Signs That Your Furnace Ignitor Is Bad and How to Check It Efficiently

If your furnace isn’t heating properly or won’t start, it might be due to a bad ignitor. In this blog, you’ll learn the signs that your furnace ignitor is bad and how to check it efficiently. Recognizing these signs early can help you avoid more severe issues and save on repair costs.

Key Takeaways

• Common signs of a bad furnace ignitor include blowing cold air, frequent on-and-off cycling, and clicking noises without ignition.
• Regular maintenance, like cleaning and inspections, can help prolong the life of your furnace ignitor and prevent issues.
• Using a multimeter to check the ignitor’s resistance is an effective way to diagnose if it’s faulty and may need replacement.

Recognizing a Bad Furnace Ignitor

Recognizing the indicators of a faulty furnace ignitor is crucial for maintaining a comfortable living space. Since the ignitor plays a pivotal role in sparking the gas that produces heat, being aware of these signs can help you address small issues before they escalate into significant complications. Addressing these issues early ensures uninterrupted heating performance and avoids costly repairs.

Below are typical signs that suggest your furnace’s ignitor may be malfunctioning:

Furnace Blows Cold Air

When your furnace vents blow cold air rather than the expected warm flow, it’s often a sign of an ignitor issue. This occurs when the ignitor fails to generate the necessary spark to ignite the gas. A professional technician can promptly inspect and resolve this issue to restore your home’s warmth and prevent further complications.

Furnace Won't Start

A furnace that won’t start is another common sign of a faulty ignitor. Modern furnaces often use an electric ignitor, which can fail and prevent the furnace from starting. The absence of a glowing ignitor or clicking sounds indicates that the ignitor may be attempting to function but failing. Addressing this with a professional ensures a thorough diagnosis and reliable repair.

Furnace Turns On and Off Frequently

Frequent short cycling, where the furnace repeatedly turns on and off in short intervals, is often caused by an ignitor struggling to maintain a steady spark. This issue can disrupt the combustion process, leading to inefficient heating. This not only reduces heating efficiency but also accelerates wear and tear on the system. Professional service can resolve this issue and restore optimal furnace performance.

Clicking Sound Without Ignition

A persistent clicking noise without ignition suggests the ignitor lights are unable to light the gas properly. This issue could stem from wear or electrical faults. A trained HVAC technician can inspect the ignitor and address any underlying problems.

Circuit Breaker Trips Repeatedly

A defective ignitor can cause the circuit breaker to trip due to excessive power consumption. This indicates a critical issue a professional technician should address to prevent further electrical damage or risks to your furnace.

Causes of a Faulty Furnace Ignitor

Understanding the reasons behind a malfunctioning furnace ignitor can help you take preventive measures. Ignitor failure may result from wear over time, dirt accumulation, or electrical problems. Issues with the gas valve can also lead to ignitor problems, as it controls the flow of gas to the combustion chamber. Here are some common causes and how professionals address them:

Age and Wear

Furnace ignitors typically last between 3 to 7 years. Electric hot surface ignitors, commonly used in modern furnaces, can degrade over time due to thermal cycling. Over time, thermal cycling and constant use can lead to degradation. HVAC technicians can perform routine inspections to identify signs of wear early, ensuring timely replacement before the system malfunctions.

Dirt and Debris

Accumulated dirt and debris around the hot surface ignitor can interfere with its function. Professionals clean ignitors during routine maintenance to remove grime and ensure efficient operation.

Electrical Issues

Power surges and fluctuations can damage the ignitor, affecting the furnace’s ignition system. HVAC technicians install surge protectors and check the electrical components to prevent future issues and protect the furnace’s integrity.

How Professionals Diagnose Furnace Ignitor Issues

If you suspect a faulty furnace ignitor, professionals follow these key steps to diagnose the issue accurately and safely:

Visual Inspection

Technicians visually examine the ignitor for signs of damage, such as cracks or discoloration, that might impair its function. Identifying physical damage early prevents larger issues from developing.

Using Specialized Tools

HVAC professionals use advanced tools like multimeters to test the ignitor’s resistance. Unlike older systems that use a pilot light, modern furnaces rely on electric ignitors that can be tested with a multimeter. If the resistance is outside the acceptable range, they determine whether the ignitor needs repair or replacement. This precise testing ensures accurate diagnosis.

Inspecting the Flame Sensor

The flame sensor plays a key role in furnace operation by detecting the flame and signaling the ignitor. Professionals clean and inspect the flame sensor to ensure it functions correctly and prevents ignition issues.

Troubleshooting and Professional Solutions for Ignitor Issues

When furnace ignitor issues arise, professionals perform targeted troubleshooting steps to resolve the problem efficiently. Here’s how:

Resetting the Furnace

Technicians may reset the furnace to address minor issues like cold air or failure to start. Resetting the furnace can help restart the heating process and address minor ignition issues. They follow manufacturer guidelines to ensure the reset is done safely and effectively.

Cleaning the Ignitor

Dirt and debris can hinder ignition and reduce efficiency. During maintenance visits, HVAC experts use specialized cleaning tools to remove dirt without causing damage to the ignitor.

Replacement or Repair

If the ignitor is beyond repair, technicians perform a furnace repair by replacing it with a high-quality, compatible component. They ensure proper installation to restore your furnace’s reliability and safety.

Preventative Maintenance for Furnace Ignitors

Preventative maintenance is the key to extending the life of your furnace ignitor. Professionals recommend regular inspections, thorough cleaning, and annual tune-ups to ensure reliable performance.

Regular Inspections

Certified HVAC technicians conduct routine checks to identify potential issues with the ignitor or its connections. This proactive approach enhances furnace efficiency and prevents costly breakdowns.

Keeping the Area Clean

During maintenance visits, professionals ensure the furnace and surrounding area are free from debris that could compromise the ignitor’s performance. This reduces the risk of operational issues and prolongs the system’s lifespan.

Scheduling Professional Tune-Ups

Routine maintenance by HVAC professionals includes detailed inspections, cleaning, and adjustments to ensure your furnace operates at peak efficiency. This service not only extends the lifespan of the ignitor but also safeguards the entire heating system.

Summary

Recognizing the signs of a faulty furnace ignitor and addressing them promptly can help you avoid unexpected breakdowns and high repair costs. By staying vigilant and taking timely action, you ensure that your furnace operates efficiently and reliably throughout the cold months, keeping your home comfortable and safe.

At Moncrief Heating and Air Conditioning - An Ace Hardware Home Services Company, we specialize in comprehensive HVAC installation, repair, and maintenance. With over 125 years of experience in the greater Atlanta area, we provide expert heating repair for Atlanta furnaces, ensuring your home stays warm and cozy. Contact us today to learn how we can prepare your furnace for the winter ahead!