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Top 5 Furnace Problems and How to Fix Them

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💫 Short Summary

In the video, the presenter discusses the five most common furnace problems and how to fix them, starting with a dirty flame sensor as the most common issue. They demonstrate the symptoms of a dirty flame sensor and provide a step-by-step guide on how to clean it to resolve the problem. Furnace Troubleshooting: 4 Common Furnace Problems" discusses four common furnace issues, including a dirty furnace filter, a bad inducer motor, and a bad blower motor, and their symptoms and solutions. The video provides demonstrations and tips for troubleshooting and replacing these components. In this video, the narrator discusses five common furnace problems, including a faulty igniter, dirty flame sensor, bad pressure switch, overheating, and a bad control board. He explains the symptoms of each issue and provides insights on troubleshooting and potential solutions. The narrator emphasizes the importance of proper maintenance and the use of a meter for checking control boards. He also mentions that some control boards may blink an error code to indicate a need for replacement.

✨ Highlights
📊 Transcript
Introduction to Common Furnace Problems
00:00
The video will cover the five most common furnace problems and how to fix them.
The symptoms of each problem will be demonstrated, starting with the scenario when the furnace is not running despite the thermostat being set to heat.
Problem 1: Dirty Flame Sensor
01:57
When the furnace is turned on, the flames only last for about three seconds, indicating a dirty flame sensor.
Cleaning the flame sensor with a scotch brite pad or dishwashing scrubby should fix the issue.
The flame sensor is a metal rod located in front of the burners, usually held in place by a quarter inch screw.
Build-up on the flame sensor prevents it from sensing the flame, leading to the gas valve turning off and the flames going out.
After cleaning the flame sensor, the furnace should stay on for a longer duration when turned back on.
Problem 2: Less Common Issue
07:52
The second problem is mentioned to be less common than the dirty flame sensor issue, but it is not further elaborated in the provided captions.
Dirty furnace filter is a common problem that can cause the furnace to not keep up with the set temperature.
08:00
Dirty furnace filters can cause the furnace to overheat and shut off the flames.
An overheating furnace due to a dirty filter can result in the high limit switch turning off the furnace.
A dirty filter restricts airflow, leading to the furnace overheating and the fan staying on to cool it off.
Inducer motor is the third most common problem, with symptoms including a blinking pressure switch open code and the furnace doing nothing.
11:00
Check if the inducer motor is getting power and not starting, indicating a problem.
A hot inducer motor when the thermostat is set to heat and the furnace is not running is a sign of a bad motor.
Replacing the inducer motor may solve the issue if something is stuck in the blower wheel.
The fourth most common problem is a bad blower motor, which can be identified by a burnt plastic or electric smell.
13:00
The blower motor should come on 20-30 seconds after the burners light, so if it doesn't, there may be a problem.
A hot blower motor when the power is off to the furnace indicates it needs replacement.
Check if the Control Board is sending power to the blower motor to determine if it's the cause of the problem.
Proper sequence of operation for a furnace
16:00
The sequence starts with the inducer motor coming on.
Next, the igniter starts to glow and the gas valve opens.
Then, the burners light up, and the blower motor comes on after a certain delay, usually 20-45 seconds.
💫 FAQs about This YouTube Video

1. What is the most common furnace problem shown in the video?

The most common furnace problem shown in the video is a dirty flame sensor, which causes the furnace to light for a few seconds and then go out.

2. How can the problem of a dirty flame sensor be fixed?

The problem of a dirty flame sensor can be fixed by cleaning the flame sensor with a scotch brite pad or a dishwashing scrubby to remove the buildup that is causing it to malfunction.

3. What is the symptom of a dirty flame sensor in a furnace?

The symptom of a dirty flame sensor in a furnace is the flames lighting up for a few seconds and then going out, leading to the furnace not staying lit.

4. Why is it important to check the error code on the furnace's control board when troubleshooting furnace problems?

It is important to check the error code on the furnace's control board when troubleshooting furnace problems because it provides valuable information about the nature of the issue, allowing for more targeted and effective solutions.

5. What should be done before attempting to reset the power to a furnace that is not working correctly?

Before attempting to reset the power to a furnace that is not working correctly, it is important to check the error code on the furnace's control board and to understand its meaning, as resetting the power may temporarily resolve the issue and obscure the underlying problem.

6. What is the second most common problem with furnaces?

The second most common problem with furnaces is a dirty furnace filter, which can cause the furnace to not keep up with the set temperature and potentially lead to overheating.

7. How does a dirty furnace filter affect the furnace?

A dirty furnace filter can cause the furnace to not keep up with the set temperature and potentially lead to overheating, as it restricts airflow and can result in the high limit switch shutting off the furnace.

8. What are the symptoms of a dirty furnace filter?

If the furnace is unable to reach the set temperature or constantly overheats, it may be a symptom of a dirty furnace filter, which restricts airflow and affects the furnace's performance.

9. How can a dirty furnace filter be identified as the problem?

If the furnace is struggling to maintain the set temperature and there are no other apparent issues, a dirty furnace filter could be the likely culprit and should be checked and replaced if necessary.

10. What can happen if a furnace filter is not replaced for a long time?

Not replacing the furnace filter for a long time can lead to decreased furnace performance, overheating, and potential damage if the airflow is significantly restricted, impacting the overall heating system.

11. What are the common problems associated with a bad control board in a furnace?

The common problems associated with a bad control board in a furnace include the blower motor not turning on, the igniter not receiving power, the inducer motor not receiving power, and the control board potentially causing the air conditioner and furnace to turn on simultaneously.

12. How can a bad control board in a furnace be identified?

A bad control board in a furnace can be identified by checking if it is receiving power but not sending power out. It may also display an error code indicating the need for replacement.

13. What is the sequence of operation for a furnace working normally?

The sequence of operation for a furnace working normally is the inducer motor coming on first, followed by the igniter glowing, the gas valve opening, the burners lighting, and the blower motor coming on after a certain period.

14. What can happen if the control board in a furnace is faulty?

If the control board in a furnace is faulty, it can lead to various issues such as the blower motor not turning on, the igniter not receiving power, the inducer motor not receiving power, and potentially causing the air conditioner and furnace to turn on simultaneously.

15. How important is it to troubleshoot a furnace control board with a meter?

It is important to troubleshoot a furnace control board with a meter to verify if it is receiving power and sending power out, determining if the control board is indeed faulty.