The master Smartcom control panel code is 4121. Please see the SmartCom3 Control Panel Installation and User Manual (https://www.reznor.co.uk/wp-content/uploads/2023/12/2a.-704020-SC3ML-Installation-and-Operating-Manual-v3a-Ben-EN-0416-A4F-GBSCOM1200416-1.pdf) for more information.
What is the master Smartcom control panel code?
Information on Reznor's range of control panels