How to Identify the Signs of a Malfunctioning Furnace & What to Do About Furnace Repair

It's a cold winter night and the last thing you want to experience is a malfunctioning furnace. But, it happens. How do you identify the signs of a malfunctioning furnace and what should you do about furnace repair? Read this article to find out.

When you're dealing with a furnace, there are many potential causes of a malfunction. From clogged air filters and corrosion to a faulty thermostat or a broken blower motor, identifying the source of the problem is the first step towards successful furnace repair.

In this article, we'll discuss the warning signs of a malfunctioning furnace, what you can do to troubleshoot the issue, and the best way to go about furnace repair. So, if you're experiencing a furnace issue, read on to find out what you need to do.

Common Signs of a Malfunctioning Furnace

A malfunctioning furnace can be a huge inconvenience, especially during cold weather. Knowing the common signs of a malfunctioning furnace can help you identify the problem and take action as soon as possible. Here are some common signs of a malfunctioning furnace:

1. Unusual Noises: If you hear strange noises coming from your furnace, it could be a sign of a problem. Common noises include rattling, buzzing, or banging. It’s best to have a professional inspect your furnace if you hear any strange noises.

2. Yellow Pilot Light: A yellow pilot light instead of a blue one is an indication of a problem with your furnace. This could be due to a carbon monoxide leak, which is a serious issue and requires immediate professional attention.

3. Unusual Odors: If you smell something strange coming from your furnace, it could be a sign of a malfunction. Different odors can indicate different problems, so it’s best to have a professional inspect your furnace to determine the cause of the odor.

4. Poor Airflow: If you notice that your furnace is not producing the same amount of warm air as it used to, it could be a sign of a problem. Poor airflow could be due to clogged air filters or a malfunctioning blower motor.

5. Frequent Cycling: If your furnace is cycling on and off more frequently than usual, it could be a sign of a problem. This could be due to a malfunctioning thermostat, a blocked air filter, or a faulty limit switch.

Identifying the signs of a malfunctioning furnace can help you take action as soon as possible. If you suspect your furnace is malfunctioning, it’s best to have a professional inspect and repair your furnace.

Steps to Troubleshoot the Issue

If you suspect that your furnace is malfunctioning, then you need to take some steps to troubleshoot the issue. Here are the steps you should take:

Step 1: Check the Thermostat – Start by checking your thermostat to make sure it is working properly. If it is not, then you will need to replace it.

Step 2: Check the Air Filter – The air filter should be changed every one to three months. If it is clogged or dirty, then it could be blocking air flow and causing the furnace to malfunction.

Step 3: Check the Pilot Light – If your furnace has a pilot light, then you should check to make sure it is lit. If it is not, then you may need to relight it.

Step 4: Inspect the Blower Motor – The blower motor is responsible for circulating air through the furnace. If it is not working properly, then you may need to replace it.

Step 5: Hire a Professional – If you are still unable to identify the problem, then it may be best to hire a professional to inspect and repair your furnace.

Determining the Source of the Problem

When your furnace is malfunctioning, it’s important to identify the source of the problem. This will help you know what kind of repairs you need to do, and whether you can do the repairs yourself or if you should call a professional. Common sources of furnace problems include:

1. Pilot Light - If the pilot light is out, you may need to relight it. If the pilot light won’t stay lit, you may need to replace the thermocouple.

2. Gas Valves - If the gas valves are clogged or not working properly, they may need to be replaced.

3. Thermostat - If the thermostat is not working properly, you may need to replace it.

4. Blower Motor - The blower motor may need to be cleaned or replaced if it is not working properly.

5. Ductwork - If the ductwork is leaking or not sealed properly, you may need to have it inspected and repaired.

6. Ignition System - If the ignition system is faulty, you may need to have it replaced.

Identifying the source of the problem is the first step in determining what repairs need to be done. If you are unsure of what needs to be done, it’s best to call a professional HVAC technician to inspect and repair your furnace.

DIY Troubleshooting Tips for Furnace Repair

If you’re comfortable with doing it yourself, furnace repair can often be completed with a few simple steps. To begin troubleshooting, start by turning off the power to the furnace and checking the thermostat. Make sure that the thermostat is set to the correct temperature and that the unit is turned on. If the thermostat is functioning properly, check to make sure that the furnace motor is running. If the motor isn’t running, it may be a sign that the motor has burned out.

Next, check the filter and make sure that it’s clean and free of debris. If the filter is dirty, replace it with a new one. Once the filter is changed, turn the power back on and check to see if the furnace is running. If not, check the blower motor and make sure it’s running as well.

If all these components are running, but the furnace isn’t producing warm air, it could be a sign of a more serious problem. Check the furnace’s flame sensor to make sure that it’s working properly. If it isn’t, clean or replace it as needed. If the flame sensor is working, check the furnace’s exhaust vent to make sure that it’s clear of any obstructions.

Finally, make sure that the furnace is receiving enough fuel. If the fuel supply isn’t sufficient, the furnace won’t be able to run efficiently. If the furnace is still not working, it’s best to seek the help of a professional furnace repair technician.

When to Seek Professional Assistance for Furnace Repair

While it is possible to identify when your furnace is malfunctioning and to make some repairs yourself, there are certain times when it is best to seek the assistance of a professional. Some of those times include:

1. When the furnace is making unusual noises, like a grinding or squealing sounds, or when it is producing smoke.

2. If you have tried to fix the issue yourself and it persists or worse, has become worse.

3. If you notice a strange smell coming from your furnace.

4. If the furnace is not producing enough heat or is cycling on and off frequently.

It is important to remember that furnace repair can be complicated and may require special tools or knowledge. If you do not feel comfortable making a repair yourself, it is best to call a professional. They will be able to diagnose the issue and make the necessary repairs quickly and safely.

Get Professional Help for Furnace Repair

No matter how knowledgeable you are about your furnace, it is always best to contact a professional to repair and maintain your furnace. A professional technician has the experience and expertise to diagnose and repair the furnace safely and correctly. With their help, you can ensure that your furnace is running safely and efficiently all season long.

Frequently Asked Question

The most common problems with furnaces are: Dirty ductwork. Old filters. Faulty starting mechanism.
The three most expensive parts on a furnace are the blower motor, the circuit board and the draft inducer.
Furnaces 20 years old or older become increasingly inefficient over time and can crack and leak, putting you and your family in danger. If your furnace is between 16 and 20 years old and constantly breaking down, then you should strongly consider having it replaced.
  • Poor temperature control.
  • Increasing illness symptoms
  • High furnace age
  • High heating bills without explanation
  • Strange noises
  • Pilot flame color changes
  • Dry air
  • Soot
  • Poor temperature control
A well-maintained furnace can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend its life even longer.
In general, it will cost $2,000 to $3,000 for a 40,000 to 60,000 BTU furnace for a 700 to 1,500 square foot home. For very large homes up to 5,000 square feet, you're looking at a cost closer to $6,500.
You can expect future maintenance to be more severe and frequent once a furnace has reached its life expectancy, which puts an unnecessary strain on your wallet. It's often more cost effective to install a brand new system than to patch an existing broken-down one.
Most furnaces have a lifespan of 20 to 30 years. However, this doesn't mean you can wait that long to replace yours. After about 15 years or so, you may need to consider a furnace replacement if your unit has been experiencing significant problems and requiring frequent repairs.