iE background image and it's scaling.
Learn more16 What is the lock icon on the 4iE Smart Thermostat?
The lock icon on the 4iE Smart Thermostat represents that the thermostat has gone into standby mode. It will show at the bottom center of your thermostat.
Learn more17 How do I cancel an override?
Want to cancel an override that you made on your 4iE thermostat? This post will tell you and show you in a short video clip.
Learn more18 What does cancel heating off mean?
Wondering what the words "cancel heating off" mean on your 4iE home screen? This post will explain its meaning to you to make thermostat usage easier.
Learn more19 How do I connect my 4iE to WiFi?
Wondering how to connect your 4iE Smart WiFi thermostat to WiFi? this post includes a video clip showing how and written instructions.
Learn more20 What is a setback temperature and how do I set it?
Are you wondering what a setback temperature is on the 4iE smart thermostat? You can learn all about it here and how it is used.
Learn more21 How can I adjust the thermostat temperature temporarily?
A temporary temperature adjustment on the 4iE is called an override. Overriding will allow you to make temperature adjustments without re-programming the entire thermostat. To start an override on your 4iE follow the below video…
Learn more22 How do I set the time and date on the 4iE?
Wondering how to set the time and date on your 4iE thermostat? You can learn how to here from a short video or discription.
Learn more23 How can I tell AM from PM on the 4iE?
Wondering how you can tell AM and PM on the 4iE thermostat? Learn how here.
Learn more24 What is a fixed temperature and how to I set or change it?
Are you wondering what a fixed temperature is on your smart thermostat? Learn here about this program and how to change it.
Learn more25 How do I find the MAC address of the thermostat?
Looking for the MAC address of your thermostat? Learn where to find it here.
Learn more26 How do Warmup thermostats work?
Wondering how Warmup thermostats work? Learn all about how they work by reading more here.
Learn more27 How do I register a 4iE Thermostat?
Looking to register a 4iE thermostat? Find all the instructions you need here to get up and running.
Learn more28 How do I enter a space in my WiFi Password on the 4iE?
If you are attempting to connect your 4iE to WiFi and your password has a space you may be wondering how to enter it. For a quick answer, click here.
Learn more29 What are heating limits?
Heating limits are commonly referred to when it comes to underfloor heating. If you are wondering what heating limits are and how to manage them.
Learn more30 How to: Initial 4iE Programming
In this 4iE programming guide, you will find several useful videos and written instructions. Initial programming is important to get the most from your 4iE.
Learn more31 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.
Learn more32 How do I get into my thermostat if I forgot the password?
The 4iE thermostat has a lock feature. If you have locked your thermostat and can not get back in, this post will help you!
Learn more33 Control of Baseboard Heaters by the 4iE
This page explains how to wire and program the 4iE thermostat to work with baseboard applications.
Learn more34 Should I perform a Reset or Power Cycle my 4iE?
First, loosen the screws at the bottom of your unit at shown in the video clip below. Then remove the face of your thermostat by lifting up and off. On the back of the face…
Learn more35 What Type of WiFi Does the 4iE Use?
Click "Read More" for details.
Learn more36 What is System Power on my 4iE and how can I edit it?
System Power is requested during the initial setup of your device. System power is simply the wattage of the heating system that you connect to your thermostat. To set your systems power select the following:…
Learn more37 Where Do I Find my 4iE’s Device Number?
First, the device number shows up during the initial startup menu and recommends the number be written down. Secondly, it can always be accessed afterwards on the device itself.
Learn more38 How Do I Enable to SmartGeo Feature on the MyHeating App?
The Warmup SmartGeo is a way to allow your thermostat to combine the location settings on your device, occupancy sensing features and a few algorithms to create the most comfortable heat as efficiently as possible.
Learn more39 How to Set Up a Program Using the MyHeating App
Once your profile and 4iE are registered, you can now set up or edit a program through the MyHeating App. Note: You can set multiple different programs for different days. Refer the the video below…
Learn more40 Does the 4iE have a Battery Backup?
There is no battery backup or capacitor in the 4iE, however, there is internal memory. Periodically the programming and date/time are stamped to a section of internal memory. This is then overwritten when the next…
Learn more41 Why won’t my background picture upload on my 4iE?
This post explains the size requirements of the image file you are trying to upload as a 4iE background.
Learn more42 Can I swap my 3iE to a 4iE or Tempo?
Yes. The box and mounting requirements are identical for all horizontal Warmup thermostats and the sensor is compatible. If you'd like to swap a 3iE for a 4iE or Tempo thermostat you will need to…
Learn more43 Can I upgrade to the 6iE?
Do you have an old Warmup thermostat that you'd like to upgrade to the 6iE? Learn all you need to know in this post.
Learn more44 Can my sensor probe be extended?
Yes, please click "Read More" for details.
Learn more45 How do I check if the cable is working ?
