Start with the indicator light, then verify charging before resetting anything.
Dreame's official L10s Ultra power-failure procedure separates two cases: if the Power/Clean indicator lights, restart the robot; if it stays dark, verify base power, clean the charging contacts and manually dock the robot. A factory reset comes only after those checks and will erase saved maps.
Find where the power-on sequence is failing
Does the Power/Clean indicator light when you press the button?
Dreame uses this as the first split in its official power-on troubleshooting.
What to do when the L10s Ultra will not power on
Check the Power/Clean indicator
Press the button once. If the indicator lights, press and hold Power/Clean to attempt a normal restart.
Confirm base-station power
Make sure the charging base is connected to power and that both ends of the power cord are seated securely.
Clean the charging contacts
Wipe the metal contacts on both the robot and base with a clean dry cloth. Do not use a wet cloth on powered charging contacts.
Manually align the robot on the dock
Place the robot on the base so the charging contacts meet correctly, then observe whether charging begins automatically.
Try a 3-second power-on
After the robot has been correctly docked, press and hold the Power/Clean button for about three seconds.
Reset only if necessary
Open the upper cover and hold the reset button for about three seconds until the factory-reset prompt. Remember: this clears saved maps and other stored data.
When to stop DIY
If the base is powered, contacts are clean, the robot has had an opportunity to charge and the official reset still produces no response, do not open the battery pack or main electronics. Dreame recommends contacting after-sales support and providing the troubleshooting results plus a short malfunction video.
Use these guides if the symptom is more specific
Not Charging
Use this if the robot turns on normally but does not take a charge from the base station.
Keeps Stopping
Use this if the robot powers on and starts cleaning, then pauses or stops during the task.