Hello, my name is George..There is a light switch on the lamp holder close to the door... press the switch to see if it is operational.. If it is not, then come back to me and I'll get you the part number for a replacement.Please rate the assistance given by me & kindly be patient whilst awaiting any responses from me as I'm not constantly available.
Can you not see it because it is in its cabinet or just because you cant visibly see it ?
Look to see if the button is damaged
According to the user manual and the service manual the light switch operates having been pushed by the hard edge of the door, therefore if as you say, the switch is not being operated, then I can only assume that the spring inside the door switch is not allowing the door switch to protrude enough for the the door to operate it...Change the switchAccording to the manual, this is the one your appliance has; the part number is ***** and here is a link to a spares site that sells it