Welcome to Plumbing Emergency!
Ugent plumbing needs? Call us now to get connected to a plumber near you.
Plumbing Emergency Logo
Emergency Plumbing Guarantee
Call Our Plumber Experts!
(888) 675 2908

Why Isn't My Heater Kicking On?

Why Isn't My Heater Kicking On?

As the cold season approaches, many homeowners rely on their heating systems to keep their homes warm and comfortable. However, there may be times when you notice that your heater isn't kicking on as it should. This can be a cause for concern, especially during the colder months. 

In this article, we will explore some common reasons for “why isn’t my heater kicking on?” and provide troubleshooting tips to help you address the issue.

Common Reasons For A Heater Not Kicking On

  • Thermostat Issues: One of the most common reasons for a heater not turning on is a problem with the thermostat. Ensure that it's set to "heat" mode and that the temperature setting is higher than the current room temperature.

  • Clogged Or Dirty Air Filter: A clogged or dirty air filter can restrict airflow, causing the heater to work inefficiently or not turn on at all. Regularly checking and replacing the air filter can prevent this issue.

  • Lack Of Maintenance: Regular maintenance is crucial for the efficient functioning of your heating system. Neglecting maintenance can lead to various issues, including the heater not turning on.

  • Faulty Wiring: Bad wiring can prevent the heater from receiving the power it needs to operate.

  • Gas Line Issues: If there's an issue with your gas line or it's turned off, your heater won't ignite.

  • Pilot Light Problems: For heaters that use a pilot light, if the pilot light goes out or is faulty, the heater won't turn on.

  • Blower Capacitor Issues: A dead blower capacitor can prevent the heater from blowing air.

  • Refrigerant Levels: Low refrigerant levels can affect the heater's efficiency and its ability to turn on.

  • Faulty Ductwork: Improper ductwork installation or design can lead to heating inefficiencies.


If your are wondering “why isn’t my heater kicking on?”, here are some troubleshooting steps you can take:

 Check The Furnace Filter

A dirty or clogged furnace filter can restrict airflow and prevent your heater from working efficiently. It's essential to:

  1. Turn off the heater.

  2. Locate the furnace filter.

  3. Check if it's dirty or clogged.

  4. Replace the filter if necessary.

Regularly checking and replacing your furnace filter can ensure that your heater operates efficiently and prolongs its lifespan.

Verify The Circuit Breaker Is On

A tripped circuit breaker can cut off power to your heater, preventing it from turning on. To check the circuit breaker:

  1. Locate your home's electrical panel.

  2. Find the breaker labeled for your heating system.

  3. Ensure that it's in the "ON" position. If it's tripped, flip it back to the "ON" position.

If the breaker trips frequently, it may indicate a more significant electrical issue, and you should consult with a professional.

Ensure Proper Gas Supply To The Furnace

Ensuring a proper gas supply to your furnace is crucial for its efficient operation. The gas supplied to the building is typically more than the furnace can handle. Therefore, a gas regulator is usually installed at the gas meter to reduce the gas pressure, ensuring a consistent and safe gas supply to the burners. Maintaining the correct gas pressure is vital for furnace efficiency and to prevent overheating damage. If you suspect an issue with the gas supply:

  • Check The Gas Meter: Ensure that the gas meter is on and that the gas regulator is functioning correctly.

  • Inspect The Gas Pressure: If the furnace isn't working as expected, the gas pressure might be too high or too low. You can adjust the gas pressure by turning the gas pressure adjustment screw. However, it's recommended to consult with a professional before making any adjustments.

  • Safety First: Before performing any maintenance or checks on the furnace, always shut off the gas supply and power it off to prevent accidents.

Inspect For Gas Leaks

Gas leaks can be dangerous and should be addressed immediately. Here's how to check for a gas leak:

  • Smell: Natural gas has a distinctive rotten egg or sulfuric smell. If you detect this odor, it could indicate a gas leak.

  • Listen: A hissing or whistling noise near your gas lines or appliances might indicate a leak.

  • Soapy Water Test: Mix a teaspoon of soap into a cup of water to create a concentrated solution. Apply this solution to areas you suspect might be leaking. If bubbles appear, it indicates that gas is escaping from that area.

  • Professional Inspection: If you suspect a gas leak, it's essential to call a professional to inspect and repair the issue immediately. It's also advisable to evacuate the premises and turn off the main gas supply.

Examine The Pilot Light And Flame Sensor

The pilot light and flame sensor play crucial roles in the operation of gas furnaces:

  • Pilot Light: Its primary purpose is to provide the flame needed to light the gas coming out of the main burner. Ensure the pilot light is blue, which indicates complete combustion. A yellow or orange flame might suggest incomplete combustion and the presence of carbon monoxide.

