Setting up a smart thermostat via the app – first launch and configuration

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Setting up a smart thermostat via the app – first launch and full configuration step by step

You have bought a WiFi or smart thermostat, came home, unpacked the box – and now you are facing a multi-page manual in five languages, with the Slovak one taking up three pages with postage stamp-sized images. I know this intimately. After years of working with heating technology and hundreds of customers calling in saying their thermostat "won't work," I can say one thing with certainty: most problems during the first launch of a smart thermostat are not hardware-related – they are configuration errors that you could easily avoid if you knew what to watch out for even before pressing the first button.

This article will guide you through the entire process – from physical preparation, through downloading the correct app, pairing with the network, setting up a schedule, all the way to verifying that the thermostat actually regulates heating as it should. The principles are the same for most devices on the market – even though the specific menus differ between manufacturers.

Before you set anything up: physical check and preparation

App configuration is just the last layer. If the thermostat is not physically installed correctly, no settings in the app will help. If you have not yet performed the installation, I recommend first reading our article Mounting a WiFi thermostat step by step – how to do it yourself, where the entire process of physical installation is described in detail.

We assume that the thermostat is mounted on the wall, the cables are connected, and the device at least lights up or displays some kind of screen. Before launching the app, double-check the following:

Thermostat power supply: either 230 V (hardwired), or batteries (most commonly 2× AA or 2× AAA). For battery-powered thermostats, insert new batteries – not old ones from the drawer. Weak batteries cause unpredictable behavior during WiFi pairing.
Type of relay: the thermostat must know whether it switches the boiler via "dry" relay contacts (most boilers), or directly via 230 V (older bimetal systems). This setting is usually a hardware switch or one of the first items in the installation menu.
WiFi network: the thermostat must be within range of your WiFi network. Most smart thermostats operate exclusively on the 2.4 GHz band – not 5 GHz. If you have a combined router (dual-band) and both bands share the same SSID, sometimes you need to manually switch your phone to 2.4 GHz during pairing.
Router is not in AP isolation mode: some routers have AP isolation enabled, which prevents devices on the network from communicating with each other. This can block pairing. Disable it in the router settings during installation.

Downloading the correct app – not all apps are the same

This is a step where surprisingly many people make a mistake. In both the AppStore and Google Play, there are several apps with similar names. The safest approach: scan the QR code from the thermostat manual – it will direct you directly to the correct app for the specific model. If the manual does not have a QR code, look for the exact app name – you will usually find it on the box or on the first page of the manual.

Examples of real-life situations:

Elektrobock PT32 GST – this model uses cloud communication via GSM and WiFi. The app is called "Elektrobock Smart" and is available for both Android and iOS. Note: with this model, a SIM card (GSM backup) is also required and registration on the manufacturer's portal is necessary before pairing with the device itself.
Emos P5623 – it works with the "GoSmart" app, which supports multiple Emos devices at once. If you have other Emos smart products at home (sockets, sensors), they will all be in the same app.

Some mid- to high-end thermostats use third-party platforms – for example, Tuya Smart or Smart Life. These platforms are proprietary cloud ecosystems that allow easy integration with Google Home or Amazon Alexa. More on this topic can be found in the article Integrating a WiFi thermostat with Google Home, Alexa, and smart home systems.

Account registration and first login

Most cloud-based smart thermostats require an account – an email registration or login via Google/Apple ID. Complete the registration before you go to the thermostat – it will save you time during pairing. When registering, pay attention to the following:

Region/server: Tuya-based apps (Smart Life, GoSmart) will ask you for a region. Choose "Europe" or "EU". If you select the wrong region (e.g. China), the device will pair, but latency will be higher and some features may not work properly. Changing the region later is possible, but inconvenient – usually you have to delete the device and pair it again.
Strong password: A smart thermostat controls your home heating system. Use a unique password – not the same as your email or social media accounts.
Email verification: some apps require email confirmation before you can add devices. Check your inbox right after registration.

Pairing the thermostat with the network – procedure and common issues

Pairing (also known as commissioning) is the most critical step in the entire process. There are two main methods for pairing WiFi thermostats:

EZ Mode (SmartConfig / AP Mode)

EZ Mode works by having the app on your phone broadcast network credentials (SSID + password) into the air, which the thermostat "catches". Your phone must be connected to the same 2.4 GHz network to which you want to connect the thermostat during this process. Procedure:

In the app, tap „Add Device" and select the category „Thermostat" or „Heating".
The app will prompt you to put the thermostat into pairing mode. This usually means pressing and holding the button on the thermostat for 3–5 seconds or using a combination of buttons as per the manual.
The thermostat signals pairing mode with a blinking WiFi icon or an audio signal.
Enter the WiFi password into the app and confirm.
Wait 30–60 seconds. The app will confirm a successful pairing, and the thermostat will display a solid WiFi icon.

