What is a common indicator of a combustion appliance malfunction in a home?

A strong odor of gas or smoke is a critical indicator of a malfunction in a combustion appliance. This scent suggests that there might be a leak of gas or that combustion byproducts are not being efficiently vented from the appliance. Inhaling gas or smoke is dangerous and poses serious health risks, which is why this warning sign should be taken seriously. Recognizing this odor is essential for ensuring safety in a home, prompting immediate action to address the potential malfunction.

In contrast, increased heating bills could indicate inefficiencies in the combustion appliance, but they are not a direct sign of a malfunction. Bright blue flames typically indicate proper combustion and efficiency, suggesting that the appliance is functioning well. Meanwhile, consistent appliance performance does not signal any issues; in fact, it often signifies that the appliance is operating as intended.