If an appliance regulator is defective, what is a possible consequence?

• A. The flame will always be smaller
• B. The gas will stop flowing completely
• C. The appliance may over-fire or under-fire
• D. There will be no effects

Answer: (C)

A regulator’s job is to deliver a steady gas pressure to the appliance so the flame stays at the intended size and heat. If the regulator is defective, pressure can go too high or too low. When pressure is too high, the burner can over-fire, producing a flame that’s larger and hotter than intended. When pressure is too low, the burner under-fires, resulting in a weak flame, poor combustion, and potential safety hazards like incomplete combustion or CO buildup. That’s why the best answer is that the appliance may over-fire or under-fire. The other options don’t fit because a faulty regulator doesn’t reliably cause only a smaller flame, nor does it typically stop gas flow entirely, and there will be effects on flame performance rather than none.