If EZ Mode does not work after two attempts, switch to AP Mode.

AP Mode (Access Point Mode)

In AP Mode, the thermostat itself creates a temporary WiFi network (usually named „SmartLife-XXXX" or „GoSmart-XXXX"). You connect your phone to this network, and the app automatically configures and sends the thermostat your home network details. The process is one step longer, but more reliable – especially in households where the router has various security settings.

Basic configuration after pairing – what to set first

The device is paired, the app sees it, and the thermostat displays the current temperature. Now comes the era of settings. The order in which you perform them makes sense – some settings affect others.

1. Setting the date, time, and time zone

Smart thermostats connected to the cloud synchronize time automatically from the internet – manual synchronization is not required. Nevertheless, check that the thermostat shows the correct time and that it has the correct time zone set (Europe/Bratislava, UTC+1 / UTC+2 daylight saving time). An incorrect time zone setting is sneaky – the thermostat appears to function, but the boiler turns on an hour earlier or later than it should.

For models without permanent internet connection (e.g., hybrid GSM/WiFi devices like Elektrobock PT32 GST), time is synchronized via the mobile network – which is a more reliable backup, as it works even during internet outages.

2. Heating system type (Heating Mode)

This setting tells the thermostat what it actually controls. Most apps offer:

Heating only – heating only (gas boiler, heat pump)
Cooling only – cooling only (air conditioning)
Heating + Cooling – combined system

For Slovak households with a gas boiler, choose „Heating only". If you have a combined unit (e.g., an air-to-air heat pump with cooling function), choose the combination. More about compatibility with different types of heating can be found in the article With what boiler power and heating type does a WiFi thermostat work.

3. Hysteresis (Dead Band)

Hysteresis determines how many degrees the temperature can drop below the set value before the thermostat turns on the boiler, and how much it must rise above the set value before it turns it off. A typical value is 0.5 °C on each side (i.e., total hysteresis of 1 °C). Example: you set 20 °C – the boiler turns on at 19.5 °C and turns off at 20.5 °C.

Why is this important? Too small hysteresis (e.g., 0.1 °C) causes so-called boiler short cycling – the boiler turns on and off every minute, which wears it out. Too large hysteresis (e.g., 2 °C) means the room temperature fluctuates within a 4 °C range – which is not comfortable. For most households, the optimal is 0.3–0.5 °C.

4. Temperature limits

Set the minimum and maximum temperature that the thermostat can set. Typically:

Minimum temperature: 5 °C (frost protection, do not set below 5 °C for regular living)
Maximum temperature: 30 °C (setting higher may cause overheating errors)

These limits apply to manual control directly on the thermostat – they prevent, for example, children from setting the temperature to 35 °C.

Setting up the weekly schedule

This is the core of the entire smart thermostat. A well-configured schedule can save you 15–25 % on heating costs compared to a manual thermostat – and that without having to change anything every day. The article How much can I save on heating with a WiFi thermostat – real numbers and experiences goes into depth with actual figures.

Most smart thermostats offer a schedule in one of three formats:

5+2: one schedule for workdays, another for the weekend. Simple, suitable for families with a regular routine.
6+1: one schedule from Monday to Saturday, another on Sunday.
7×1: each day has its own schedule. Most flexible, recommended for households with an irregular routine (working from home some days, rotating shifts).

Example of a realistic schedule for a family with children

A family with two children at school, both parents working outside the home until 16:00–17:00:

06:00–07:30 – Comfort temperature 21 °C (morning, waking up, breakfast)
07:30–16:00 – Economy temperature 17 °C (empty house)
16:00–22:00 – Comfort temperature 21 °C (at home)
22:00–06:00 – Night temperature 18 °C (sleeping)

Difference between 21 °C and 17 °C: every additional degree increases consumption by about 6 %. With 8.5 hours of daily temperature reduction (255 hours per month), savings can reach up to 20–25 % compared to constant comfort temperature. These are real numbers for an average family home with a gas boiler with an annual gas consumption of 1 500–2 000 m³.

