Responded to a no-heat call in Brentwood today. The homeowner's gas furnace was not igniting. Upon inspection, I found that the flame sensor was malfunctioning. The flame sensor is a critical safety device in Brentwood that ensures the gas burner shuts off if the flame goes out, preventing a dangerous buildup of gas. In this case, the sensor was not detecting the flame properly, causing the furnace to shut down. I carefully cleaned the flame sensor to remove any soot or debris that might be interfering with its operation. After cleaning, I tested the sensor and confirmed it was functioning correctly. The furnace is now operating safely and reliably, providing heat to the home. Remember, a malfunctioning flame sensor can be a serious safety concern, so regular furnace maintenance is crucial.