1. Disconnect the controller from the power supply. There are 2-3 total connections to disconnect. The round data cable, the 5-pin plastic wiring harness. In some of our earlier models, the 2-pin connector was included in the data cable, if your sauna has the white wire that comes out of the power supply, it is not necessary to disconnect it.
2. There is a hole that the data cable enters the roof through. There should be an angled screw that holds the cable in place. That screw will need to come out.
Once the frame is removed, there will be 4 screws that will need to be removed. Remove the screws and the controller should easily come out.