1. Observe the appearance of the stove: If the appearance of the carbon-roasted duck stove is obviously damaged, deformed or rusted, it may mean that the stove has been damaged.

2. Check the function of the stove: If the charcoal-roasted duck stove does not work properly, such as unable to heat, fail to burn, or the flame is unstable, it may indicate that the stove has been damaged.

3. Check the energy consumption of the stove: If the energy consumption of the carbon-roasted duck stove is significantly higher than that of similar products, it may mean that the stove is damaged or faulty.

4. Check the safety of the stove: If there are safety hazards in the carbon-roasted duck stove, such as air leakage, electricity leakage, etc., it may mean that the stove has been damaged.