TX20 Torx screwdriver Flat head screwdriver Switch off AC (mains) or external DC power, depending on the powering. Make sure that there is no power available to the station. Disconnect cabling from the terminal block to which the heater is connected. To remove the enclosure heater from the mounting plate, unscrew the fastening screws (4 pcs) and lift the heater. 1 Torx socket head screw 4×8 WN5251 (4 pcs) Attach the new heater to the mounting plate with the fastening screws. Connect the cabling to the terminal block. Switch on power. More information Powering and transient protection spare parts and components