1. Ground wire not properly connected;
2. Insulation damage of the heating tube (this may be due to the magnesium oxide powder or connector insulation issues);
3.Electric heating tube burned out and short-circuited with the cup body;
4. Improper cleaning, water touching the terminals of the stainless steel heating tube;
5. Circuit wire falling off and touching the cup body;
6. Excessive dirt on the heating tube socket or power plug;
7. Poor water quality, severe scale buildup;
Solutions
1. Connect the ground wire as required and check if it is correct;
2. Inspect and repair; if the problem persists, replace the tube;
3. The heating tube is damaged; replace it with one of the same specifications;
4. Clean properly and dry the stainless steel heating tube;
5. Check the loose wire and re-solder it securely;
6. Clean properly and dry the components;
