E17
Tado
Power Supply or Voltage Instability
Smart thermostat shows E17 and the display is dim, flickering, or resets randomly.
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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
Weak or failing batteries, Unstable 230 V supply to wired thermostat, Loose power terminals, Faulty internal voltage regulator
How to Fix / Troubleshooting
Safety warning: For wired thermostats, turn off power at the breaker before inspecting terminals.
- Battery models: Replace all batteries with fresh alkaline cells and ensure proper seating. Avoid mixing old and new batteries.
- Wired models: With power off, remove the thermostat from its base and check that the low-voltage power wires are firmly secured in the correct terminals.
- Check for shared circuits: Avoid powering the thermostat from a circuit with heavy loads that cause voltage dips (e.g., large motors) if possible.
- Restore power and observe: After tightening connections, restore power and monitor the display. If flickering continues, the internal regulator may be defective.
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Repair Difficulty
Medium
3/5
Required Part
Tado Smart Thermostat Power Supply Circuit
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