Tado
Tado Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Smart thermostat shows E01 and cannot connect to the Internet; app reports device offline.
Internet Bridge Network Connectivity Failure
E02
Smart thermostat or Smart Radiator Thermostat shows E02 and cannot connect to the Internet Bridge.
Radio Link Failure to Internet Bridge
E03
Smart thermostat displays E03 and heating system does not respond to commands.
Relay Output or Boiler Control Communication Failure
E04
Smart thermostat shows E04 and cannot detect the heating system type during setup.
Heating System Detection or Configuration Error
E05
Smart thermostat or Smart Radiator Thermostat shows E05 and does not control the valve or boiler.
Firmware or Internal Software Error
E06
Smart thermostat shows E06 and room temperature reading is clearly wrong (e.g., 5°C or 50°C indoors).
Internal Temperature Sensor Failure
E07
Smart thermostat shows E07 and cannot detect or control the hot water circuit.
Hot Water Relay or Sensor Configuration Error
E08
Smart Radiator Thermostat shows E08 and does not move the valve pin when heating is requested.
Motor or Gear Drive Failure in Smart Radiator Thermostat
E09
Smart Radiator Thermostat shows E09 and cannot complete calibration; valve either always open or always closed.
Valve Calibration Error
E10
Smart thermostat shows E10 and cannot detect external temperature or weather data; app shows missing weather integration.
Cloud Service or Weather Data Synchronization Error
E11
Smart thermostat shows E11 and cannot pair with the Internet Bridge during installation.
Pairing or Authentication Failure
E12
Smart thermostat shows E12 and cannot control the cooling (AC) unit via infrared.
IR Communication Failure with Air Conditioner
E13
Smart thermostat shows E13 and reports low battery even after new batteries are installed.
Battery Voltage Detection Error
E14
Smart thermostat shows E14 and cannot detect the external temperature sensor (if used with underfloor heating or special setups).
External Temperature Sensor Communication Failure
E15
Smart thermostat shows E15 and the boiler runs continuously or not at all, ignoring setpoints.
Control Logic or Zone Assignment Error
E16
Smart thermostat shows E16 and the boiler fails to fire when heat is requested.
Boiler Firing or Safety Lockout Detected by Tado
E17
Smart thermostat shows E17 and the display is dim, flickering, or resets randomly.
Power Supply or Voltage Instability
E18
Smart thermostat shows E18 and cannot update firmware.
Firmware Update Failure
E19
Smart thermostat shows E19 and cannot control the heating schedule; app schedules are ignored.
Schedule Synchronization Error
E20
Smart thermostat shows E20 and geofencing or location-based control does not work.
Location Services or Geofencing Error
Symptom
Boiler runs even when all Tado rooms are set to OFF or frost protection.
Unwanted Boiler Firing
Symptom
Condensation or mold appears on walls despite Tado controlling heating.
Humidity and Ventilation Imbalance
Symptom
Room is too cold even though Tado Smart Thermostat is calling for heat; boiler runs but radiators stay lukewarm.
Underheating Due to Incorrect Flow Temperature or Balancing
Symptom
Room overheats well above the set temperature; Tado shows heating off but radiators remain hot.
Radiator Valve Fails to Close or Boiler Overrun
Symptom
Smart Radiator Thermostat makes loud clicking or grinding noises during operation.
Mechanical Drive Noise or Gear Wear
Symptom
Tado app shows incorrect room names or devices appear in the wrong rooms.
Room Assignment or Mapping Error
Symptom
Tado Smart AC Control loses Wi-Fi connection frequently.
Wi-Fi Connectivity Instability
Symptom
Tado Smart AC Control turns the AC on, but the actual room temperature does not match the setpoint.
Ineffective Cooling/Heating Control via IR
Symptom
Tado Smart Radiator Thermostat drains batteries very quickly (every few weeks).
Excessive Power Consumption in Radiator Head
Symptom
Tado Smart Radiator Thermostat shows temperature much higher or lower than the actual room temperature.
Inaccurate Temperature Measurement at Radiator
Symptom
Tado Smart Thermostat backplate or Extension Kit feels warm or has a faint burning smell.
Overheating of Relay or Terminal Block
Symptom
Tado Smart Thermostat buttons or touch areas do not respond or respond intermittently.
User Interface Button Failure
Symptom
Tado Smart Thermostat display is blank and unresponsive.
No Power to Smart Thermostat
Symptom
Tado Smart Thermostat does not turn on the boiler for hot water, but heating works fine.
Hot Water Control Failure (Mechanical/Configuration)
Symptom
Tado Smart Thermostat frequently disconnects from the Internet Bridge; app shows it going offline and online repeatedly.
Intermittent RF Communication
Symptom
Tado Smart Thermostat frequently reboots or restarts on its own.
Unstable Internal Power or Firmware Crash
Symptom
Tado Smart Thermostat shows large temperature swings; room alternates between too hot and too cold.
Poor Temperature Control or Overshoot
Symptom
Tado Smart Thermostat shows time or schedule shifts after power cuts.
