How to fix the most common furnace problems?

furnace in the basement

Are you aware that some of the most common challenges with the furnace might be able to be addressed right at home without the services of a professional engineer? Yes! You might be able to fix problems with the furnace yourself.

So, whether your furnace is a high-efficiency gas furnace or a furnace that is conventional in nature, it is crucial to know how your heating/furnace system works. This implies the basic operating principles of the device, so that you can know where and what to be on the lookout for when issues arise.

The following must be firstly addressed while thinking on how to fix the most common furnace problems.

The owner’s manual must be readily available because it is in it that you will find the most specific details for your type of unit.

If the manual cannot be found, information can be accessed via the internet using the serial number, manufactured date, and model number on the unit. These details can be gotten on the manufacturer’s label on the furnace. Document them and have them handy.

Since we are dealing with an electrical device, it is wise to consult with furnace repair Dallas for them to help you. Also, you must think safety first by disconnecting from the power source before any interaction with it.

Let us consider the conventional furnace and how to fix the most common challenges associated with it.

Confirm If the Thermostat Is Powered On

This may look like an absurdity to you, but confirm the thermostat is currently set on ‘heat’, and it is placed at least 5⁰ above the ordinary room temperature.

Below are some of the pertinent steps to take while checking your Thermostat:

  • Check whether the battery is still okay if your Thermostat operates with batteries. It is recommended that you change the batteries a minimum of one-time yearly or as the need arises. Some other thermostats are connected to the house electrical system.
  • Gently remove screws from the Thermostat, open, and clean any debris or dust that might have accumulated.
  • If the system operates with a timer, ensure that the time and date are correctly set on all programmable or electronic models.
  • Use the power button to switch off the breaker if it is ‘ON’; also, be sure that the fuse of the furnace is still okay.

Furnace Not Creating Heat – Reset the Home Circuit Breaker

  • Firstly, you should adjust the Thermostat and ensure that it is on “heat,” and then try adjusting the dial to find out if there is a very conspicuous difference. If you cannot get any result, find out if the fuse or the circuit breaker is blown.
  • Checking the home breaker.
  • Open the home breaker panel; check whether the Circuit that powers the furnace is powered ‘ON’, ‘OFF’, or at the middle.
  • Flip the breaker back and forth and ensure that the breaker is at the ‘ON’ position.
  • Doing this will cause the resetting of the breaker, should in case it fails to work, it could mean you have an issue with the circuit breaker or maybe the circuit wiring.

If the Heat produced by the Furnace Is Not Sufficient – Assess and Replace Your Filter If It Is Clogged

There is a difference between a furnace that has stopped producing heat and the one not producing heat at all. So, if it is not providing enough heat, ensure that you maintain a clean and good air filter.

Replacing the filter is quite quick and straightforward; this task helps protect the components of HVAC and gives good quality air.

So, what to do?

Where is the filter located?

Some filters are located within intake parts, while some are situated right inside the furnace.

Examine the filter

This can be done by carrying it up to the light if the filter doesn’t permit light to shine through; it needs to be changed. You should replace your filter if you observe Dirty smell and dust dropping out of the vents when the blower is powered on.

Change the filter

See that you switch off power from the furnace, and air shouldn’t be allowed to go out. You must check the filter direction as installing it upside-down will negatively affect its effectiveness. The filter is made to trap the blown matters in one direction.

Check the Safety Switch on Furnace Door

In this case, the first step you should take is for you to assess the workability of your furnace by checking the safety switch which is placed on the furnace door. The safety switch is efficient in preventing the burner and fan from switching on whenever the panel is taken off.

So, the safety switch protrudes upwards whenever the door is not in place. It is imperative for the door to remain in its normal position so that the safety switch and furnace can function well.

Follow the steps below if there is a need for a new safety switch to be installed:

  • Power it off
  • Prep the door of the blower
  • Wiring of the safety switch
  • Check the installation and test run

If the Furnace Doesn’t Blow Air

So, it would help if you looked at the inspection window on the furnace, make sure that the blower is clear of debris. Watch the flashing light; red or green. Look at the manual to be sure.

Green means it’s okay, while red means there is a need for it to be serviced. No light means that there might be issues with the Thermostat, run capacitor, furnace control board, blower motor, or the transformer.

If the Furnace Is Noisy

This is not normal; this sound may translate into airflow reduction, mechanical problem, or a clogged burner. On the other hand, it could be beautiful but noisy. So, if you can determine if the noise is as a result of the air passing through the ductwork, then the way out is by insulating your ductwork to reduce the noise.

If the entire furnace system is producing odd noises, that means the pilot light is not well adjusted, or the lubrication ports of the blower motor need greasing. It could mean that the burner or the belts have issues too.

The Continuous Running of The Gas Furnace Blower

The continuous running of the gas furnace blower can be a sign that there is a need for repairs. Be sure that the Thermostat is not placed on a ‘continuous fan’. You could try by turning down the temperature to see if it would suffice.

A continually running furnace that doesn’t shut off could also indicate an issue with the faulty limit control switch, which might need to be replaced or reset.


It is highly recommended that you have your furnace checked periodically because it can prevent a minor repair from turning out to be a significant repair. I believe this article has exposed how to fix the most common furnace problems.

However, if the ideas shared don’t solve any of your problems or they are above your skilled capabilities, don’t hesitate to employ the services of a furnace repair professional.

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About the Author: James Watt

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