What a Flame Sensor Is and Why It Matters

Setting up your annual furnace maintenance helps keep your heating system working up to thirty percent more efficient and helps extend the life of your system. But things may still stop working, and when they do, you may feel like it’s always something else. 

This time it’s your motor, next time it’s your pressure switch. Now you have to have your flame sensor replaced. 

By the way – what is a flame sensor? 

A flame sensor is a critical safety component on your gas heating equipment. During the ignition sequence, your gas furnace goes through a process where a spark or a hot surface ignitor actually ignites the gas. When the gas is ignited, the flame sensor produces a current of electricity. This is measured in micro amps. If the furnace’s control board doesn’t read the right level of micro amps, the furnace will no longer give the system fuel to stop an explosion. 

Over time, if the flame sensor is not adequately cleaned, oxidation or carbon buildup can impede the flame sensor’s ability to operate properly, which can cause the furnace to malfunction. 

The way to establish if a soiled flame sensor is the reason for a furnace malfunction is to take a micro amp draw reading, which an expert furnace technician can supply you. If a dirty flame sensor is the offender, the heating expert will clean the sensor with steel wool. If dirt was the sole factor, we will see a notably higher amp reading. If the reading does not change, the technician will proceed with the heating system repair diagnostic process. 

If you aren’t confident your heating equipment is going to survivie these last few weeks of winter, give Service Experts Heating, Air Conditioning & Plumbing a call and we’ll come out and provide you with a full furnace maintenance or a free in-home estimate on a new HVAC system. 

  • How to Choose a Good HVAC System

    When it comes to keeping your home comfortable during every season, nothing is more critical than picking out the right heating, ventilation and air conditioning (HVAC) system. This choice influences your daily comfort, monthly utility bills and all-around home efficiency. But, with so many system... Continue reading

  • Year-End HVAC Maintenance List

    Once the air starts to get cold, you know it’s time to prepare your home for the cooler months ahead. Your heating system is critical to maintaining a cozy, warm environment. A well-maintained furnace delivers the comfort you crave while using a smaller amount of energy. Routine inspections also... Continue reading

  • 2024 Furnace and Air Conditioning Trends

    In the ever-evolving world of home HVAC, keeping up with the newest HVAC trends is imperative for homeowners looking to enhance their home’s comfort and efficiency. Going into 2024, the HVAC industry continues to innovate, bringing brand-new technologies and trends aimed at changing how... Continue reading