The code is correct. With the code you can enter the cabin. First press the C and then the code 2748. Then listen to this fragment

https://www.bloomingescaperoom.com/wp-content/uploads/2021/08/fragment-5-eng.wav

Do you have light in the cabin? Then continue. Please close the door of the cabin when your inside and when you leave.

Continue
View hints
Hint 1

Swing the wheel on the right side of the house. Swing until the light turns green and the light turn on.