We had a problem with our remote the red light that comes on when you press a button was onone morning and wouldn't go out, we removed the batterys then put them back in pressed, a button and the red light came on and stayed on.
called CS they sent a replacement, a letter with it said return the faulty remote, and if no fault was found, or wear and tear, dead batteries or remote was not returned they would charge £15 quid.
So my dad decided not to bother as he thought that would charge him regardless.