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Why Isn’t My New Furnace Heating? 7 Common Reasons


If you’ve recently had a new furnace or heater installed in your home and it’s not heating properly, you may be wondering why. One possible reason could be an issue with the air flow through the air ducts. Understanding the common reasons for a non-functioning furnace, heater or heat pump after installation is crucial to resolving the issue and getting your home warm and cozy again. Contact an HVAC pro for assistance. We’ll also guide you through troubleshooting common furnace problems step by step to accurately identify furnace repair issues and malfunctions. With our expert tips, you’ll learn how to efficiently resolve heating problems with your new gas furnace and propane heater.

Common Reasons Your Furnace Isn’t Working

Lack of Power Supply

One common reason why your new gas furnace may not be heating properly is due to a lack of power supply. This issue can often be resolved by checking the high limit switch and following the necessary step. If your gas furnace isn’t receiving the necessary electricity, contact an HVAC pro to troubleshoot the issue and take the necessary step to ensure it can generate heat. This can happen if there’s a problem with the circuit breaker or a blown fuse in your broken gas furnace. To fix this issue with your gas HVAC system, you’ll need to check the electrical panel and reset any tripped breakers or replace any blown fuses. It’s best to consult an HVAC pro for assistance with this. It’s also important to ensure that the gas furnace is properly plugged in and connected to a power source.

Malfunctioning Thermostat

Another culprit for your furnace not heating after installation could be a malfunctioning thermostat. The thermostat acts as the control center for your heating system, regulating when it turns on and off based on the desired temperature setting. If the thermostat is not functioning correctly, it may not send the signal to the furnace to start producing heat. In some cases, it may display incorrect temperature readings or fail to communicate with the furnace altogether. Troubleshooting steps for this issue include checking if the thermostat is set to “heat” mode, replacing batteries if applicable, and ensuring that it’s properly calibrated.

Clogged Air Filters

Clogged air filters can significantly impact your furnace’s performance by restricting airflow throughout your home. When air filters become dirty and clogged with dust, debris, and pet hair over time, they impede proper air circulation. As a result, less warm air reaches different areas of your house and affects overall heating efficiency. Regularly changing or cleaning air filters is essential in maintaining optimal airflow and preventing potential issues with your furnace.

Faulty Ignition Systems or Pilot Lights

Faulty ignition systems or pilot lights can also cause your new furnace not to produce heat as expected. These components are responsible for igniting the fuel within the furnace so that heat can be generated. If there’s a malfunction or the pilot light goes out, it can prevent the furnace from heating up properly. In some cases, you may need to relight the pilot light or call a professional technician to inspect and repair any issues with the ignition system.

By addressing these common issues, you can troubleshoot and potentially resolve why your new furnace isn’t heating after installation. Remember to always consult your furnace’s user manual for specific troubleshooting steps and safety precautions. If you’re unsure about performing any repairs yourself, it’s best to contact a qualified HVAC technician who can diagnose and fix the problem efficiently.

Simple Fixes for a Non-Functioning Heater

Check Circuit Breaker and Reset

If your new furnace isn’t heating up after installation, the first thing you should do is check the circuit breaker. Sometimes, the breaker can get tripped, causing a disruption in power supply to the heater. If you find that it has indeed tripped, simply reset it by flipping the switch back to its original position.

Ensure Thermostat Settings are Correct

Another common reason why your heater may not be working is due to incorrect thermostat settings. Make sure that your thermostat is set to “heat” mode for optimal furnace performance. Contact our top-rated furnace services in Portland today to ensure your home heating service is functioning at its best. Our experienced HVAC service contractors are here to help with all of your furnace installation needs. Trust the leading HVAC companies in the area for reliable and efficient service. Set your thermostat to the desired temperature and let us take care of the rest. Sometimes, people accidentally switch their thermostats to “cool” mode or forget to adjust the temperature settings, leading to a lack of heat in their homes.

Replace Dirty Air Filters

Dirty air filters can significantly impact the efficiency of your furnace and prevent it from heating properly. Over time, these filters can become clogged with dust, debris, and other particles, obstructing airflow and reducing heating performance. To resolve this issue, replace your dirty air filters with clean ones regularly. This simple step can greatly improve airflow and help restore proper heating functionality.