  • Flame Sensor: This safety device detects the presence of a flame in a gas furnace. If the sensor doesn't detect a flame, it will shut off the gas supply to prevent a potential gas leak. Over time, the flame sensor can become dirty and might fail to detect the flame, even if it's present. Cleaning the sensor with light-grit sandpaper or emery cloth can often resolve this issue.

Test The Blower Motor And Heat Exchanger

The blower motor and heat exchanger are essential components of your furnace:

  1. Blower Motor: This component circulates air throughout your home. If the blower motor isn't working, you might notice reduced airflow or no airflow at all. To diagnose a faulty blower motor:

  • Ensure it's receiving power.

  • Check the attached capacitor to ensure it's functioning correctly.

  • Listen for unusual noises, which might indicate a problem.

  1. Heat Exchanger: This component heats the air that the blower motor circulates. A malfunctioning heat exchanger can lead to reduced heating efficiency. To test the heat exchanger:

  • Perform a visual inspection for cracks or damage.

  • Check for the presence of carbon monoxide, which can indicate a cracked heat exchanger.

  • Consult with a professional for a thorough inspection.

Confirm Proper Temperature Settings On Programmable Thermostats Or Common Furnace Unit

Programmable thermostats offer homeowners the convenience of automating their home's heating and cooling settings. Ensuring that these settings are correct is essential for both comfort and energy efficiency:

  • Understand Your Thermostat: Familiarize yourself with your thermostat's settings and functions. Some thermostats allow for daily or weekly programming, while others might offer more advanced features like geofencing or learning capabilities.

  • Recommended Settings: For optimal energy savings, the U.S. Department of Energy recommends setting your thermostat to around 68°F to 70°F while you're awake during winter and lowering it while you're asleep or away. In the summer, a setting of 76-78°F is recommended when you're home.

  • Check And Adjust: Periodically check to ensure that the thermostat's settings align with your schedule and comfort preferences. Remember, adjusting temperatures 5-8 degrees (down in winter, up in summer) when you're away can lead to significant energy savings.

  • Battery Life: Ensure that the thermostat's batteries are in good condition. A low battery can affect its performance and settings.

Check For Dirty Air Filters Or Clogged Ducts

Air filters and ducts play a crucial role in maintaining indoor air quality and ensuring the efficient operation of your HVAC system:

  1. Air Filters: A clogged or dirty air filter can restrict airflow, leading to reduced system efficiency and increased energy consumption. Check your air filter regularly and replace it as needed. A significant accumulation of dust around your home can be an indicator of a clogged filter.

  2. Duct Inspection: Over time, dust, debris, and other contaminants can accumulate in your ducts. To check for clogged ducts:

  • Remove the air vent cover and inspect the inside of the duct.

  • Open the return air vent and check for dust accumulations.

  • Regular duct cleaning can help maintain air quality and system efficiency.

Monitor Power Outages, Switches, And Safety Features

Power outages can impact the operation of your furnace and other household appliances:

  • Power Outages: If there's a power outage, your furnace might not operate until power is restored. Some furnaces come equipped with backup batteries to ensure continued operation during short outages.

  • Safety Switches: Modern furnaces come with safety switches that prevent the unit from operating under unsafe conditions. Ensure these switches are in the correct position and functioning properly.

  • Safety Features: Furnaces are equipped with various safety features, such as flame sensors and limit switches, to prevent accidents and malfunctions. Regularly inspect these features and consult with a professional if you suspect any issues.

Troubleshooting Your Heater

If you are trying to understand, “why isn’t my heater kicking on?”, there could be several reasons, and many of them can be addressed with simple troubleshooting steps. Regular maintenance and timely repairs can ensure that your heating system works efficiently throughout the cold season. If you're unsure about any of the steps or the problem persists, it's always best to consult with a heating professional. Regular maintenance and timely inspections can prevent many common furnace issues. If you're ever in doubt or suspect a problem with your heating system, always consult with a professional to ensure the safety and efficiency of your furnace.

Looking for the right heating solution for your home? Our detailed guide on heat pump vs. furnace can help you make an informed decision. Visit HVAC Of America and browse through the available resources to learn more.

With an entrepreneurial spirit and a profound understanding of the plumbing sector, Donald embarked on a mission to establish a company that would cater to the urgent needs of customers facing plumbing emergencies.
Looking For A Local Plumber In Your Area? Contact Us Now!
Plumbing Emergency Logo
© 2024 Plumbing Emergency. All Rights Reserved.
DMCA.com Protection Status
Our service is designed to assist homeowners in connecting with local plumbers at no cost. Please note that all plumbing contractors operate independently, and therefore we are unable to provide any warranty or guarantee for their work. It is the responsibility of the customer to ensure that the plumber possesses the necessary licensing and/or insurance before making a hiring decision.