Step 1 Check the heater fuse.
PS: We provide you spare fuse at the spare parts box. Please find it to replace.
Step 2 Check the Electric Relay
PS: If this step is OK, please follow step 3
Step 3 Change temperature controller
1. Temperature controller
2. Fix the temperature controller with screws
3. Plug the wire onto the main switch
PS: We provide you spare controller in your spare parts box, you can find and replace it.