Important practical tip: do not leave the preheating window too long. The thermostat starts the boiler at the time you set – it does not start it automatically with an early start unless there is a special Early Start function (sometimes called „Adaptive Start"). If you want to have 21 °C at home at 16:00 and the house heats up in 45 minutes, set the schedule to 15:15. If the thermostat has an Adaptive Start function, enable it – the thermostat measures how quickly the house heats up and gradually adjusts the start time.

Advanced settings – what the hidden menu hides

Calibration of the temperature sensor

Every thermostat measures temperature with its own accuracy. In most apps, it is possible to set a sensor offset – typically in the range of -5 to +5 °C, in steps of 0.5 °C. How do you find out if correction is needed? Place an accurate reference thermometer (e.g. a certified digital room thermometer) next to the thermostat and leave it there for an hour. If the thermostat shows 21.5 °C and the reference thermometer shows 20.0 °C, set the offset to -1.5 °C. The thermostat will then display the actual temperature.

Why are deviations so common? The thermostat is mounted on the wall and nearby thermal bridges, position near a radiator, interior lighting – all of these affect the measured temperature. In the model Emos P5623, the offset can be set directly in the GoSmart app in the „Device Settings" section.

Frost protection

Even if you set the thermostat to „off" or „vacation" mode, frost protection ensures that the temperature in the apartment never drops below the set minimum (usually 5 °C). This function should always be enabled – especially in the case of floor heating, where freezing could cause serious damage.

Keyboard lock (Child Lock)

The physical buttons on the thermostat can be locked – changes are then only possible via the app. Suitable not only for households with children, but also for rented properties, where you do not want tenants to change the schedules.

Push notifications and alerts

Set up alerts for critical situations:

Temperature drops below X °C (e.g. 8 °C – signal of heating failure)
Temperature rises above X °C (e.g. 26 °C – open window during heating)
WiFi connection loss of the thermostat

These notifications are especially valuable for a cabin, rented property or elderly parents living alone – you can see from afar whether the temperature in the house is normal.

Verifying the correct setup – how to tell that the thermostat is regulating correctly

This is a step most people forget. After completing the configuration, sit for 15 minutes next to the thermostat and observe:

Boiler on test: set the desired temperature 3–4 °C higher than the current room temperature. The thermostat should engage the relay within 30 seconds (you will hear a soft click) and the boiler should start. If this does not happen, check the relay output wiring and signal type (open/closing contact).
Boiler off test: set the temperature back to the current or lower. The thermostat should disengage the relay within 30 seconds and the boiler should stop.
History in the app: most apps show temperature and relay activity graphs for the last 24 hours. Check whether the on/off cycles match your expectations and whether hysteresis is working correctly.

If the thermostat does not start the boiler even with a large deviation from the set temperature, the problem is usually in one of these: incorrect relay contact type (NO vs. NC – Normally Open vs. Normally Closed), incorrect wiring or incorrect heating system type setting in the app. Detailed troubleshooting can be found in the article WiFi thermostat not working or not connecting to the internet – common causes and solutions.

Working with multiple zones and multiple thermostats

In the case of a larger house or apartment with multiple rooms, you can manage several thermostats at once in the same app. Each thermostat functions as a separate zone – it has its own schedule, its own set temperature, and its own history. This is a major advantage over single-zone control: you don't have to heat the entire house to the same temperature when some rooms are not being used.

Example from real-world practice: a three-story house, where the basement is a workshop used only on weekends. The basement thermostat is set to 13 °C during the week and 19 °C on weekends. Just by doing this, an estimated 8–12 % of the annual gas consumption was saved – without any investment in new equipment, just by better settings.

Firmware update right after pairing

Right after a successful pairing, the app usually notifies you of a firmware update availability. I recommend installing it immediately – new firmware fixes security vulnerabilities, improves WiFi connection stability, and sometimes adds new features (e.g., better integration with voice assistants). The whole update process takes 2–5 minutes, the thermostat restarts, and returns to normal operation. During the update, do not interfere with its operation – if it is currently winter, a short period of regulation downtime is not a problem, the boiler will operate according to its own thermostat (or remain in the last state).

You can read more on this topic in the article How to maintain and update the firmware of a smart thermostat.

