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If you notice your furnace blower is running constantly, you are not alone. This is one of the most common issues Pennsylvania homeowners encounter. But there is nothing to worry about, as it can be fixed with a few DIY steps. If the culprit is a faulty component, you need a professional to fix it. But that too is not very complex. In simple terms, you can get your heat restored on the same day, provided you choose a professional service with the right strategy.
In this guide, we will walk you through the core causes of why your furnace blower won’t stop. We will also disclose expert tips from Lehigh HVAC to fix such issues in the future.
This minor thermostat setting oversight keeps the blower fan running. Many homeowners set the thermostat to "ON" instead of "AUTO." This setting keeps the fan running continuously, regardless of the temperature achieved or whether the system is actually generating heat. The simplest fix is to check the thermostat and turn it back to "AUTO" if it was mistakenly set before.
An air filter’s job is to remove the dirt and particles from the air before it circulates in your living space. Beyond filtration, it ensures proper airflow, which the furnace needs to operate normally. When filters are blocked, this airflow is disrupted. It makes the system work harder than its capacity and causes it to overheat. The fan then runs continuously to cool the system.
Check your air filters and replace them if you find them dirty. This usually takes you 5 to 10 minutes. If you are a busy professional and want to avoid this headache, you can call Lehigh HVAC for air filter replacement service in Pennsylvania.
A limit switch is a safety switch that turns the furnace off once it reaches the desired temperature. If this switch is itself faulty, it reads the incorrect temperature and keeps the blower running regardless of the temperature achieved in the setting. Test and replace the limit switch if it is faulty.
The control board is the brain of the heating system. It sends signals to the components and keeps them working according to the temperature needs. When the control board is faulty, it can’t interpret the signals received from the thermostat the right way. The result is that the control board keeps the system running, including the blower.
If the blower motor is old, corroded, or severely damaged, it might get stuck in the "ON" position regardless of what signals are sent from the thermostat and the control board. This forces the blower to keep running even if it is not receiving fresh, warm air from the ignition components. To fix it, inspect the motor and replace it if required.
With care and maintenance, you can prevent such issues. The tips are pretty simple. Keep a close eye on the furnace components. Clean them in a timely manner, prevent damage, and replace them when any component is heavily damaged.
Here is what Lehigh HVAC recommends in this regard.
Replace air filters regularly every 1 to 3 months
Schedule annual professional HVAC maintenance and inspections
Keep air vents and return grilles unblocked and clean
Verify thermostat settings and replace batteries as needed
Clean ductwork and heat exchangers periodically
Inspect the blower motor and belt for wear
Test safety limit switches and flame sensors annually
If you are having trouble with a furnace that won’t stop running, feel free to reach out to us for furnace repair service. We serve the entire state of Pennsylvania, ensuring expert workmanship, affordable pricing, and 0% financing options through GreenSky. Contact us at 484-961-7044 for bookings.
