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“PowerOn” for the OpenSprinkler is like switching off/on, i.e. restarting due to loss of power.
Have you connected anything to the sensor inputs or to GND/5V?
Or maybe a short circuit on COM and a zone?
Can you measure the power supply voltage to see whether it is and remains constant (measure the voltage for 5 minutes)?
If everything is no, then please contact support: https://opensprinklershop.de/support and refer to it here. We may need to replace the power board (that has the voltage converter)