A furnace that won’t turn off usually needs to be repaired by a professional. Let’s look at the most common reasons why a furnace won’t turn off.

1. Faulty Thermostat

If a thermostat isn’t registering the correct temperature, it could think it is colder than it really is. If this happens, it won’t tell the heater to turn off when it needs to, and it will continue to run. It could also be as simple as the thermostat being set to the incorrect temperature. However, if you have verified that this is not the case, you should call in the experts from KHAN Air Conditioning, inc. to fix the issue.

2. Broken Blower Fan Motor

If the blower fan motor for your HVAC system is broken, it won’t pull air into the system or push air out. This results in heated air not being circulated in your home. The furnace will keep running because it can’t reach the temperature you have set on the thermostat.

3. Damaged Ductwork

Ductwork that is damaged will have holes and cracks through which hot air will leak. If the damage is significant enough, the warm air won’t reach the interior of your home. This results in an inability to reach your set temperature, which causes the heater to keep running. Holes and cracks in your ductwork also allow pests and contaminants such as dust in, and this results in poor indoor air quality.

4. Dirty Air Filters

A dirty air filter makes it so that air cannot pass through it efficiently. This restricted air results in an inadequate amount of air being heated and dispersed throughout your home. Your furnace won’t be able to reach the temperature set on your thermostat and will therefore keep running.

You should check the status of your HVAC filter monthly and change it as necessary. The average rule of thumb is to replace the air filter for your HVAC system at a minimum of every three months. If you have pets, you will likely need to replace your filter on a monthly basis.

We serve Northridge, CA, and the surrounding area. You can count on us for all your heating and cooling maintenance, repair, and installation needs. We also offer maintenance agreements and indoor air quality services. Call us today to learn more about our services and to schedule an appointment.

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