We tried to investigate but found it contains a sealed unit so unable to try much .
We removed the spiral wand that supports the metallic flame shapes and oiled it .
But we found by putting finger pressure on the rubber grommet attached to the motor this stops the knocking noise .
What could be causing this noise , it's so annoying !
Is anyone else suffering ?

Christine x, January 2015

Is it a rapid knocking maybe 2 or 3 taps a second,if so the rotisserie motor requires replacing they cost about £50

toptrish, January 2015