Why Is My Furnace Not Turning On? 

Nov 1, 2024 | Circuit Breaker, Air Filter, Drain Pan, Ducts, Furnace, Heating, Power Source, Thermostat, Troubleshooting

If your furnace isn’t turning on, there’s no need to panic; we have a set of straightforward troubleshooting steps for you. With winter almost upon us, ensuring your furnace operates smoothly is crucial for maintaining a warm and cozy home. 

Before reaching out to your Westerville Air Conditioning & Heating professionals, remember that there are several common factors that might be causing your heating system to malfunction. Here’s a quick troubleshooting guide to help you identify and resolve the issue. 

Check the Power Source If Your Furnace Is Not Powering On 

Start by verifying the power source—this is a fundamental step in troubleshooting. Depending on your furnace type, you may need to inspect either the circuit breaker or the fuel supply. 

The Circuit Breaker: If your furnace operates on electricity, check the circuit breaker. A tripped breaker could be cutting off power to your heating system. Examine your electrical panel for any switches that are in the “off” position or positioned between “on” and “off.” It’s not uncommon for a breaker to appear on but actually be in the middle position, indicating it’s turned off. 

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To reset a tripped breaker, flip it fully to “off” and then back to “on.” If it trips again, an underlying electrical issue may exist that requires professional attention. Additionally, circuit breakers can wear out over time, so if this is a recurring problem, consider consulting a professional about circuit breaker repair or replacement. 

Check the Natural Gas or Oil Supply: For furnaces that rely on fuel, ensure a steady fuel supply for proper operation. Issues like a closed valve or an empty oil tank can prevent your furnace from starting. While you can safely verify the gas valve position, if you suspect gas pressure issues, we recommend leaving this to the experts. 

By following these steps, you can effectively troubleshoot common furnace issues. If problems persist, don’t hesitate to reach out to us for professional assistance. Your comfort is our priority, and we’re here to help! 

Check the Thermostat If Your Furnace Is Not Powering On  

First, let’s ensure your thermostat is functioning properly, as it serves as the command center for your HVAC system. If your furnace isn’t powering on, the issue could be an easy fix related to the thermostat. Confirm that your thermostat is set to “heat” and that the temperature setting exceeds the current room temperature, allowing your heating system to operate effectively.

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In some cases, the thermostat may not be functioning properly. If applicable, check and replace the batteries. If the thermostat remains unresponsive, it may be time to consult an HVAC technician for a professional diagnosis.  

Check the Air Filters If Your Furnace Is Not Powering On  

Next, consider your HVAC system’s air filters. A clogged air filter, while seemingly minor, can significantly impact your furnace’s performance. When the air filter is dirty, it restricts airflow, leading the furnace to overheat and shut down as a safety precaution. Therefore, checking your air filters is a wise step if the issue persists.  

If the filter is dirty, replace it with a new one. Regular maintenance is crucial; ideally, you should change the air filter every 1-3 months to enhance your HVAC system’s efficiency and extend its lifespan.  

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Check if the Ducts are Blocked If Your Furnace Is Not Powering On  

Did you know that blocked ducts can hinder your furnace’s operation? When airflow is obstructed, the furnace may interpret this as a malfunction and shut down as a safety measure. Objects lodged in the ductwork can trigger this response, preventing the furnace from turning on.  

Some furnace models are designed with this safety feature to help prevent carbon monoxide poisoning in the home. Ensure any obstructions are cleared promptly to maintain your safety and the furnace’s functionality.  

Check the Drain Pan If Your Furnace Is Not Turning On  

Modern furnaces are equipped with safety features, such as a drain pan that prevents operation if it collects excessive moisture. If your furnace issue persists, locate the drain pan (typically beneath the furnace) and carefully empty it if it’s full of water.  

If you notice the drain pan frequently fills up, this may indicate a problem with your HVAC system’s drainage, warranting a call to our team for assistance.  

Let’s Wrap It Up  

Facing a furnace that won’t turn on can be frustrating, but most issues can be resolved by following these troubleshooting steps. By checking the circuit breaker, thermostat, air filter, ducts, drain pan, pilot light, and fuel supply, you can often identify and rectify the problem independently.  

However, if these steps do not resolve your furnace issues, remember that your Westerville Air Conditioning & Heating team is here to help. With our expertise in furnace repair and maintenance, we are equipped to restore your furnace’s functionality quickly and efficiently. Don’t hesitate to reach out for assistance with all your home service needs! 

Don’t hesitate to reach out to us. You can contact Westerville Air Conditioning & Heating today at (614) 810-0075, or schedule an appointment online now by clicking here