Problem with led

[luka1952]

Re: How do you connect a LED RGB strip

Hi I've connected my led like in the topic above. The white light is turning on when i turn on the printer. But I can't change its colours:
My settings in cofig.g:
; LED
M950 F3 C"exp.heater3" Q500 ; RGB Red
M106 P3 C"RGB Red" ; set RGB Red PWM
M950 F4 C"exp.heater4" Q500 ; RGB Green
M106 P4 C"RGB Green" ; set RGB Green PWM
M950 F5 C"exp.heater5" Q500 ; RGB Blue
M106 P5 C"RGB Blue" ; set RGB Blue PWM

When I disconnect one of the pins then the colour changes. It looks like there is always power given to LED even when shows 0 (off) in DWC.
The power for (24+)led is connected directly to power supply.
Why can't I change colours with sliders in DWC?