Hans Grohe 31101XX1 Block the sensor for 2 seconds, Wait 10 seconds 1, then replace the set screw

Reset the faucet: Remove the set screw with a 2.5 mm Allen wrench.

Block the sensor for 2 seconds.

Wait 10 seconds (1), then replace the set screw (2).

Wait 15 seconds (3). Place a hand in front of the sensor

(4). The water should turn on.