What happens when flame sensor goes bad?
What happens when a flame sensor goes bad? Without a flame sensor, your furnace will keep emitting gas even when there’s nothing to ignite it, resulting in hazardous gas buildup. If your flame sensor is dirty or faulty, it will automatically shut down the heating unit if it doesn’t detect a flame.
How do I know if my furnace flame sensor is bad?
Signs of a bad flame sensor
- Furnace burners turn on but go out after a few seconds.
- Soot and other debris is covering the end of the sensor (cleaning the flame sensor may fix this issue rather than a flame sensor replacement)
- Tip of flame sensor is black.
- Porcelain/sensor casing is cracked.
How does a flame sensor fail?
Good flame sensor: A properly functioning flame sensor will shut down the gas valve when it does not sense a flame when the furnace should be firing. Bad flame sensor: When the furnace has fired and is burning hot, a bad flame sensor won’t sense the heat and will shut down the furnace.
How much should it cost to replace a flame sensor?
Flame Sensor It stops your furnace from letting off large amounts of natural gas if it’s not working properly. If the sensor is bad, it won’t be able to sense heat and will turn the furnace off. The average cost to repair or replace a flame sensor is between $75–$200.
How do you trick a flame sensor?
Luckily, making such a check is very easy:
- Take a multimeter with microamps (µA) measuring system.
- Keep the furnace system turned on.
- Connect it to the wire that is leading to the gas valve.
- Connect the other side of the multimeter to the sensor terminal.
- Take the lead away from the flame sensor.
How much does a flame sensor cost for a furnace?
Flame Sensor If the sensor is bad, it won’t be able to sense heat and will turn the furnace off. The average cost to repair or replace a flame sensor is between $75–$200.
How much does it cost to replace a flame sensor?
How much is a new flame sensor for a furnace?
You can expect to pay between $350 and $500 for a new flame sensor if you call a furnace repair company.
Is it possible to bypass a flame sensor?
Well, while disappointing to some readers, here is the answer: No, bypassing the flame sensor isn’t a solution. You won’t find steps to bypass the flame sensor anywhere. Attempting to bypass the flame sensor is not a good idea, even if it were possible. The flame sensor is an important safety feature on your furnace.
Why does my flame sensor keep going out?
As with any piece of equipment a simple reason could be that dirty flame sensor just goes bad. However a more common reason is that it is just dirty. It is a sensitive sensor so any type of dust or carbon buildup could cause it to malfunction.
How to replace a furnace flame sensor?
Turn off the power to your furnace
What are the symptoms of a bad flame sensor?
Cracked porcelain on the flame sensor.
What does a flame sensor do on a gas furnace?
The furnace flame sensor is a short length of thin metallic rod found inside the burner assembly. It detects and confirms the presence of a flame burning inside the furnace to keep the gas supply alive or cut off supply as necessary to prevent poisoning and potential gas fire.
How to fix the ignitor problem on a furnace?
Signs of a Furnace Problem. The first step to addressing a malfunctioning igniter is knowing you have a problem.