W220 S430 Heat on high after replacing overhead assembly

Folks. I have broken my HVAC. It worked fine until I replaced the overhead sensor/switch/light unit due to a broken sun roof switch. The symptom is now the fan is on high and full heat. I must admit I did this without disconnecting the battery, so I broke this. (Stupid me) I disconnected the battery and put the original unit back in with the same symptom. I am now looking for help on what I could have broken. Thank you for your help.

Folks. I have broken my HVAC. It worked fine until I replaced the overhead sensor/switch/light unit due to a broken sun roof switch. The symptom is now the fan is on high and full heat. I must admit I did this without disconnecting the battery, so I broke this. (Stupid me) I disconnected the battery and put the original unit back in with the same symptom. I am now looking for help on what I could have broken.
Thank you for your help.

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