The only way to see if the cable is going to work and is not damaged is to use an ohmmeter to check the resistance between the heating conductors matches what it should be in…
Learn more46 Thermostat Mounting
Are you installing a Warmup thermostat and looking for mounting information? Find the mounting diagrams you need here in this post.
Learn more47 Can you trim the floor sensor?
The floor probe wire can be trimmed. Learn more here.
Learn more48 How do I register a product warranty?
If you are finalizing a Warmup installation it is almost time to register your warranty! Find the link here to the warranty registration page.
Learn more49 How is the 4iE wired?
We hope that the below clip will assist in wiring your 4iE thermostat. For wiring diagrams please see the product literature. https://www.youtube.com/watch?v=g13w0AmAe6s Related questions: https://warmupedia.warmup.com/questions/initial-4ie-programming/ https://warmupedia.warmup.com/questions/how-long-will-my-system-take-to-heat-up/
Learn more50 Can I mount my thermostat anywhere?
If you have quesitons about where to mount your warmup thermostat you can find answers to that question and more here.
Learn more51 Mounting a 3iE/4iE thermostat in Canada
In order to properly mount your 4iE thermostat, you will need a back-box as well as a mud-ring. Warmup can recommend compatible items.
Learn more52 How Do You Add a Room using the MyHeating App?
There are two ways to add a Room to your account, which will serve as a way to register your 4iE thermostat to your profile. The first way is through the my.warmup.com profile and the…
Learn more53 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.
Learn more54 Make sure that the floor probe that came with the floor heating thermostat was installed and done so properly.
It is vital that the floor heating thermostat's floor probe was not only installed but done so the right way. Click "Read More" for details.
Learn more55 Can baseboard heaters be controlled by the 4iE?
This page explains how to wire and program the 4iE thermostat to work with baseboard applications.
Learn more56 How many relays can a single thermostat control?
If you are planning for a large project, Warmup recommends limiting the number of relays controlled by a single thermostats to 5.
Learn more57 Can I use the 4iE with another type of heating?
Are you wondering what kind of heating you can connect the 4iE thermostat to? Learn the answer to that question here in this post.
Learn more58 How far away from the thermostat can the relay be mounted?
Are you wondering about the mount location of your relay? Learn more about mounting your relay in this post.
Learn more59 Can multiple relays be used?
Do you have a large project that you'd like to use multiple relays for? Learn more about connecting more than one relay in this post.
Learn more60 Can I use the 4iE to control my Air Conditioning unit (A/C)?
The 4iE is designed for use with heating only and is not capable of controlling air conditioning units.
Learn more61 Can my thermostat connect to Google Home?
Yes, your thermostat can connect to your Google Home. Read the instructions down below to find out how!
Learn more62 How can I turn my system on or off completely?
Powering off your thermostat is an important function to be familiar with, as it allows you to completely shut down your system when needed. Whether you prefer visual guidance or step-by-step instructions, we have you…
Learn more63 How Do I Identify Which Warmup Thermostat I Have?
Do you have a Warmup Thermostat but are unsure which model you have? Read this post to help identify which model you have installed.
Learn more64 Is an electric floor heating thermostat the same as regular thermostats?
No, floor heating thermostats are specifically designed to control electric floor heating systems.
Learn more65 When I push the test monthly button on my thermostat, the screen goes red and tells me to call Warmup. Should I be worried?
Not at all. Click "Read More" for details.
Learn more66 Why does my thermostat read a percentage (Regulator Mode)?
When applied, you will select a number and this percentage represents the number of minutes the heat will be on out of every 10 minute cycle. For example, if you select 60%, the heat will…
Learn more67 Why does my thermostat set into open window function and decreases my set temperature?
Welcome to our informative post on learning more about the open window function on your Warmup Smart Thermostat. Follow along down below to read more about this function.
Learn more68 How do you update software on a 4iE thermostat?
Looking to update the software on your 4iE thermostat? This post will tell you all about software updates and how they work.
Learn more69 How to change the location setting on the 4iE?
Notice your weather report on your smart thermostat is off? Find out here how to confirm your location is properly set.
Learn more70 Do I need to use the WiFi on my smart thermostat?
Are you wondering if an internet connection is necessary for the 4iE-04 to work? Learn more here about whether or not it is necessary to connect to WiFi.
Learn more71 Why is my thermostat screen going dark?
Is your 4iE screen going dark? Learn more here about the settings on the 4iE and how they can be easily changed to your preference.
Learn more72 How to Unregister your 4iE Thermostat
Moving or expecting new renters? Learn how to unregister your 4iE thermostat so that the new owners or renters can utilize the units WiFi capabilities.
Learn more73 How to Edit Currency Type on your 4iE thermostat
Is your energy monitoring feedback in the wrong currency? Learn how to easily edit the currency type on your 4iE thermostat.
Learn more74 How to switch from Celsius to Fahrenheit (or vice versa) on your 4iE thermostat
Is your thermostat reading in Celcius when you want it in Fahrenheit or the other way around? Follow these easy steps for switching the temperature format.
