E08
Tado
Motor or Gear Drive Failure in Smart Radiator Thermostat
Smart Radiator Thermostat shows E08 and does not move the valve pin when heating is requested.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stuck or seized TRV valve pin, Worn or stripped plastic gears in Tado radiator head, Failed stepper motor, Incorrect adapter causing misalignment
How to Fix / Troubleshooting
Safety first: Radiator valves can be hot. Allow the radiator to cool before working. Do not open the Tado head casing.
- Remove Tado head: Unscrew or unclip the Smart Radiator Thermostat from the valve body according to the manual.
- Check valve pin movement: Gently press the metal pin in the radiator valve with your thumb. It should move in and spring back. If stuck, carefully work it in and out several times until it moves freely. Do not use excessive force or tools that could damage the valve.
- Verify adapter: Ensure the correct Tado adapter (e.g., M30x1.5, Danfoss RA, RAV, RAVL) is installed tightly and aligned. A loose or wrong adapter can cause motor stall.
- Reinstall and recalibrate: Refit the Tado head, insert fresh batteries, and start the calibration process from the app. Listen for the motor moving the pin.
- If E08 returns: The internal motor or gears are likely damaged. Replace the Smart Radiator Thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Tado Smart Radiator Thermostat Motor Assembly
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