Verify Open Vents for Optimal Heat Distribution

To ensure that heat is evenly distributed throughout your home, it’s important to check if all vents are open and unobstructed. Closed or blocked vents can disrupt airflow and prevent warm air from reaching certain areas of your house. Take a moment to inspect each vent in every room and make sure they are fully open without any obstructions such as furniture or rugs covering them.

Seek Professional Help if Issues Persist

If you’ve tried these simple fixes but your furnace still isn’t working properly, it may be time to seek professional help. A licensed HVAC technician will have the expertise required to diagnose and repair any underlying issues with your heating system. Attempting complex repairs without proper knowledge and experience can potentially cause further damage or even pose safety hazards.

It’s important to note that while these simple fixes can often resolve common issues with non-functioning heaters, there may be other underlying problems that require professional attention. HVAC systems are complex devices, and it’s always best to consult a qualified technician for any significant repairs or maintenance.

Remember,It’s essential to troubleshoot the issue systematically. Check the circuit breaker, ensure correct thermostat settings, replace dirty air filters, and verify open vents. If all else fails, don’t hesitate to call in the professionals for assistance.

Troubleshooting: No Heat Coming out of Your Furnace

If you’ve recently had a new furnace installed and it’s not heating your home, don’t panic just yet. There could be a few reasons why your furnace isn’t producing heat, and with some troubleshooting, you may be able to identify and resolve the issue. Here are some steps you can take to get to the bottom of the problem:

Inspect the blower motor for any signs of damage or malfunction.

The blower motor is responsible for circulating warm air throughout your home. If it’s not functioning properly, it could be the reason why your furnace isn’t producing heat. Take a look at the blower motor and check for any visible signs of damage or wear. If you notice anything unusual, it may be time to call in an HVAC technician to repair or replace the motor.

Check if there is a blockage in the ductwork preventing warm air circulation.

Sometimes, blockages in the ductwork can prevent warm air from reaching all areas of your home. Inspect your ducts for any obstructions such as debris or furniture blocking airflow. Make sure that all vents are open and unobstructed. Clearing any blockages should help improve heat distribution throughout your home.

Test the limit switch to ensure it’s functioning correctly and allowing heat flow.

The limit switch is a safety feature that shuts off the burner if the temperature inside the furnace gets too high. However, if this switch malfunctions or gets stuck in the off position, it can prevent heat from being produced. Locate the limit switch on your furnace and test it by gently tapping on it or resetting it according to manufacturer instructions. If this doesn’t solve the issue, consult an HVAC technician for further assistance.

Examine the gas supply line for leaks or issues affecting fuel delivery.

If your furnace runs on natural gas or propane, a problem with the gas supply line could be the culprit behind the lack of heat. Inspect the gas supply line for any leaks or damage that may be affecting fuel delivery to your furnace. If you suspect a gas leak in your home heating system, it’s important to contact a top-rated furnace services professional in Portland immediately for safety reasons. They are experienced in HVAC service contractor and can quickly address any issues related to furnace install. Don’t delay in reaching out to one of the reputable HVAC companies in your area.

Remember, troubleshooting your furnace requires caution and expertise. If you’re unsure about any of these steps or if the issue persists after attempting them, it’s best to call in an HVAC technician. They have the knowledge and experience to diagnose and repair complex issues with your heating system.

By addressing these common troubleshooting points, you’ll be well on your way to understanding why your new furnace isn’t producing heat. Keep in mind that regular maintenance and servicing by a qualified technician can help prevent these issues from occurring in the first place.

Checking Flame Sensor and Pressure Switch

To troubleshoot why your new furnace isn’t heating after installation, it’s essential to check the flame sensor and pressure switch. These two components play a crucial role in ensuring the proper functioning of your furnace. Here are some steps you can take to address any issues with them:

Clean the Flame Sensor using Fine-Grit Sandpaper

Over time, the flame sensor in your furnace can accumulate carbon buildup, which may prevent it from detecting the flame properly. To remedy this, you can use fine-grit sandpaper to gently clean the sensor. Make sure to disconnect power to the furnace before attempting any maintenance.

Test the Pressure Switch for Continuity using a Multimeter Tool

The pressure switch is responsible for verifying that there is adequate airflow in the furnace before allowing it to ignite. If there is an issue with this component, it may not signal the gas valve to open, resulting in no heat being produced. To test its continuity, you can utilize a multimeter tool. This will help determine if the pressure switch is faulty or not.

