5 Reasons Why Your Heating Unit is Failing to Turn Off
                     5 Reasons Why Your Heating Unit is Failing to Turn
Off
You may need to use your heating unit throughout the winter. However, it doesn’t mean 
that your heating unit will run continuously. It’ll turn off as soon as it reaches the pre-set 
temperature. However, if your heating system isn’t turning off even after reaching the 
set temperature, it’s probably because of the following reasons.
5 Reasons Why Your Heating Unit is 
Running Continuously
1.   Faulty Thermostat
Thermostat is considered the brain of a heating system. It sends a signal to the heating 
unit to turn on or off. When you have a malfunctioning furnace thermostat, it’ll send 
wrong signals to the system, and the heating unit will operate continuously. In this case,
you’ll have to call heating professionals and check the thermostat.
Again, if someone has changed the thermostat settings, your furnace or heating system 
will run continuously. For example, if the thermostat fan setting is set to “On,” the blower
of the heating unit will run continuously, despite reaching the desired temperature. To 
solve this issue, you’ll have to set the thermostat fan settings to “Auto,” and the blower 
will run when you turn on your heating unit.
Pro-Tip
When the outside temperature drops very low, it becomes difficult for the heating unit to 
maintain a high temperature. Besides, in that extreme cold condition, if you set the 
temperature high, your heating system will have more wear and tear. In this case, try 
lowering the furnace temperature a bit. It’ll save you money on energy bills and reduce 
furnace wear and tear.
2.   Clogged Heating Air Filter
Air filter keeps the indoor air clean by blocking dust and microparticles. However, it gets 
clogged quickly as it blocks or captures these particles.  And when you have a clogged 
air filter in your heating unit, it’ll block the airflow and your furnace will operate 
continuously. That’s why it is required to be replaced every 70 to 80 days.
3.   Damaged Furnace Blower Motor
The blower motor circulates hot air throughout your house. But when you have a 
malfunctioning blower motor, it’ll fail to circulate warm air in your space. And when this 
happens, your furnace thermostat will send signals to the unit to function continuously.
But how do you know whether your furnace blower motor is working or not? It’s easy – if
you notice that you’re feeling cold even after turning on your heating system, there is a 
high probability that it’s a problem with the blower motor.
As soon as you find out that the blower motor isn’t working, you must repair it. However,
you should avoid DIY methods while repairing the blower motor. Because the blower 
motor has some sophisticated mechanical and electrical component that needs to be 
handled by only professionals.
4.   Wrong Size Heating Unit
When you have the wrong size heating unit, it’ll run continuously and increase the 
heating bills. For example, if the heating unit is undersized, it won’t be able to keep with 
the space’s heating demands. As a result, your furnace or heat pump will have to 
operate longer to reach the set temperature. Again, when the furnace is oversized, 
you’ll have a short-cycling problem, and your heating unit will never turn off.
To overcome this issue, you’ll have to contact a professional and determine the right-
sized heating unit. While selecting the heating unit size, you’ll have to consider the 
insulation of your space, number of windows, occupants, climate, and space size.
5.   Damaged Air Ducts
If there are leaks in the air ducts, produced hot air will leak through the holes and this 
will make the heating unit run continuously. If you notice unevenness in the rooms’ 
temperature, there is a high probability of leaks in the air ducts.
When you find out that there are leaks in the air ducts, you should call an air duct 
professional and repair the air ducts. However, if the air ducts are heavily damaged, you
must replace the ductwork.
Conclusion
If the heating system problem isn’t solved yet, you could have a faulty control board. To 
check this, you should call a professional and repair it. If you live in Dallas, call Green 
Leaf Air. We provide all sorts of HVAC services 24/7 across Dallas and surrounding 
areas.
See the summary of this content here in an infographic – 5 Reasons Why Your Heating 
Unit is Running Continuously [Infographic]
5 Reasons Why Your Heating Unit is 
Failing to Turn Off
Sources:https://greenleafair.com/5-reasons-why-your-heating-unit-is-failing-to-
turn-off/