What is the consequence of failing to maintain gas appliances?

Failing to maintain gas appliances can lead to a variety of serious safety hazards. Regular maintenance ensures that appliances operate efficiently and safely, which is crucial in preventing gas leaks. A lack of maintenance may also result in malfunctions, where the appliances do not function as intended, potentially leading to dangerous situations such as fires or carbon monoxide poisoning. Therefore, the correct answer highlights the critical consequences of neglecting proper maintenance, which encompasses both the health and safety risks for individuals using those appliances and the integrity of the appliances themselves.