Loss of Time Synchronization After Power Interruption
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Smart thermostat shows E01 and cannot connect to the Internet; app reports device offline.
|
Internet Bridge Network Connectivity Failure | View Details |
| E02 |
Smart thermostat or Smart Radiator Thermostat shows E02 and cannot connect to the Internet Bridge.
|
Radio Link Failure to Internet Bridge | View Details |
| E03 |
Smart thermostat displays E03 and heating system does not respond to commands.
|
Relay Output or Boiler Control Communication Failure | View Details |
| E04 |
Smart thermostat shows E04 and cannot detect the heating system type during setup.
|
Heating System Detection or Configuration Error | View Details |
| E05 |
Smart thermostat or Smart Radiator Thermostat shows E05 and does not control the valve or boiler.
|
Firmware or Internal Software Error | View Details |
| E06 |
Smart thermostat shows E06 and room temperature reading is clearly wrong (e.g., 5°C or 50°C indoors).
|
Internal Temperature Sensor Failure | View Details |
| E07 |
Smart thermostat shows E07 and cannot detect or control the hot water circuit.
|
Hot Water Relay or Sensor Configuration Error | View Details |
| E08 |
Smart Radiator Thermostat shows E08 and does not move the valve pin when heating is requested.
|
Motor or Gear Drive Failure in Smart Radiator Thermostat | View Details |
| E09 |
Smart Radiator Thermostat shows E09 and cannot complete calibration; valve either always open or always closed.
|
Valve Calibration Error | View Details |
| E10 |
Smart thermostat shows E10 and cannot detect external temperature or weather data; app shows missing weather integration.
|
Cloud Service or Weather Data Synchronization Error | View Details |
| E11 |
Smart thermostat shows E11 and cannot pair with the Internet Bridge during installation.
|
Pairing or Authentication Failure | View Details |
| E12 |
Smart thermostat shows E12 and cannot control the cooling (AC) unit via infrared.
|
IR Communication Failure with Air Conditioner | View Details |
| E13 |
Smart thermostat shows E13 and reports low battery even after new batteries are installed.
|
Battery Voltage Detection Error | View Details |
| E14 |
Smart thermostat shows E14 and cannot detect the external temperature sensor (if used with underfloor heating or special setups).
|
External Temperature Sensor Communication Failure | View Details |
| E15 |
Smart thermostat shows E15 and the boiler runs continuously or not at all, ignoring setpoints.
|
Control Logic or Zone Assignment Error | View Details |
| E16 |
Smart thermostat shows E16 and the boiler fails to fire when heat is requested.
|
Boiler Firing or Safety Lockout Detected by Tado | View Details |
| E17 |
Smart thermostat shows E17 and the display is dim, flickering, or resets randomly.
|
Power Supply or Voltage Instability | View Details |
| E18 |
Smart thermostat shows E18 and cannot update firmware.
|
Firmware Update Failure | View Details |
| E19 |
Smart thermostat shows E19 and cannot control the heating schedule; app schedules are ignored.
|
Schedule Synchronization Error | View Details |
| E20 |
Smart thermostat shows E20 and geofencing or location-based control does not work.
|
Location Services or Geofencing Error | View Details |
| – |
Boiler runs even when all Tado rooms are set to OFF or frost protection.
|
Unwanted Boiler Firing | View Details |
| – |
Condensation or mold appears on walls despite Tado controlling heating.
|
Humidity and Ventilation Imbalance | View Details |
| – |
Room is too cold even though Tado Smart Thermostat is calling for heat; boiler runs but radiators stay lukewarm.
|
Underheating Due to Incorrect Flow Temperature or Balancing | View Details |
| – |
Room overheats well above the set temperature; Tado shows heating off but radiators remain hot.
|
Radiator Valve Fails to Close or Boiler Overrun | View Details |
| – |
Smart Radiator Thermostat makes loud clicking or grinding noises during operation.
|
Mechanical Drive Noise or Gear Wear | View Details |
| – |
Tado app shows incorrect room names or devices appear in the wrong rooms.
|
Room Assignment or Mapping Error | View Details |
| – |
Tado Smart AC Control loses Wi-Fi connection frequently.
|
Wi-Fi Connectivity Instability | View Details |
| – |
Tado Smart AC Control turns the AC on, but the actual room temperature does not match the setpoint.
|
Ineffective Cooling/Heating Control via IR | View Details |
| – |
Tado Smart Radiator Thermostat drains batteries very quickly (every few weeks).
|
Excessive Power Consumption in Radiator Head | View Details |
| – |
Tado Smart Radiator Thermostat shows temperature much higher or lower than the actual room temperature.
|
Inaccurate Temperature Measurement at Radiator | View Details |
| – |
Tado Smart Thermostat backplate or Extension Kit feels warm or has a faint burning smell.
|
Overheating of Relay or Terminal Block | View Details |
| – |
Tado Smart Thermostat buttons or touch areas do not respond or respond intermittently.
|
User Interface Button Failure | View Details |
| – |
Tado Smart Thermostat display is blank and unresponsive.
|
No Power to Smart Thermostat | View Details |
| – |
Tado Smart Thermostat does not turn on the boiler for hot water, but heating works fine.
|
Hot Water Control Failure (Mechanical/Configuration) | View Details |
| – |
Tado Smart Thermostat frequently disconnects from the Internet Bridge; app shows it going offline and online repeatedly.
|
Intermittent RF Communication | View Details |
| – |
Tado Smart Thermostat frequently reboots or restarts on its own.
|
Unstable Internal Power or Firmware Crash | View Details |
| – |
Tado Smart Thermostat shows large temperature swings; room alternates between too hot and too cold.
|
Poor Temperature Control or Overshoot | View Details |
| – |
Tado Smart Thermostat shows time or schedule shifts after power cuts.
|
Loss of Time Synchronization After Power Interruption | View Details |
No matching codes found
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