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Concord Furnace Troubleshooting

The Complete Guide to Concord Furnace Troubleshooting

Concord furnaces, known for their quality and efficiency, are a popular choice for home heating solutions. To ensure their longevity and optimal performance, regular maintenance and timely Concord furnace troubleshooting…

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An image taken by our technician right before Concord Troubleshooting. The furnace is clearly dusty, which may have caused a problem to its flame sensor

Concord furnaces, known for their quality and efficiency, are a popular choice for home heating solutions. To ensure their longevity and optimal performance, regular maintenance and timely Concord furnace troubleshooting are paramount. 

These practices can prevent minor issues from escalating into major, costly problems and enhance the furnace’s energy efficiency. Besides, knowing how to troubleshoot your Concord furnace can save you from discomfort during cold spells, helping identify common problems and execute basic fixes. 

However, remember that certain complications demand the expertise of professionals. So, always prioritize safety and consult an expert when necessary. 

This guide will serve as a valuable resource for homeowners and DIY enthusiasts alike, offering insights into Concord furnace troubleshooting. Let’s get started on this journey to understand your heating system better.

The Basics of Your Concord Furnace Troubleshooting

When it comes to Concord furnace troubleshooting, a fundamental understanding of the furnace’s operation and components is the first step. Let’s begin by getting familiar with the basics of your heating system.

A Concord furnace operates by using either gas or oil as fuel to heat air. This warm air is then distributed throughout your home via a system of ductwork, creating a cozy indoor environment. 

Key components of your furnace include the burner, where the fuel is combusted; the heat exchanger, where air is warmed; the blower, that circulates the warm air; and the flue, that expels combustion by-products.

Knowing these elements is essential, as they can become the source of common problems associated with furnaces. For example, issues may arise from a dirty or clogged air filter, a malfunctioning thermostat, or a faulty ignition. Each of these issues can affect your furnace’s performance, and timely Concord furnace troubleshooting can prevent these from becoming severe.

Common problems include the furnace not producing enough heat, the blower continuously running, or unusual noises coming from the furnace. 

Some of these issues might be due to a simple oversight, like a thermostat set to a wrong mode, while others may indicate a more serious problem like a failing motor.

Common Concord Furnace Issues and Their Symptoms

Our technician's manometer pressure reading 0.0 when he did Concord furnace troubleshooting in the field

In the process of Concord furnace troubleshooting, recognizing common issues and their corresponding symptoms is crucial. This section will guide you through several typical problems and what signs to look out for in each case.

  • Furnace Not Heating Properly: If your Concord furnace isn’t heating your home sufficiently, the cause could be various factors such as a dirty air filter obstructing airflow, a malfunctioning thermostat, or issues with the burner.
    Signs: Cold or unevenly heated rooms, furnace runs but with little to no heat.
  • Furnace Making Unusual Noises: While furnaces often make some noise during operation, unusual sounds like squeaking, rattling, or banging could indicate problems such as a loose belt, ignition issues, or a failing motor.
    Signs: Strange or excessively loud noises during furnace operation.
  • Furnace Continuously Running: A furnace that won’t stop running usually indicates a problem with the limit switch, which might need replacement. It could also be due to a wrong thermostat setting.
    Signs: The blower keeps running, leading to excessive energy usage and potentially uncomfortable indoor temperatures.
  • Furnace Fails to Ignite: This could be due to issues with the ignition sensor or pilot light in older models. For modern Concord furnaces with electronic ignition, it might be a faulty ignitor.
    Signs: The furnace attempts to start but fails, or it doesn’t start at all.
  • Frequent Cycling: If your furnace is frequently turning on and off, it could be due to an oversized furnace, a dirty filter, or a faulty thermostat.
    Signs: The furnace cycles on and off more often than usual.

Each of these common issues offers its own unique signs, but they all suggest a need for some Concord furnace troubleshooting. The next sections of this guide will help you understand how to diagnose and potentially resolve these problems. However, remember to always seek professional help when the issue is beyond a simple fix, to avoid any damage to the furnace or risks to your safety.

READ: The Ultimate Guide to Goodman Furnace Problems

Step-by-step Troubleshooting Guide

Conducting effective Concord furnace troubleshooting involves a systematic approach to diagnose and resolve common issues. In this section, we’ll walk through the detailed steps for addressing each common problem we discussed earlier.

Furnace Not Heating Properly

  • Check your thermostat to ensure it’s set to ‘heat’ mode and the desired temperature is higher than the room temperature.
  • Inspect the air filter. If it’s dirty or clogged, replace it to improve airflow.
  • If the above steps don’t work, a professional may need to inspect the burner and other components.

Furnace Making Unusual Noises

  • Identify the type of noise. Squealing might indicate a loose belt, while rattling could suggest loose panels or screws.
  • Secure any loose components, if possible. If the noise persists, a professional inspection may be required to check the motor or ignition system.

Furnace Continuously Running

  • First, check the thermostat setting. If it’s set to ‘continuous fan’, change it to ‘auto’.
  • If this doesn’t solve the problem, a faulty limit switch might be the cause. This usually requires a professional replacement.

