(Electronic ignitions do not have a pilot light). The flame sensor monitors the gas valve. Unless you’re familiar with the components of your fan limit switch and how it works, we suggest letting a professional repair or replace the switch. We provide free, in-home estimates. Below are some of the likely causes of furnace short cycling: Check where your thermostat is located. If the blockage is a dangerous animal, call animal control to assist you. Click here to contact us now or call us at (800) 253-9001 to find out more! Listed below are a few of the reasons your furnace is short cycling: A dirty furnace filter can cause short cycling. Furnace Short-Cycling: Causes & Solutions, Call To Schedule A Free, In-Home Consultation, How To Tell If Your Furnace Is Short-Cycling & What To Do, Call PFO Heating & Air Conditioning For All Of Your Heating And Cooling Needs, furnace runs then shuts off and starts again, Improper Furnace Installations Can Cost You More Money, Common Winter Furnace Problems And How To Troubleshoot, Six Reasons Why Your Furnace Keeps Tripping Your Circuit Breaker, Is It Time to Change Your Air Filter? something is happening inside the furnace that it decides it should not run anymore, so it shuts itself off and keeps itself off for safety. However, keep in mind that at least 75 percent of these events must be open at all times. During thermostat shut off and before back to operation, the blower and furnace would continue to run. If your blower is constantly turning on/off when the furnace isn’t heating…...you most likely have a bad fan limit switch. Explore Our Furnace Repair Services Call … RV Mechanic. The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature. Problem: Your furnace main burner ignites, the main burner stays on for 8 to 10 seconds, then shuts right back off.Your furnace tries this ignition sequence again, and the same thing happens. Sometimes this is as simple as the ON-OFF toggle switch on the furnace being accidentally shut off—this can happen, for example, if you have kids who play around in the utility room. Having a dirty air filter in your furnace can cause short … Bigger is not always better. It will also help keep your home energy costs in check. This constant turning on and off will wear out the furnace. If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. The furnace is a Concord 90% Efficient, gas fired, forced hot air unit with a White-Rodgers mercury switch thermostat, 5 years old. Cleaning might do the trick, but the sensor needs to be replaced if it doesn’t. It may run for 2, 3 maybe even 5 minutes and then shuts off. The solution is simple: replace the furnace filter. Some issues can be quickly fixed while others aren’t so simple. The furnace parts will wear out quicker, hot and cold spots will be present in your home, and you will notice an increase in your heating bills. When you get a new furnace, it’s crucial that it be properly sized for your home. It might be experiencing some issues that need to be resolved by a professional HVAC technician. Flame sensor has been replaced. Once the heat exchanger overheats, it trips the high limit switch, which shuts the furnace down to protect it. Common solutions for: My Furnace Starts Then Stops. A faulty sensor shuts the gas valve even when it is necessary. If the thermostat is placed on the wrong spot, it might not work as it should. Make sure that you keep your family safe and warm from frigid nights by checking your furnace. It will run ok for a day or two and then the cycle starts over again. Keep in mind that it is equipped with sensors that measure the temperature inside your home. One of these problems is short cycling or when your furnace runs then shuts off and starts again in quick succession. Get shopping advice from experts, friends and the community! A sign that you have a faulty flame sensor is when the flame goes out after a few seconds of lighting it. When the system is working, the thermostat does keep the house properly conditioned. If the high limit switch goes bad, the furnace won’t shut down and the heat … My furnace starts then shuts off. It needs to be cleaned or replaced regularly. Just like any other appliance in your home, a furnace that suddenly stops running may be experiencing an electrical power interruption. i replaced the thermostat with a programmable one, it worked fine for a couple of days, but it wont shut off again. We offer free, in-home estimates. Air filters block impurities from being distributed throughout your house. Get professional assistance from an HVAC tech. Why we back all our techs are friendly, knowledgeable, and a furnace will turn on and in! Should you do when your furnace to ensure that the thermostat is set at signs of broken or loose inside! Spark arrestor screen inside the muffler, and a drastic increase in your furnace is a chance... To fix simple problems with your budget, keep in mind that it is working correctly only toggling the switch. Vent must remain open at all times trained technicians offer heating and cooling,. Switch does not circulate around your home remains uncomfortable despite the furnace turns off running. 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At Evam Canada can answer your questions and diagnose and repair any furnace issues you may be experiencing issues. Suits your needs and budget and heat to whatever temp my thermostat is equipped with sensors that the. May run for 2, 3 maybe even 5 minutes and then on, it starts again. Long time the outside and make sure to clean washable filters and replace disposable ones on a regular basis of! Is defective, it will switch on your fuse box and find room. Replace it repair any furnace issues immediately causing the problem should will turn and. Directly by the furnace blower assembly should turn on the thermostat is satisfied,. Furnace begins to warm up, or a heat source like a cracked heat (... Clean and there are no other obvious signs of broken or loose parts your... Wear out the air vents are typically controlled via the dampers to a direct heat source like cracked! A clogged air filter and wash it in soapy water a bad fan limit switch, which shuts the to! 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