Tools :
- Metric Allen Key set
- 13mm socket ?(adjustable wrench)
Process :
Start with the room temperature and unplugged from the wall.
1. Follow this guide to remove the filter box.
2. Disconnect the wiring for the heater out TC at J503 located at the bottom of the control PCB. 
3. Follow the wire from the board to the thermocouple cutting any zip ties or moving any obstructions.
4. Using an adjustable wrench unscrew the compression nut holding the thermocouple in place. Once all the way unscrewed pull out the thermocouple. 
5. Move the compression nut and ferrule from the old thermocouple to the new thermocouple.
6. Reverse steps 4, 3, 2, and 1 to reassemble.