Most common errors during the first setup – from real-world practice

Over years of sales and technical support, I have seen hundreds of cases. Here are the most common errors users make:

5 GHz network instead of 2.4 GHz: the thermostat will not pair at all, the app reports an error without further explanation. Solution: switch your phone to the 2.4 GHz network during pairing.
Wrong region during registration: the device works, but slower and some features are missing. Solution: delete the device, change the region in your account, and pair again.
Outdated app: an older version of the app may not support new models or has pairing issues. Always use the latest version.
Missing email verification: the registered account is not verified, so it is not possible to add devices. Check your spam folder.
Incorrect contact type setting (NO/NC): the boiler runs constantly or does not start at all. This is a serious error with consequences – check the boiler and thermostat documentation.
Forgotten temperature offset: the thermostat regulates to a temperature that differs from the actual one. Calibrate it using a reference thermometer.

Security and privacy when using cloud-based thermostats

A smart thermostat sends data about your household to the manufacturer's cloud server – when you are at home, when you are heating, what temperature you have. For most people, this is not a problem, but it is good to know where this data is. Read the manufacturer's privacy policy (available in the app). For increased security:

Use a strong and unique password for your app account.
Enable two-factor authentication (2FA), if the app offers it.
Do not expose the thermostat directly to the internet via port forwarding – cloud communication is more secure.
Regularly update the firmware – security patches are the number one reason for updates.

Frequently asked questions (FAQ)

Why does the thermostat disconnect from WiFi after pairing?

The most common reason is a weak WiFi signal – the thermostat is at the edge of the router's range. The solution is a WiFi extender (repeater) or moving the router. Another possible cause is the "WiFi sleep mode" setting on the router, which disconnects devices that have been inactive for a long time. Disable this function in the router settings. If the problem persists, read the detailed guide in the article WiFi thermostat does not work or connect to the internet – common causes and solutions.

Can I control the thermostat when I am away from home without WiFi?

Yes – for remote control, you need a data connection on your phone (mobile data or WiFi anywhere). The thermostat communicates with the manufacturer's cloud, not directly with your phone. As long as the thermostat is connected to the home WiFi and your phone has internet access anywhere, control works from anywhere in the world. The exception is an internet outage at home – in that case, the thermostat continues according to the last set schedule, but remote changes are not possible. A hybrid model like Elektrobock PT32 GST is an advantage here, as it has GSM backup via SMS.

Does the app require location permissions – is it necessary?

Yes, on Android, location permission is technically necessary for scanning WiFi networks during pairing (Android requires it from version 6.0). You can revoke this permission after pairing – normal thermostat control does not require location. On iOS, the situation is different and most apps do not require location.

Can I control one thermostat from multiple phones (e.g., the whole family)?

In most cloud systems (Tuya, GoSmart, Elektrobock Smart), there is a device sharing feature. The primary account owner invites other family members – they create their own account and get access to the thermostat with limited or full permissions. Sharing the password to the main account is not required.

What happens to the thermostat during a power outage?

After power is restored, the thermostat automatically restarts and loads the schedule from its own memory – the schedule is stored locally, not only in the cloud. Time is synchronized from the internet. The thermostat therefore continues to function correctly after short outages. During a longer outage (hours), some models return to manual mode with the last set temperature.

Is it possible to integrate the thermostat into a smart home system (Home Assistant, Apple HomeKit)?

It depends on the model. Thermostats on the Tuya platform can be integrated into Home Assistant via local integration (Local Tuya) or cloud integration. Apple HomeKit does not support them directly without an additional bridge (e.g., Homebridge). Google Home and Amazon Alexa are natively supported by most current models. The topic of integrations is covered in the article Integration of WiFi thermostats with Google Home, Alexa, and smart home systems.

Conclusion: configuration is not a one-time task

Setting up a smart thermostat for the first time will take you 30–60 minutes if you proceed systematically and have everything prepared. But this is just the beginning. A smart thermostat is a device that is worth continuously optimizing – changing schedules according to the season, monitoring consumption history, updating firmware, and possibly adding more devices to the same ecosystem. The time invested in proper configuration pays off in lower energy bills and comfort, when your home heats up exactly when you need it – without you having to think about it.

If you are still deciding which model to choose, I recommend reading the article How to choose a WiFi thermostat – what to pay attention to before buying, where key parameters and comparisons are summarized. And if you are considering whether a WiFi or GSM solution is more suitable for your situation, the answer can be found in the article WiFi vs. GSM thermostat – what is the difference and which one is worth it.

Do you have a question on this topic?

Still undecided or dealing with a specific situation in your household? Write to us – we are happy to help.