![]() ![]() All that dust and dirt builds up, and eventually, not even air can pass through it.Īt that point, your furnace generates heat but has no air pressure to force it out into the ductwork. If you leave your air filter in for too long, it gets clogged. When that happens, you’ll likely have no choice but to replace the entire system. A furnace that keeps turning on and off can end up with a cracked heat exchanger. No matter the cause for short-cycling, you need to get it addressed as soon as possible. Heaters turn on and off (short-cycle) when hot air backs up into them. Four Reasons Your Heater Turns On And Off (And What To Do) Meanwhile, your house isn’t warm! So, the thermostat sends another signal to turn on the heat. It will often send a blast of cold air to cool down any components getting too hot. That’s why it only runs for a few minutes at a time. When hot air backs up, the heater shuts off as a failsafe. When that happens, you end up with a lot of damage. Here’s the problem: Furnaces heat the air inside them and then push it out. That’s especially the case if you notice a blast of cold air coming through your vents right after the heat switches off. So, a short cycle usually means the warm air can’t circulate properly. Most forced-air systems go through this cycle three or four times per hour. Short cycling is when your heater turns on and off every few minutes. What Does It Mean When A Heater Short-Cycles?
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