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Causes: Ceramic contact rod stuck by foreign objects; Thermal bimetal deformation; Fatigued or inelastic moving/static contacts; Welded contacts that can't open/close; Loose contact plate screws.

Solution: Remove foreign objects, ensure smooth movement; Adjust deformation, restore shape and elasticity; Adjust contact angles to restore elasticity; Polish contacts, replace if ineffective; Tighten screws securely.

Causes: Fuse diameter too small or capacity insufficient; Short circuit in power plug or socket; Loose heating tube tabs or leads causing short circuit; Burnt heating tube (resistance wire) or short circuit; Accumulated dirt or carbonization in heating socket causing short circuit.

Solution: Replace with appropriate fuse; Repair or replace power plug or socket; Reconnect securely; Repair or replace heating element; Clean dirt, repair or replace parts.

Causes: Abnormal power supply or power outage; Fuse blown; Poor contact between power plug and socket or broken power cord; Loose heating tube tabs or leads causing short circuit; Burnt heating tube; Poor contact or melted thermostat contacts.

Solution: Use after power supply normalizes; Replace with same model fuse; Repair or replace; Re-weld securely; Replace with same specification heating tube; Repair or replace thermostat.