Air Texas A/C & Heating

What to Do When Your Furnace Won't Kick On

What to Do When Your Furnace Won't Kick On

Before you panic or call for professional help, explore the components constituting a furnace and learn about our five steps to diagnose and potentially resolve the issue yourself.

  1. Check Your Thermostat
  2. Inspect the Power Supply
  3. Examine the Air Filter
  4. Check the Pilot Light or Ignition System
  5. Inspect the Gas Supply

5 Steps to Troubleshooting Your Furnace

As the temperatures drop outside, the last thing you want is for your furnace to decide it´s taking an unscheduled vacation. Discovering your furnace isn´t kicking on can be frustrating and concerning, mainly if you rely on it to keep your home warm and cozy during the chilly month.

1. Check Your Thermostat

The first step in troubleshooting a furnace that won´t kick on is to check your thermostat.

Check that it´s set to “heat” and that the temperature is higher than the room temperature.

Sometimes, an effortless adjustment or replacing the batteries in a digital thermostat can solve the problem.

If your thermostat runs on batteries, replacing them could be a quick fix you hadn´t considered.

2. Inspect the Power Supply

Next, verify that your furnace is getting energy power. Check the device or fuse box to ensure that the breaker hasn´t tripped or the fuse hasn´t blown.

Furnaces are usually on their circuit, so look for any switches that may have been accidentally turned off.

If you find a tripped breaker, reset it and see if this resolves the issue.

3. Examine the Air Purifier

A plugged air filter can cause numerous problems with your HVAC system, including preventing your furnace from turning on.

A dirty filter restricts airflow, leading to overheating and automatic shut-off to prevent damage.

Locate and inspect your furnace´s air filter (usually near the return air duct or blower compartment).

If it´s dirty or clogged with dust and debris, replace it with a new filter. Regularly replacing your air filter every 1-3 months can help prevent future issues and keep your furnace running efficiently.

4. Check the Pilot Light or Ignition System

For older gas furnaces, check the pilot light. If it´s out, follow your furnace manufacturer´s instructions to relight safely.

Newer furnaces use electronic ignition systems that might need troubleshooting if they fail to ignite.

Listen for clicking sounds or look for indicator lights that might signal an ignition problem.

Refer to your furnace´s manual for guidance on resetting or troubleshooting the ignition system.

5. Inspect the Gas Supply

Ensure the gas supply is on if your furnace works on natural gas or propane. Check other gas appliances in your home, such as a gas stove or water heater, to see if they are working.

If you suspect a problem with the gas supply, contact your gas company immediately for assistance.

Consider the Age and Maintenance of Your Furnace

Your furnace’s age and maintenance history can also significantly affect its performance.

Suppose your furnace is older and hasn´t been serviced recently. In that case, it may have worn-out components or need cleaning, or you may need a new one. So you can explore some of the best furnace brands renowned for their reliability, efficiency, and innovation by clicking on our blog post: 6 Best Furnace Brands | 2024 List!

Systematic maintenance by a qualified HVAC technician can help extend the life of your furnace and catch potential problems before they leave you in the cold.

When to Call a Professional

If you´ve followed these troubleshooting steps and your furnace still doesn´t turn on, it may be time to call a professional HVAC specialist.

They have the competence and tools to identify and mend more complex issues with your furnace.

Faulty blower motors, issues with the thermostat wiring, or problems with the furnace´s control board are common problems that require professional attention.

Let a Pro Handle Your Furnace If You Fail to Solve the Issue

Dealing with a furnace that won´t kick on can be frustrating, mainly during the colder months when you rely on it most.

Following these troubleshooting tips, you can often identify and resolve the problem without expert help. But professional help is sometimes required.

Remember to regularly maintain your furnace and address issues promptly to ensure it keeps your home warm and comfortable for years to come.

If all else fails, don´t hesitate to contact a licensed HVAC operator who can help you get your furnace up and running again.

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