Furnace Fails to Ignite

  • For older models with a pilot light, check if the light is on. If not, follow the owner’s manual to safely relight it.
  • Modern Concord furnaces with electronic ignition don’t have a pilot light. If the furnace fails to ignite, it may indicate a faulty ignitor, requiring professional assistance.

Frequent Cycling

  • Check the air filter and replace it if it’s dirty.
  • Ensure the thermostat is set correctly. If the issue persists, a professional might need to assess if the furnace is oversized for your home or if the thermostat is faulty.

READ: The Ultimate Guide to Carrier Furnace Light Codes

Using Furnace’s Error Codes for Diagnostics

Many modern Concord furnaces have a built-in diagnostic system that displays error codes when something goes wrong. These codes can be extremely helpful in Concord furnace troubleshooting.

Refer to your furnace’s owner’s manual or look up the specific model online to find a list of error codes and their meanings. By identifying the error code, you can gain a better understanding of the issue at hand and determine whether it’s something you can handle or if it requires professional help.

Remember, while this guide can help you with basic troubleshooting, always prioritize safety. If you’re uncertain or the issue is complex, it’s best to call in a professional to avoid any potential harm or further damage to your furnace.

How to Reset Your Concord Furnace

Resetting your Concord furnace can often resolve minor issues or clear error codes after a problem has been fixed. However, it’s crucial to know when and how to perform this process safely.

When to Reset Your Furnace

Resetting your furnace is typically appropriate after addressing a problem like a dirty filter, tripped circuit breaker, or after professional repair work. It’s also useful if your furnace isn’t responding as expected, as a reset might help the system regain its standard operation.

Steps to Safely Reset Your Concord Furnace

  • Power Off: Begin by switching off the furnace. You can do this by turning off the switch located on or near the furnace or by flipping the appropriate circuit breaker in your home’s electrical panel.
  • Wait: Allow the furnace to sit without power for a few minutes. This brief period gives the system time to clear any lingering error codes or data.
  • Power On: Restore power to the furnace by turning the switch back on or flipping the circuit breaker to its original position.
  • Reset the Furnace: Locate the reset button on your furnace. It’s typically red and found in the burner motor compartment. Press and hold this button for about 30 seconds.
  • Observe: Watch and listen to your furnace for a few minutes after the reset. The furnace should start up, and operation should return to normal.

Please note, resetting the furnace repeatedly can damage the system if the underlying issue is not resolved. If your Concord furnace is not functioning correctly after the reset, or if the same error recurs, it’s time to call a professional for an in-depth assessment and necessary repairs.

Being comfortable with Concord furnace troubleshooting, including understanding how and when to reset your furnace, can save you valuable time and potentially avoid unnecessary discomfort, especially during the colder seasons.

When Should You Replace Filters?

Our technician replacing filters after  Concord furnace troubleshooting

An essential aspect of Concord furnace troubleshooting and maintenance is understanding the importance of regular filter replacement. Furnace filters play a vital role in ensuring efficient operation and maintaining the air quality in your home. A clogged or dirty filter can lead to numerous furnace issues and negatively impact your health.

What’s the Importance of Regular Filter Change?

Regularly changing your furnace filter provides several benefits:

  • Improved Efficiency: Clean filters allow for smooth airflow, reducing the amount of work your furnace needs to do, thus improving energy efficiency.
  • Longer Furnace Lifespan: Regular filter changes reduce the risk of overheating and strain on the furnace, contributing to a longer lifespan for the unit.
  • Better Air Quality: Filters trap dust, allergens, and other particles, enhancing the air quality in your home.

How to Identify Signs of a Clogged Filter

Knowing when to replace your filter is crucial. Here are signs indicating that it’s time for a change:

  • Visual Inspection: A straightforward way to determine if a filter needs replacing is by visual inspection. If the filter appears dirty, dusty, or clogged, it’s time to replace it.
  • Decreased Airflow: If you notice a decrease in the amount of warm air coming from your vents, it could indicate a clogged filter.
  • Increased Heating Bills: If your energy bills are higher than usual without a significant increase in usage, a clogged filter forcing the furnace to work harder could be the culprit.
  • Frequent Cycling: If your furnace frequently turns on and off, the reduced airflow from a clogged filter could be causing the furnace to overheat and shut off prematurely.

As a rule of thumb, standard furnace filters should be checked at least every 30-90 days and replaced as necessary. However, the frequency may increase if you have pets, if anyone in your home has allergies, or during periods of heavy furnace usage.

By staying vigilant about filter changes, you’re taking a significant step in proactive Concord furnace troubleshooting, leading to a well-performing, efficient heating system.

READ: The Ultimate Guide to Fixing a Rheem Chamber Sensor Failure Safely

Thermostat Troubles

While exploring Concord furnace troubleshooting, it’s important to remember that the thermostat is a significant part of your heating system. It serves as the command center for your furnace, and any issues with the thermostat can directly impact furnace operation.

