If your blower is constantly turning on/off when the furnace isn’t heating… …you most likely have a bad fan limit switch. Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off.
Why does my furnace blower keep running?
If your fan limit switch is set to AUTO but the fan continues to run without ever stopping, you’ll need to call a professional. Two problems that could cause your fan to run without stopping include: A bad fan limit switch that needs to be replaced. Bad thermostat wiring.
Why would a blower of a furnace turn on with out furnace running?
Quote from Youtube video: Reason number one is that an electrical safety switch has tripped due to a problem you could have switches like this or you could have ones like these right here.
Why does my blower fan keep running?
Faulty Thermostat: If both the fan and either the cooling or heating system are running unexpectedly, you may have a faulty thermostat. Broken Relay Switch or Short Circuit: If only the fan is running, there may be a broken relay switch preventing the settings you enter on the thermostat from being sent to the fan.
How do you reset a furnace blower?
Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
What can cause the blower to come back on for a short time after cycling off?
Check for a dirty air filter and replace if needed.
A clogged filter limits the amount of cool air that passes over the heat exchanger, causing it to overheat and shut off. At the same time, your blower turns on to help cool it down.
Why does my furnace keep turning on and off and blowing cold air?
If your furnace is blowing cold air in your home, this is a sign of an issue with the flame detector, gas supply, air filter, pilot light, or condensate lines. Many of these issues are able to be easily solved on your own by sanitizing or replacing components in the gas furnace.
Should I hit the reset button on my furnace?
The purpose of the reset button on a furnace is to shut it down before it can trip your circuit breaker. The need for this may arise if the furnace becomes too hot, or if there is some sort of electrical system interruption. To get the furnace working again, you simply press the reset button back down again.
How do I know if my blower motor is bad on furnace?
What Are Signs Your Blower Motor Needs to Be Replaced?
- Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
- No Airflow At All From Vents. …
- Skyrocketing Energy Bills. …
- Strange Noises When You Turn on the Heat. …
- Overheating Blower / Weird Smells.
Does a furnace have a reset button?
All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.
How do I stop my furnace from short cycling?
Quote from the video:
Quote from Youtube video: So to fix this issue shut off your thermostat. And open up the furnace. And then replace the batteries on the thermostat.
Why is my furnace blower short cycling?
Clogged Air Filter
One of the most common causes of short cycling is restricted air flow. You’ve probably already checked your filter and changed it if it was dirty. But if not, now is the time to do it. When the filter is filthy, fresh air cannot get into the furnace, causing it to overheat and shut down.
Why does my furnace turn on and off every few minutes?
So, if your furnace keeps turning off and on too quickly, your thermostat might be malfunctioning or broken. There are several things that could be causing your thermostat to not work properly. The wiring could be old and need replacing, it might need new batteries, or it could be the location of your thermostat.
Is it normal for furnace to cycle every 5 minutes?
On average, furnaces should kick on and turn off anywhere from three to eight times per hour. However, if your furnace turns on and off more frequently, don’t assume the furnace is short cycling just yet.
How do you know a thermostat is bad?
7 Ways to Tell Your Thermostat Is Broken
- Thermostat Has No Power. …
- AC or Furnace Won’t Turn On. …
- Heater or AC Won’t Turn Off. …
- Thermostat Doesn’t Match Room Temperature. …
- Thermostat Doesn’t Respond. …
- Short Cycling. …
- Thermostat Forgets Programmed Settings. …
- Thermostat Replacement Services.
How often should your furnace fan run?
While there’s no set standard, the average can be between 3-8 times an hour. The question might not come with any “hard and fast” answers, as each home and its residents may have different requirements. A bigger home may need to run the furnace longer.
Should your furnace fan be on auto or on?
“auto” is the best setting for your furnace fan in the winter. It will aid in saving energy and money while also working to keep your home at an optimal temperature. However, for summer, “on” is the best setting for your furnace fan.
Is it OK to run furnace fan constantly?
Improve Air Quality
By running the furnace fan all the time, you are also running air through your furnace filter constantly. If you have an efficient filter and a UV light, you are constantly filtering and cleaning the air. This results in healthier indoor air quality for your family and less dust on your furniture.