Ensure Proper Connection and Secure Mounting

It’s crucial to ensure that both the flame sensor and pressure switch are correctly connected and securely mounted in place. Loose connections or improper mounting can lead to malfunctioning or erratic behavior of these components. Double-check all wiring connections and mounting brackets to ensure they are tight and secure.

Replace Faulty Flame Sensors or Pressure Switches as Needed

If cleaning or testing reveals that either the flame sensor or pressure switch is faulty, replacement might be necessary. Faulty sensors or switches can impede proper functioning of your furnace and prevent it from heating up effectively. Consult with a professional technician or refer to your furnace’s manual for guidance on finding suitable replacements.

By addressing potential issues with these critical components – namely, cleaning the flame sensor, testing the pressure switch for continuity, ensuring proper connection and secure mounting, and replacing faulty sensors or switches – you can increase the chances of resolving the heating problem with your new furnace. Remember to exercise caution when performing any maintenance tasks and seek professional assistance if needed.

Adjusting Thermostat Settings and Checking Power

To troubleshoot why your new furnace isn’t heating after installation, there are a few key areas to address. One of the first things you should check is the thermostat settings. Ensure that they accurately match the desired temperature settings. If the thermostat is set to “cool” instead of “heat,” it won’t activate the furnace.

It’s crucial to verify the power supply connections from both the electrical panel and the furnace unit itself. Make sure all wiring is securely connected and undamaged. Loose or faulty wiring can prevent your furnace from receiving power and functioning properly.

If your thermostat operates on batteries, replacing them might also solve any issues you’re experiencing. Weak or dead batteries can cause communication problems between the thermostat and furnace, leading to heating malfunctions.

Consider upgrading to a programmable thermostat for better control over your HVAC system’s temperature settings and increased energy efficiency. Programmable thermostats allow you to schedule temperature changes throughout the day, ensuring optimal comfort while reducing energy consumption when no one is home.

Remember that regular maintenance plays a vital role in keeping your furnace running smoothly. Dust and debris can accumulate on thermostats over time, affecting their accuracy. Clean your thermostat regularly by gently wiping it with a soft cloth.

In some cases, a faulty capacitor may be causing problems with your new furnace’s heating capabilities. The capacitor helps provide an extra boost of power to start up the motor in your HVAC system. If it fails or becomes weak, it can hinder proper heating operation.

It’s worth mentioning that if these troubleshooting steps don’t resolve the issue, it may be necessary to consult a professional HVAC technician for further assistance. They have specialized knowledge and tools to diagnose and address more complex problems with furnaces.

To summarize:

  • Ensure that your thermostat settings accurately match your desired temperature.

  • Verify all power supply connections from both electrical panel and furnace unit.

  • Replace batteries in your thermostat if applicable.

  • Consider upgrading to a programmable thermostat for better control and energy efficiency.

  • Perform regular maintenance, including cleaning the thermostat.

  • Consult a professional HVAC technician if troubleshooting steps don’t resolve the issue.

Clearing Exhaust Flue and Intake/Exhaust Vents

To troubleshoot why your new furnace isn’t heating properly after installation, it’s essential to inspect the exhaust flue and intake/exhaust vents. These components play a crucial role in ensuring proper airflow and ventilation for your furnace.

Inspect the exhaust flue for any obstructions or blockages that may hinder proper airflow.

Check the exhaust flue to ensure there are no obstacles like debris, bird nests, or other objects blocking the path of exhaust gases. These blockages can restrict the flow of air, leading to inefficient heating. If you notice any obstructions, it’s important to remove them carefully.

Clean intake/exhaust vents to remove debris, dust, or ice buildup.

Inspect the intake and exhaust vents for any accumulation of dirt, dust, or ice. Over time, these substances can accumulate and impede airflow. Use a soft brush or cloth to gently clean the vents and remove any debris present. Be cautious not to damage the vents while cleaning.

Ensure that vent pipes are properly installed and not damaged or disconnected.

Check if the vent pipes are correctly installed and securely connected to both the furnace and external outlets. Any gaps or disconnections in the vent system can lead to heat loss and reduced efficiency. If you find any damages or disconnections, it is advisable to consult a professional technician who can repair or replace them as needed.

Consider professional cleaning of the entire ventilation system for optimal performance.

