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How to Test a Flame Sensor?

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How to Test a Flame Sensor

How to Test a Flame Sensor – Good day Allellpro – When you’re having bother together with your furnace or boiler, it might be because of a defective flame sensor. The flame sensor is a vital part that detects the presence of a flame and sends a sign to the management board to maintain the furnace or boiler operating. On this article, we’ll focus on how you can check a flame sensor to find out if it is faulty.

What’s a Flame Sensor?

A flame sensor is a security system that detects the presence of a flame in a furnace or boiler. It is usually a metallic rod with a ceramic insulator that’s positioned close to the burner. When the burner ignites, the flame sensor detects the flame and sends a sign to the management board to maintain the furnace or boiler operating.

If the flame sensor does not detect a flame, it shuts down the furnace or boiler to forestall a possible security hazard.

Easy methods to Take a look at a Flame Sensor

Testing a flame sensor is a comparatively easy course of that requires a number of instruments:

  • Multimeter
  • Sandpaper or emery fabric
  • Screwdriver

Here is how you can check a flame sensor:

  1. Flip off the facility to the furnace or boiler.
  2. Take away the flame sensor from the burner meeting.
  3. Clear the metallic rod with sandpaper or emery fabric to take away any dust or particles.
  4. Reinstall the flame sensor again into the burner meeting.
  5. Activate the facility to the furnace or boiler.
  6. Set your multimeter to measure DC voltage and contact the probes to the flame sensor’s wire connectors.
  7. Begin the furnace or boiler and let it run for a couple of minutes.
  8. Test the multimeter studying. It needs to be between 1.5 and 4 DC volts. If the studying is exterior this vary, the flame sensor is defective and must be changed.
  9. If the flame sensor is working appropriately, flip off the furnace or boiler and reinstall any parts that had been eliminated.


Listed here are some often requested questions on flame sensors:

How usually ought to I check my flame sensor?

When you personal an HVAC system or furnace, it’s essential to pay attention to the significance of a flame sensor. This small system is liable for making certain that your furnace operates safely and effectively. It detects the presence of a flame and sends alerts to the management board to maintain your furnace operating easily. Nonetheless, like another a part of your HVAC system, the flame sensor can put on out over time and might have common testing.
So how usually do you have to check your flame sensor? The reply will depend on a number of components corresponding to utilization, age of the unit, and producer’s suggestion. Usually talking, it’s endorsed to check your flame sensor no less than as soon as each six months to make sure most security and effectivity. A correctly functioning flame sensor will stop gasoline leaks or fireplace hazards attributable to defective ignition techniques.

Can I clear my flame sensor with water?

Because the temperature drops, it’s vital to make sure that your HVAC system is working effectively. One of many very important parts of your furnace is the flame sensor. It senses when the gasoline valve opens and ignites the burner, making certain that it stays lit. When you’re experiencing points together with your furnace not beginning up or staying on for lengthy durations, then it may very well be because of a grimy flame sensor.
When testing your furnace, when you discover that your flame sensor wants cleansing, you might be questioning if water is a secure possibility. The reply isn’t any. Utilizing water to wash any a part of an HVAC system could cause harm and pose security dangers. Water left on a flame sensor can corrode and harm its floor, rendering it ineffective and even harmful.

What ought to I do if my flame sensor is defective?

A defective flame sensor is usually a security hazard on the subject of working your HVAC system, significantly the furnace. The flame sensor is liable for detecting whether or not the ignition has taken place and if there’s a hearth in your furnace. When it’s defective, the sensor might not detect whether or not there’s any fireplace, which might trigger harm to your property and even an explosion in extreme instances. Due to this fact, it is essential to check and substitute a defective flame sensor as quickly as doable.

A technique of testing whether or not your flame sensor is working appropriately is by visually inspecting it. Swap off the facility provide to the furnace and take away the quilt that homes the flame sensor. Test for any cracks or indicators of damage on its floor. If there are any seen damages, then it’s essential substitute them instantly with a brand new one.

By following these easy steps, you may decide in case your flame sensor is working appropriately and keep away from potential issues down the street. See you once more in one other attention-grabbing article.
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