- HVAC
- Smart thermostats
SIMBOLO-SINCRONIZANDO
tado Thermostat SIMBOLO-SINCRONIZANDO: changes not synced
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The synchronizing symbol on a tado° heating device means a setting change has not yet been transmitted to other tado° devices in the same room; wait a few minutes, and if it stays on for more than 30 minutes, restart the devices in that room.
Safety first
Stop and check this first
- When restarting a Smart Radiator Thermostat by removing the batteries for 10 seconds, always wait 1 full minute after reinserting the batteries before remounting the device onto the radiator so calibration succeeds.
- Do not factory-reset or unpair your tado° room devices as soon as you see the synchronizing icon: tado° recommends waiting up to 30 minutes before even performing a standard restart.
Safe checks you can perform
- Wait a few minutes and check Settings > Rooms & Devices if it lasts over 30 minutes
- Restart the Smart Thermostat or Wireless Temperature Sensor (10-second button hold)
- Restart the Smart Radiator Thermostat (remove batteries for 10 seconds) and Internet Bridge
Leave these tasks to a qualified professional
- Do not attempt this professional task: Contact tado° support if the synchronizing symbol persists after restarting room devices
- Do not attempt this professional task: Have a technician relocate the Internet Bridge if room radio coverage drops repeatedly
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Contact tado° support if the synchronizing symbol persists after restarting room devices
What they dotado° support inspects the room device grouping and radio link logs when restarting the room devices and Internet Bridge after 30 minutes does not clear the icon.
They must show youthe list of devices grouped in that room under Settings > Rooms & Devices and which device screen keeps displaying the synchronizing icon.
In writingthe tado° support conversation reference, the serial numbers of the devices in that room, and the radio link diagnostic outcome.
Have a technician relocate the Internet Bridge if room radio coverage drops repeatedly
What they doA network technician provides a more central Ethernet and power location for the Internet Bridge if distant rooms repeatedly lose radio sync.
They must show youstable online status for every device in that room under Settings > Rooms & Devices when adjusting target temperatures.
In writingthe updated Internet Bridge placement details and confirmation that room changes sync within minutes.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Wait a few minutes and check Settings > Rooms & Devices if it lasts over 30 minutes
- Who:
- you, watching the device display and checking the tado° app.
- How:
- allow a few minutes after changing the temperature, as tado° states the issue usually resolves on its own; if the symbol remains after 30 minutes, check Settings > Rooms & Devices to see if any device in that room or the Internet Bridge is offline.
- Result that matters:
- verify whether the pending room change syncs automatically or if a device is offline.
- If the synchronizing icon clears and all devices in the room show the updated target temperature:
- room synchronization is complete.
- If the synchronizing symbol is still visible after 30 minutes:
- restart the affected room devices in the next steps.
- Evidence to keep:
- screenshot of Settings > Rooms & Devices showing the devices assigned to that room.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean?
Restart the Smart Thermostat or Wireless Temperature Sensor (10-second button hold)
- Who:
- you, pressing the button on the Smart Thermostat or Wireless Temperature Sensor.
- How:
- press and hold the button on the Smart Thermostat or Wireless Temperature Sensor for 10 seconds until the display turns off; when you release it, the tado° logo appears and the device restarts.
- Result that matters:
- refresh the radio session between the thermostat or temperature sensor and the Internet Bridge.
- If the two-arrows synchronizing symbol clears after rebooting and room settings update:
- issue resolved.
- If Smart Radiator Thermostats in the same room still show the synchronizing icon:
- restart them in the next step.
- Evidence to keep:
- photo of the tado° logo during the restart and the display afterward.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean? · How can I restart my tado° devices?
Restart the Smart Radiator Thermostat (remove batteries for 10 seconds) and Internet Bridge
- Who:
- you, on the Smart Radiator Thermostat and the Internet Bridge.
- How:
- unmount the Smart Radiator Thermostat, remove its batteries for 10 seconds, reinsert them, close the compartment, and wait 1 minute before remounting it on the radiator so it calibrates; if multiple rooms are affected, also hold the Internet Bridge button for 10 seconds (or unplug power for 10 seconds).
- Result that matters:
- reboot and recalibrate the Smart Radiator Thermostat and refresh the Internet Bridge radio link.
- If calibration completes and the synchronizing icon clears across all devices in the room:
- normal operation restored.
- If the synchronizing symbol still remains 30 minutes after restarting the devices:
- contact tado° support.
- Evidence to keep:
- time of the device restarts and the serial numbers of the devices in that room.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean? · How can I restart my tado° devices?
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- tado°
- Product type
- Smart thermostats
Known code variants
- Círculo giratorio Cabezal Termostático Inteligente tado
- Dos flechas opuestas Termostato Inteligente tado
- Rotating circle Smart Radiator Thermostat tado
- Símbolo de sincronizando tado
- Sincronizando tado
- Synchronizing icon tado
- tado Synchronizing symbol
- Two arrows symbol Smart Thermostat tado
What it means
In tado°'s official Help Center for V3+ and earlier heating devices, the synchronizing symbol varies by model: two opposite horizontal arrows on the Smart Thermostat and Wireless Temperature Sensor, a rotating segmented circle on the Smart Radiator Thermostat, and a wrench icon on the Smart Radiator Thermostat Basic. It appears when multiple tado° devices in the same room cannot transmit a setting change right away. Seeing this icon alone never proves that your thermostat or radiator valve is faulty: it is usually a brief radio drop to the Internet Bridge that resolves within minutes.
Warnings and stop conditions
- Loweditorial warning
When restarting a Smart Radiator Thermostat by removing the batteries for 10 seconds, always wait 1 full minute after reinserting the batteries before remounting the device onto the radiator so calibration succeeds.
Evidence: How can I restart my tado° devices?
- Loweditorial warning
Do not factory-reset or unpair your tado° room devices as soon as you see the synchronizing icon: tado° recommends waiting up to 30 minutes before even performing a standard restart.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean?
Symptoms and causes
Probable causes · in order
- Temporary radio connection drop to the Internet BridgeCommon
tado° identifies a temporary interruption in the radio connection with the Internet Bridge as the most common reason changes are not immediately synced across room devices.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean?
- Another tado° device in the same room is offline or has depleted batteriesPossible
When a room contains multiple Smart Radiator Thermostats paired with a Smart Thermostat or Wireless Temperature Sensor and one device goes offline, room updates remain pending.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean?
- Synchronizing state stuck for more than 30 minutes after a connection dropLess common
If the synchronizing symbol stays visible for over 30 minutes, one of the room devices or the Internet Bridge requires a local restart to refresh its radio session.
Evidence: My tado° heating device shows the synchronizing symbol. What does this mean? · How can I restart my tado° devices?
Virtual technician
Does SIMBOLO-SINCRONIZANDO still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
My tado° heating device shows the synchronizing symbol. What does this mean?
tado° · 2026 · official_doc
- 3
How can I restart my tado° devices?
tado° · 2026 · official_doc
- 4
¿Cómo puedo reiniciar mis dispositivos tado°?
tado° · 2026 · official_doc
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