If you’ve tried inspecting and cleaning individual components but still experience heating issues with your new furnace, it may be beneficial to consider professional cleaning of your entire ventilation system. Over time, air ducts can accumulate dirt, dust, mold spores, or other contaminants that obstruct airflow. A thorough cleaning by professionals ensures improved air quality and efficient operation of your furnace.

Inspecting Ignition Switch and Pilot Light

To troubleshoot why your new furnace isn’t heating after installation, it’s crucial to inspect the ignition switch and pilot light. These components play a vital role in initiating the heating process. Here are some key points to consider:

Check Electrical Continuity of Ignition Switch

Start by examining the ignition switch to ensure it is functioning correctly. This switch is responsible for activating the furnace’s burner when heat is required. To test its electrical continuity, follow these steps:

  1. Locate the circuit breaker that controls power to the furnace.

  2. Flip the circuit breaker off and then back on to reset it.

  3. Turn on the thermostat and set it to a temperature higher than the current room temperature.

  4. Listen for any clicking sounds near the furnace as you adjust the thermostat.

If you don’t hear a click, it could indicate an issue with the ignition switch or its electrical connection. In such cases, it is advisable to consult a professional technician for further assistance.

Verify Pilot Light Functionality

The pilot light is another critical component that needs inspection. It serves as a safety feature and ignites the main burner when heat is required. Follow these steps to verify if your pilot light is lit and producing a steady flame:

  1. Locate the front panel of your furnace.

  2. Remove this panel carefully according to your furnace manufacturer’s instructions.

  3. Look for a small flame inside—this indicates that your pilot light is lit.

  4. Observe if the flame remains steady or flickers excessively.

A steady flame signifies proper functioning, while excessive flickering may indicate an issue with gas flow or clogged orifices.

Clean or Replace Clogged Pilot Light Orifices

Clogged pilot light orifices can impede proper gas flow, resulting in heating issues with your furnace. If you suspect clogging, follow these steps:

  1. Turn off the furnace and ensure the pilot light is extinguished.

  2. Locate the orifices, which are small holes where gas flows into the pilot light assembly.

  3. Use a soft brush or compressed air to clean any debris or buildup from these orifices.

  4. If cleaning doesn’t resolve the issue, consider replacing the clogged orifices.

Regular maintenance of your furnace, including cleaning or replacing clogged pilot light orifices, can help ensure efficient heating performance.

Remember, if issues persist with ignition switches or pilot lights after performing these inspections and maintenance steps, it’s best to seek professional assistance. HVAC technicians have the expertise to diagnose and repair complex furnace problems effectively.

Resolving Furnace Heating Problems

We discussed simple fixes you can try, such as adjusting thermostat settings and checking power connections. We delved into more troubleshooting steps like inspecting the flame sensor and pressure switch, clearing exhaust flue and intake/exhaust vents, as well as examining the ignition switch and pilot light.

To ensure your furnace operates efficiently and provides the warmth you need during colder months, it is crucial to address any heating problems promptly. If you have exhausted all the troubleshooting steps mentioned above and are still experiencing issues with your furnace’s heating capabilities, it is recommended to seek professional assistance from a qualified HVAC technician. They will possess the expertise to diagnose and resolve complex furnace problems effectively.

FAQs about Furnace Heating Issues

How often should I change my furnace filter?

It is generally recommended to replace your furnace filter every three months or sooner if it becomes dirty or clogged. Regularly changing the filter helps maintain proper airflow through the system, improving both efficiency and indoor air quality.

Can a faulty thermostat cause my furnace to stop heating?

Yes, a malfunctioning thermostat can prevent your furnace from providing heat. If your thermostat isn’t accurately reading room temperature or sending signals to activate the heating cycle, it may need repair or replacement.

Why does my furnace make strange noises when running?

Unusual noises coming from your furnace could indicate underlying issues such as loose components or a malfunctioning blower motor. It is advisable to have a professional inspect and repair any unusual sounds for optimal performance.

What is short cycling in furnaces?

Short cycling refers to when a furnace turns on and off frequently without completing a full heating cycle. This issue can be caused by various factors including an oversized unit, faulty thermostat, or clogged air filter. A professional technician can diagnose the exact cause and provide appropriate solutions.

How long should a furnace last?

The average lifespan of a well-maintained furnace is around 15 to 20 years. However, factors such as regular maintenance, usage patterns, and the quality of installation can impact its longevity. It is important to schedule annual inspections and perform necessary upkeep to extend the life of your furnace.

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