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When your furnace malfunctions, repairing it as quickly as possible can be critical to preserving interior warmth. The problem, of course, is how to identify what’s wrong and how to fix it. Below, we list some common furnace problems, their signs, and how to resolve them, including when you should call professional heating contractors instead of handling the job on your own.

Six Problems That Need a Fast Furnace Repair

1. Thermostat Malfunction

If you have to set your thermostat higher than the desired temperature in order to achieve it, there are two quick fixes that might solve the problem: ensuring that your thermostat isn’t filled with dust and debris that could affect its sensitivity, and ensuring that it isn’t exposed to a direct source of heat that the rest of the room isn’t. If neither of these fixes is applicable, calling a fast furnace repair service should get the problem repaired at minimal cost.

2. Tripped Circuit Breaker

If your furnace suddenly kicks off, it could be due to a tripped switch in your switch box; a panel of switches that controls the electricity in your house and is usually located in a utility area of a basement or garage. If you see one switch that’s switched in the opposite direction of the others, push it in the other direction and see if your furnace power resumes.

3. Leaky Ductwork

Leaky ductwork can also lead to setting a thermostat higher than the desired temperature in order to achieve it. This happens because leaks in ductwork let air escape into areas where it isn’t needed, such as ceilings and walls. Resealing your ducts is a job best left to the professionals, and one that should be done as quickly as possibly to keep your electricity bill from soaring out of control.

4. Extinguished Pilot Light

If you have a gas furnace, it won’t work unless the pilot light is lit. The pilot light should be easily visible near the bottom of your furnace from a crawling position. If you look at the underside of your furnace and see no flame, chances are that an extinguished pilot light is the source of your problem. A pilot light can be easily relit using fireplace matches or a gas grill lighter.

5. A Blower that Runs Continuously

A blower that runs continuously is usually the result of a stuck limit switch, an apparatus located on a furnace’s plenum, a box that distributes heated air to ducts. If your blower won’t stop running and the limit switch is in the on position, switch it to the auto position or the off position. If it’s already in one of these positions, call a heating service to have the switch adjusted.

6. Clogged Air Filter

Whether you have American Standard heating or another type of heating, a badly clogged air filter can lessen the force of air that reaches your rooms. In modern furnaces, air filters are typically located behind a slim metal panel that contains an air filter indicator near its surface. Regularly replacing your air filter will also lessen the load on your furnace and cut down on dust in your home.