General problem characteristics of air dry heating heating tube:

1. Leakage (the phenomenon is that the automatic circuit breaker or the leakage protection switch is tripped, and the electric heating tube cannot be heated), which accounts for more than 90% of the heater failure

2. There is no heating response when the power is on (whether the electrode part is off or the contact is poor or the connection box is broken)

3. Obvious cracks appear on the surface of the ceramic tube (cracks in the electric heating tube, tungsten alloy heating wire is interrupted by high current, etc.)