My receiver is frozen on one channel, the LED blinks when pressing a button of the remote control but nothing happens

Try the following procedure on the remote control:

1.    Remove batteries

2.    Press the buttons repeatedly to ensure no buttons are stuck down.

3.    Leave the remote control for a couple of minutes

4.    Insert the batteries again and retry

If that fails, try cycling the power as follows:

5.    Remove power feed to the receiver for 30 seconds

6.    Plug it back to the receiver

7.    Switch the receiver on

8.    Try again.