For pet doors delivered before October 2013, it may happen in certain rare cases that after Resetting the parameters to the delivery state (see operating instructions 9.9.1) or after the Resetting your settings (see operating instructions 9.9.2) the motion detectors inside and outside no longer work and therefore the petWALK pet door no longer reacts to movement.
You can easily correct this misbehavior by switching the pet door to the operating state Sleep (press the red button on the remote control; the operating mode symbol will then light up RED), and then interrupt the power supply (pull out the plug or switch off the fuse if using a flush-mounted power supply unit).
After a few moments, you can reconnect the pet door to the power supply and start using it. Both motion detectors will react as usual.