Learn more75 How to Edit Energy Cost on your 4iE thermostat
Do you need to edit something about your energy monitoring feedback on the 4iE? Learn how to easily edit these settings here.
Learn more76 4iE Features Only Available through the MyWarmup Portal
Some features are currently only available through the MyWarmup portal. Click "Read more" to see which ones.
Learn more77 Does Warmup Underfloor Heating Comply with Title 24?
The California Title 24 Building Energy Efficiency Standards are designed to ensure new and existing buildings achieve energy efficiency and preserve outdoor and indoor environmental quality. We have included below useful information regarding underfloor heating…
Learn more78 Can my thermostat connect to Alexa?
To connect, please make sure you have downloaded the Alexa App and that your Amazon device is fully registered and connected to the Wi-Fi. In addition, you will need to make sure that your my.warmup.com…
Learn more79 How do I turn off the Backlight on my 4iE Thermostat?
Follow these steps to turn off the backlight feature: Menu > Settings > Display/Audio > Display Brightness > Standby set to '0' > Accept
Learn more80 Connected to the internet and getting the “!” message on 4iE Thermostat?
Ensure you have created your account and registered the thermostat using the Device Number. Click "Read More" for details.
Learn more81 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.
Learn more82 If I’ve Registered an Account, Why Does my 4iE Still Have an ‘!’ on the Screen?
It could also mean that your thermostat is connected to the internet but you have not registered the device as a room on the myheating app or the my.warmup portal. In this instance, you will…
Learn more83 Is it normal if I hear a clicking noise from my thermostat?
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…
Learn more84 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…
Learn more85 What does it mean if my thermostat reads “overload” on this display?
The overload message will occur if more than 15 AMPS has been connected to the thermostat. Click "Read More" for details.
Learn more86 What does the ‘!’ mean on my 4iE Screen?
This may also mean that you have not yet registered the actual thermostat under your location as a room. Please make sure you have added a room, which requires you to enter the thermostats unique…
Learn more87 Why is my floor heat not working even though there are no error messages on my thermostat?
Discover why your floor heat is not working despite there being no error messages showing on your thermostat. This guide explains common causes of heating issues and troubleshooting tips to restore your system.
Learn more88 Why is my floor temperature reading incorrect?
If your floor temperature reading varies significantly from the actual temperature of the floor, it could indicate an issue with how the sensor probe was installed. Continue reading to learn how to identify and fix…
Learn more89 Why is my thermostat flashing?
Is your thermostat display flashing? We'll be happy to help get you on the right track in this quick post.
Learn more90 Why Won’t My 4iE Connect to the Internet?
Check you are using a WPA2 password format (less than 10 characters) on your network. Click "Read More" for details.
Learn more91 How do I perform a GFCI Test on my thermostat?
Do you need to test the GFCI on your Warmup thermostat? This post will provide the directions needed for performing this test.
Learn more92 Why does my thermostat say test monthly?
Are you wondering why your thermostat says test monthly? Wondering what you should do? Learn all of that and more in this post.
Learn more93 What can I do if my old thermostat has stopped working?
Does it appear that your old thermostat has stopped working? Learn more here about what you can do next to get your floors warm again.
Learn more94 Why is my thermostat display sideways?
Is your thermostat screen displaying in the wrong direction? We're sorry for the inconvenience. Click here for support to get this issue solved.
Learn more95 Why wont my thermostat hold information?
Are you finding that your thermostat is not holding your changed settings? Try this quick fix for getting your thermostat settings saved.
Learn more96 Why is my thermostat stuck on the Warmup screen?
Is your thermostat stuck on the Warmup screen? To advance you'll want to confirm a few details found in this useful post.
Learn more97 How do I conduct a floor probe test?
If you believe that your floor probe readings are inaccurate or if you are getting an ER1 message, you may want to test your floor probe. Learn how-to here.
Learn more98 ER1 on the Thermostat Meaning
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…
Learn more99 Why is my 4iE Showing an ‘!’ on the Screen?
Ensure you have created your account and registered the thermostat using the Device Number. Click "Read More" for details.
Learn more100 Where do I place the sensor probe when installing in-slab cable?
The thermostats sensor probe can be installed in a number of ways and must be housed in a separate conduit from the heating systems cold tail lead. Click "Read More" for details.
Learn more101 My Floor Heating System Keeps Tripping
The GFCI in thermostats are Class A, which means below 5mA trip levels. This is a very sensitive trip level required by UL. There are several instances that could cause “spurious tripping” or “nuisance tripping”…
Learn more102 Do Warmup thermostats zone?
If you are looking to heat multiple spaces separately, you will require multiple thermostats. Read more in this post about zoning.
Learn more103 Does every room with floor heat need its own thermostat?
Want to learn more about the thermostat requirements for floor heating? This post explores several factors you should consider.
Learn more104 How to Set a Weekly Heating Schedule on Your Warmup Thermostat
Learn how to both set and delete a weekly programming schedule on your Warmup 7iE Smart Thermostat.
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