There is a wide range of symptoms that indicate that your furnace may need repairs. There are some signs, however, that indicate something a bit more serious. If you notice any of these behaviors when you turn on your furnace, you may need to get your furnace replaced.
Short-cycling is what happens when your furnace turns on and off constantly. This will cause the system to enact safety measures, which will shut down the furnace. After a short time, the furnace will restart and the cycle will continue perpetually. There are two possible causes for this. The first is that your furnace is too large for your home. The furnace itself may operate as it was intended to do, but the increase in heat output will cause the system to lock it into short-cycling.
The second possibility is that something is preventing your furnace from venting properly. This could be a problem with the air filter, heat exchanger, or several other areas that are necessary for the furnace itself to maintain the proper temperature. This can be quite serious, and is a definite sign that you need your furnace replaced.
Needing repairs every once in a while isn’t a big deal. All heating systems will eventually have problems that need fixing. When a heating system starts needing repairs every couple of months, however, you should pay attention. Needing frequent repairs is usually a sign of extreme wear and tear on the system as a whole. This is usually caused by simple age and repeated use. If your furnace suddenly seems like it needs more and more professional attention, especially if it’s an older unit, it’s probably time to start looking for a replacement.
All unusual behavior should be checked by a professional for accurate diagnosis. If you suspect that your furnace might need replacing, don’t go out and buy a new one right away. Call an HVAC technician to confirm first.