Common Thermostat Issues Affecting Furnace Operation

  • Incorrect Settings: Sometimes, the issue might be as simple as the thermostat being set to the wrong mode (cool instead of heat) or the temperature being set too low.
  • Dead Batteries: If your thermostat is battery-operated, dead batteries could prevent it from properly controlling your furnace.
  • Faulty Wiring: Any issues with the wiring between the thermostat and the furnace could disrupt communication between the two.
  • Dirt and Dust: Dirt and dust can accumulate inside the thermostat, leading to inaccurate temperature readings or other operational issues.
  • Outdated Thermostat: Older, mechanical thermostats might lose their calibration over time, leading to less accurate temperature control.

Basic Thermostat Troubleshooting Steps

  • Check the Settings: Ensure the thermostat is set to ‘heat’ and that the desired temperature is higher than the current room temperature.
  • Replace the Batteries: If your thermostat operates on batteries, try replacing them.
  • Clean the Interior: Carefully remove the thermostat cover and gently clean away any dust or dirt with a soft brush or compressed air.
  • Check for Loose or Broken Wires: If you’re comfortable doing so, you can remove the thermostat cover and check for any loose or broken wires. Remember to switch off the power to the thermostat before you do this.
  • Consider an Upgrade: If your thermostat is old, you might want to consider upgrading to a newer, digital model for more accurate temperature control.

Thermostat troubles can often mimic furnace problems, so it’s wise to check the thermostat as part of your Concord furnace troubleshooting process. However, always remember that if you’re unsure or uncomfortable with any of these steps, it’s best to call a professional to avoid any potential risk or damage.

Checking the Gas Supply and Ignition System

In the realm of Concord furnace troubleshooting, checking the gas supply and ignition system is vital, especially for gas furnaces. These two components play a significant role in the overall operation and functionality of your furnace.

Tips for Inspecting the Gas Supply and Ignition System

  • Gas Supply: Check to make sure the gas valve is in the open position and gas is being supplied to your furnace. The handle should be parallel to the gas pipe for most models. If you suspect a gas leak due to an unusual smell, evacuate your home immediately and contact your gas company.
  • Ignition System: Modern Concord furnaces typically use electronic ignition systems, which are more efficient and reliable than traditional pilot lights. If your furnace fails to ignite, visually inspect the ignitor for any signs of damage.

However, due to the sensitive and potentially dangerous nature of these components, any hands-on inspection or repair work should only be done by professionals.

So When Should You Call a Professional?

Some of the Concord furnace troubleshooting may be best performed by a pro. So, any of the following situations warrant a call to a professional:

  • Suspected Gas Leak: If you smell gas or suspect a leak, don’t attempt to fix this yourself. Leave your home immediately and contact your gas company or a certified professional.
  • Furnace Doesn’t Ignite: If the furnace attempts to start but doesn’t ignite, the problem could be with the ignition system, which should be inspected by a professional.
  • Changes in Flame Color: If you notice the flame has turned yellow or flickering, it could indicate a combustion problem which requires professional attention.

It’s essential to respect the complexity and potential danger involved when dealing with the gas supply and ignition system during Concord furnace troubleshooting. Always prioritize safety and don’t hesitate to reach out to a trained technician when required.

FAQs for Concord Furnace Troubleshooting

Here, we address some frequently asked questions about Concord furnace troubleshooting, offering insight into common concerns and curiosities homeowners often have about their heating system.

How often should I schedule professional maintenance for my Concord furnace?


A: It’s recommended to schedule professional maintenance at least once a year, ideally before the heating season begins. Regular professional check-ups can identify potential issues before they become significant problems.

Q: Why is my furnace blowing cold air?

A: If your furnace is blowing cold air, it could be due to a variety of reasons, such as a wrong thermostat setting, a clogged filter, or issues with the pilot light or ignition system.

Q: How do I know when it’s time to replace my furnace instead of repairing it?

A: If your furnace is over 15-20 years old, requires frequent repairs, isn’t heating your home adequately, or your energy bills have significantly increased, it might be time to consider replacement.

Q: Can I perform all furnace troubleshooting tasks myself?


A: While some minor troubleshooting tasks can be performed by homeowners, it’s crucial to call a professional for complex issues, especially those involving gas supply or electrical components.

Q: Why does my furnace keep turning on and off repeatedly?


A: This is known as short cycling and could be due to an oversized furnace, a dirty filter, or a malfunctioning thermostat.

Q: Can I use any filter for my Concord furnace?


A: It’s best to use the filter recommended by the manufacturer for your specific model. Using the wrong filter can affect airflow and furnace performance.

By answering these questions, we hope to make your Concord furnace troubleshooting process smoother and more informed. If you ever face a problem you can’t solve or aren’t comfortable handling, call a professional technician to help solve it.

I'm an HVAC enthusiast and a passionate writer dedicated to sharing valuable insights and practical tips about heating, cooling, ventilation, and air conditioning systems.

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Hi there, I'm Robert Brooks

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