If your furnace fan is constantly running but your Boise home isn’t as warm as it should be, don’t ignore the problem. You might need the expert furnace technicians at Express Plumbing, Heating, and Air to replace a faulty limit switch.
What Is a Furnace Limit Switch?
A limit switch is an essential safety device located in your furnace’s combustion chamber or heat exchanger. If the blower motor isn’t running, it could mean the furnace’s temperature has exceeded a preset limit. When this happens, the limit switch is activated, turning your furnace and blower fan off.
If the limit switch turns off your furnace, you’ll need to reset it before it can operate again. There are two reset types: manual reset and automatic reset. The reset button pops out when activated. Depending on your furnace’s age and model, it could be located in a number of places. Often, it’s located inside the air handler, which is usually next to your furnace.
However, if your furnace limit switch is repeatedly activated, it can shut your furnace off completely, and you won’t be unable to reset it. If you experience a limit switch or furnace problem, call the Express Plumbing team and we’ll quickly address the issue.
Signs of a Faulty Limit Switch
One symptom of a bad limit switch is higher heating bills due to an inefficient furnace. Most importantly, a faulty limit switch is a potential safety hazard. If it’s not operating properly, temperatures could cause your furnace to overheat enough to melt components and even cause a fire.
Some signs of a faulty limit switch include:
- Blower won’t stop running: The blower may continue to run even after the furnace has stopped.
- Furnace short cycling: A faulty limit switch may cause your furnace to shut down constantly.
- Furnace not heating: A faulty limit switch can prevent your furnace from maintaining temperature.
- Error codes on your thermostat: If your furnace is circulating cold air or the reset button has been tripped, you may get error codes.
- Increased heating bills: A faulty limit switch prevents your furnace from running efficiently and may increase your heating bill.
Troubleshooting a Faulty Limit Switch
There are a few simple steps you can take to troubleshoot a suspected limit switch problem. If you’re comfortable investigating the problem yourself, here are some troubleshooting steps you can try:
- Reset the limit switch: Turn your furnace off for a few minutes, then turn it back on.
- Dirty air filter: If you think your limit switch isn’t working properly, replacing the filter is a good place to start.
- Check wiring: Locate the limit switch and check if all the wiring is properly connected.
- Check the fan: Make sure the fan is properly connected and there are no obstructions.
- Check the temperature sensor: Use a cloth to gently wipe away any dust or debris that might prevent the sensor from getting an accurate reading.
- Check for signs of wear and tear. If your furnace is old, rusty, or keeps breaking, it can impact its operation.
When To Replace a Faulty Limit Switch?
You’ve tried resetting your limit switch and troubleshooting the problem, but your home is still cold. You might wonder how you can tell if you need a faulty limit switch replacement for your furnace or if the issue is something else.
The only way to know if the limit switch is the problem is a furnace limit switch replacement. If replacement doesn’t solve the problem, you’ll know it wasn’t the limit switch. Call the certified technicians at Express to quickly diagnose the issue. It could be a quick fix or a more substantial furnace repair.
Why Professional Help Is Recommended
A furnace is a complex piece of machinery. If handled improperly, you may cause it to run inefficiently or create a safety hazard. It’s recommended that you contact a certified technician for a faulty limit switch.
Preventing Limit Switch Failures
There are many causes of a limit switch failure. It’s a good idea to regularly inspect and maintain your furnace’s limit switch function and your furnace in general. Keeping your limit switch free of dust and debris helps prevent problems before they start.
Join our Express VIP Club for a bi-annual tune-up of your HVAC system (heating, ventilation, and cooling) and an annual plumbing inspection. We’ll catch potential problems, keep your furnace running efficiently, and save you money over time.
Contact Us for Your Faulty Limit Switch Replacement
Don’t jeopardize your home’s warmth and comfort. If your limit switch is broken or your furnace is malfunctioning, contact Express Plumbing, Heating, and Air, your local Boise HVAC experts. We’ll quickly diagnose the problem and get your furnace up and running with minimal disruption.
Frequently Asked Questions
Do you offer financing?
Yes, we have multiple financing options to fit your budget.
Are your furnace technicians certified?
Yes! Our extensively trained contractors are North American Technician Excellence certified.
How long should my furnace last?
Your furnace can last up to 30 years with proper care and maintenance. However, if it’s 15 years or older and you’re experiencing problems, it could be time for a new unit.
How often should I change my furnace filter?
Generally, you should change your filter every three months, but if your furnace isn’t operating efficiently, you may need to change it more frequently.
Do you offer energy-efficient heating options?
Yes! We install Energy Star-rated heating systems. This energy-efficient equipment can improve your indoor air quality and save you money over time. Installation may even qualify you for rebates and tax incentives.
