sounds like you tripped one of the sensors and have a fault.
if you are completely sure there is no real issue requiring service you can clear them if you know the button combination. unfortunately, the button combinations are not made public in most cases.
this is a similar unit and i'm not sure if the same code will work. you may need to try out different two code combinations.
i know on my pioneer receiver the combinations are the power button + other keys. based on the similar unit article above they may also use input + button on some products.