Is Your Furnace Ignitor Failing? Here’s Why It Should Have Continuity!
What To Know
- A furnace ignitor is a small, ceramic component that plays a vital role in the ignition process of your furnace.
- If the ignitor has continuity, the multimeter will show a low resistance reading, typically in the range of a few ohms.
- If a furnace ignitor doesn’t have continuity, it means that the element is broken and cannot generate the spark needed to ignite the fuel.
The furnace is the heart of your home’s heating system, keeping you warm and cozy during the cold winter months. But what happens when it malfunctions? One common issue that can arise is a faulty ignitor. Understanding whether a furnace ignitor should have continuity is crucial for diagnosing and fixing the problem. In this post, we’ll delve into the world of furnace ignitors, exploring their role, functionality, and how to determine if they’re working correctly.
What is a Furnace Ignitor?
A furnace ignitor is a small, ceramic component that plays a vital role in the ignition process of your furnace. It’s essentially a spark plug, responsible for generating a spark that ignites the gas or oil in the combustion chamber.
How Does a Furnace Ignitor Work?
The ignitor operates on the principle of electrical resistance. When the furnace thermostat calls for heat, the ignitor receives a current. This current heats the ignitor element to a high temperature, causing it to glow red-hot. The intense heat from the glowing element then ignites the fuel, starting the combustion process.
The Importance of Continuity
The term “continuity” in this context refers to the uninterrupted flow of electricity through a circuit. A furnace ignitor should have continuity when it’s working properly. This means that electricity can pass through the ignitor element without any interruption.
Testing for Continuity
Testing for continuity is a simple process that can be done with a multimeter. Here’s how:
1. Turn off the power to the furnace. This is crucial for safety and to avoid electrical shock.
2. Locate the ignitor. It’s typically found near the burner assembly.
3. Set the multimeter to the ohms setting. This setting allows you to measure resistance.
4. Touch the probes of the multimeter to the terminals of the ignitor. One probe should be placed on each terminal.
5. Observe the reading on the multimeter. If the ignitor has continuity, the multimeter will show a low resistance reading, typically in the range of a few ohms. If the reading is infinite or very high, it indicates a broken ignitor.
What Happens When a Furnace Ignitor Doesn’t Have Continuity?
If a furnace ignitor doesn‘t have continuity, it means that the element is broken and cannot generate the spark needed to ignite the fuel. This will result in the furnace failing to start, leaving you shivering in the cold.
Common Causes of Ignitor Failure
Several factors can contribute to ignitor failure, including:
- Age: Ignitors are designed to last for a certain period, and over time, the element can wear out or become brittle.
- Overheating: If the ignitor is exposed to excessive heat, it can damage the element.
- Corrosion: Corrosion can build up on the ignitor element, preventing proper electrical contact.
- Electrical problems: Faulty wiring or a malfunctioning control board can also lead to ignitor failure.
Replacing a Faulty Ignitor
If you’ve determined that your ignitor is faulty, replacing it is a relatively straightforward process. However, it’s important to remember that working with electrical components can be dangerous. If you’re not comfortable with electrical work, it’s best to call a qualified HVAC technician.
Here are the general steps involved in replacing a furnace ignitor:
1. Turn off the power to the furnace.
2. Remove the old ignitor. This usually involves disconnecting the wiring and removing the ignitor from its mounting bracket.
3. Install the new ignitor. Make sure to connect the wiring correctly and secure the ignitor in its mounting bracket.
4. Turn the power back on to the furnace.
Final Thoughts: Ensuring Your Furnace’s Longevity
A properly functioning furnace ignitor is essential for a reliable and efficient heating system. By understanding the importance of continuity and knowing how to test for it, you can quickly diagnose and resolve any issues with your ignitor. Remember, regular maintenance and professional inspections can help prevent ignitor failures and ensure your furnace operates smoothly for years to come.
What You Need to Learn
Q: How often should I replace my furnace ignitor?
A: While ignitors are designed to last for several years, they are not immune to wear and tear. It’s generally recommended to replace your ignitor every 5-7 years, or sooner if you notice signs of malfunction.
Q: Can I use a universal ignitor for my furnace?
A: While some universal ignitors are available, it’s important to ensure they are compatible with your specific furnace model. Consult your furnace manual or a qualified HVAC technician to confirm the correct ignitor for your system.
Q: What are some signs that my furnace ignitor might be failing?
A: Some common signs of a failing ignitor include:
- Furnace not igniting: The most obvious sign is when the furnace doesn’t start.
- Clicking noises: You might hear clicking sounds coming from the furnace as the ignitor tries to spark.
- Burning smell: A burning smell could indicate that the ignitor is overheating or malfunctioning.
- Reduced heating output: If the furnace is struggling to heat your home, a faulty ignitor could be the culprit.
Q: Can I clean my furnace ignitor to extend its lifespan?
A: It’s not recommended to clean a furnace ignitor yourself. Cleaning it can damage the element and compromise its functionality. If you suspect dirt or debris is affecting the ignitor, consult a professional HVAC technician for cleaning and inspection.