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Dirty Flame Sensor Problem

It really is typical this seasonal time of year to note that your furnace is switching on and off two or three times for very brief runs. Then subsequent to the three attempts, the furnace shuts down for about an hour or two. After this wait period, the furnace attempts to start-up again. So why is my furnace not staying on? Maybe or maybe not your flame sensor may perhaps be the problem. Do I have an unsatisfactory flame sensor? Maybe you have a dirty flame sensor. This is very common for furnaces which may have not had a optimization or regular maintenance in the previous Two to five years.

What exactly ought I do regarding a dirty flame sensor?

Get a service technician clean and check your flame sensor. It might require replacing or only a cleaning, depending upon the problem. Typically either one of these solutions will likely be a relatively cost effective repair. Cleaning and checking the flame sensor should really be a regular element of a yearly maintenance tune up. Call Alexander Heating and Air for a tune up or acquire an annual service contract and feel confident of how your furnace is in great shape.

Warning: most furnace repairs involve high voltage and flammable gas. It is strongly advised you don’t perform this yourself. Have a skilled HVAC technician check and clean your flame sensor.

Just what is a flame Sensor and are they all necessary in my furnace?

The flame sensor is one among the many safety features inside of a gas furnace. There are some being checked right before the gas is allowed to burn and some right after the gas is burning. Those that are checked right after the gas is burning are available to safeguard you and your home from dangerous conditions while your gas is burning. The flame sensor is just one of those safety measures. The flame sensor is constructed out of metals that will create an electrical current if in the presence of a flame. It is usually meant to shut the product down when not enough burning fuel is detected from the last burner in the gang of burners inside the furnace. A constant flame from the last burner would indicate a reliable burning environment and also that the whole set of burners are getting approximately the very same amount of fuel and air. If no flame is there, then any one of the burners inside the group could possibly be burning fuel in an unsafe way. Therefore the system checks for the flame and closes the fuel valve when no flame is detected. Any system can have a false reading, so the control board usually tries to light the burners two more times. If these three times the system delivers the same message that the flame sensor isn’t detecting a flame, the whole furnace is shut down via the control board either for a couple of hours or completely until reset by a service technician. This is called a lockout condition.

What triggers flame sensors to malfunction?

You can find two possible challenges with flame sensors. A dirty flame sensor could be the most likely problem. At this point it is essential to understand that burning fuels do produce trace amounts of water when burning. And whenever water contacts most metals, the metals usually rust. This is also true with flame sensors. The metal end of a flame sensor can rust after a while. The rust accumulates and prevents the flame sensor from producing the current that tells the control board which it detects the flame. The other possible concern is that the flame sensor is now bad. This is usually a cracked insulator or perhaps short in the electrical components. Replacement is suggested for a bad flame sensor.

If you think you may have a problem with your furnace,

call The HVAC Guy at Alexander Heating and Air Conditioning.

For Quick,  Honest and Affordable  heating system services.

1-919-886-HVAC (4822)

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4 thoughts on “Dirty Flame Sensor Problem

  1. Mary Justen

    My flame sensor has been cleaned 4 times & I want the problem resolved.
    My repairman is saying that it might need a new circuit board (about $500).
    Is this likely or would just replacing the sensor fix the problem?
    Any help will be appreciated.

    Reply
    1. thehvacguy Post author

      Has he checked the micro amps DC on the flame sensor? If it is pulling 4-5 mA then the flame sensor is not the problem. It could be something else. The circuit board is expensive. But I would need to know more, like what is the error code the board is detecting?

      Reply
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