Final answer:
A combustion malfunction is a malfunction of an oil-fired heating system with attached ducting. This can occur due to problems with the combustion process, leading to the release of harmful carbon monoxide gas. It is important to ensure proper ventilation and adjustment of oil-fired heating systems to prevent carbon monoxide poisoning.
Step-by-step explanation:
A combustion malfunction is a malfunction of an oil-fired heating system with attached ducting. This occurs when there is a problem with the combustion process, leading to incomplete burning of fuel and the release of harmful carbon monoxide gas. When an oil-fired heating system is not properly ventilated or adjusted, it can result in carbon monoxide poisoning, leading to severe health risks and even death.