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How often do flame sensors go bad?įlame sensor lifespan If you’ve just replaced the sensor or had a new furnace installed, you can expect the flame sensor to last for about five years. It is a sensitive sensor so any type of dust or carbon buildup could cause it to malfunction. However a more common reason is that it is just dirty. What causes a flame sensor to go bad?Īs with any piece of equipment a simple reason could be that dirty flame sensor just goes bad. The flame sensor is an important safety feature on your furnace. Can you bypass flame sensor?Īttempting to bypass the flame sensor is not a good idea, even if it were possible. They are available at Home Depot, Menards or other building supply store. Universal flame sensors: You might not need an exact replacement part. The average cost to repair or replace a flame sensor is between $75–$200. If the sensor is bad, it won’t be able to sense heat and will turn the furnace off. How much does it cost to replace a flame sensor?įlame Sensor It stops your furnace from letting off large amounts of natural gas if it’s not working properly. When the flame lights, you should read between 0.5 and 10 microamps (μA), depending on the furnace.

Inspect the sensor: if the insulation is intact but appears sooty, burnt or slightly corroded, it might only require cleaning.

How do I know if my furnace flame sensor is bad? It detects and confirms whether or not there is a flame burning inside of the furnace. Where is the flame sensor on an electric furnace?Ī furnace flame sensor is a specialized safety component that is located inside of the burner assembly of a furnace. Remove the screw that holds the flame sensor rod in place. Look for a thin metal rod on the left side of the burner assembly this is the flame sensor.

22 When inspecting a gas furnace you notice the front of the furnace housing is scorched and scorched wires the problem could be what?.

21 Which of these conditions will cause the flame to lift off the burner surface?.

20 What is the most common manifold pressure for propane furnaces?.

19 Can you light your furnace with a lighter?.

18 How do you bypass the flame sensor on a furnace?.

16 How much does it cost to clean a flame sensor?.

15 Is the flame sensor and igniter the same thing?.

14 What does flame sensor do on furnace?.

13 When should I replace my flame sensor?.

12 How do you test a flame sensor signal?.

11 Why is my pilot light not staying lit on my furnace?.

10 Do all furnaces have a flame sensor?.

8 What causes a flame sensor to go bad?.

5 How much does it cost to replace a flame sensor?.

3 How do I know if my furnace flame sensor is bad?.

2 Where is the flame sensor on an electric furnace?.