Furnace Turns on Then Off Then on Again

Have you ever idea "Why does my furnace proceed shutting off?" You lot are not alone. This is a very common problem that if not diagnosed and corrected immediately could issue in higher utility bills and major furnace repairs. Or even a furnace replacement if it's left for likewise long.

When your furnace is cycling on and off, it's called furnace short cycling. Beneath we become over some of the more common causes why this might exist happening.

ane - Low airflow

If your furnace keeps shutting off, it could be due to low airflow. In that location are several indirect issues that crusade low airflow.

• Dirty Air Filters. If you don't alter your air filters often enough, the filters will become dirty and clogged, which ways the estrus exchanger retains heat and eventually causes it to overheat. Information technology'due south imperative you modify your air filters nigh every 90 days unless y'all accept pets or allergies. If you lot have pets or allergies, you lot should be changing air filters every threescore days, or less if your allergies are severe.
• Dirty Blower Wheel. If your furnace goes on and off too quickly, it could exist a dirty blower wheel. The blower cycle has blades that push the air and if it has clay on information technology, it won't piece of work as efficiently and might ultimately not work at all. You lot can foreclose dirt from edifice up on your blower wheel by irresolute your air filters regularly. If you don't, this could end upwards existence expensive to repair.
• Closed or Blocked Air Supply Vents. If your furnace keeps shutting off, check your air vents to run across if any of them are closed or blocked in whatever way. You should keep all your vents open, fifty-fifty in the rooms you lot don't employ. If your heat exchanger doesn't get plenty air, it tin't transfer enough estrus. Then that estrus builds up and could end up causing your furnace to curt bike.

two - Faulty thermostat

Your thermostat is what controls your entire heating arrangement. And so, if your furnace keeps turning off and on also quickly, your thermostat might be malfunctioning or cleaved. There are several things that could be causing your thermostat to not work properly. The wiring could be quondam and need replacing, it might need new batteries, or it could be the location of your thermostat.

If your thermostat is placed close to a heat source such as directly sunlight or a estrus annals, information technology will skew the temperature reading causing the thermostat to turn on and off irregularly. Unless your thermostat just needs batteries, you will need to contact a professional to either replace whatever one-time wiring or relocate your thermostat to a more appropriate location.

3 - Flame sensor

If your furnace shuts off too often, you could have a corroded or dingy flame sensor. A flame sensor lets your organisation know there's a flame when the gas valve is open. If at that place isn't a flame, the sensor will shut off the gas valve to keep the gas from getting into your business firm. If the flame sensor is muddied or has become corroded, the flame won't register and will plough off the gas valve, which, in turn, causes your organisation to shut downwards. You lot volition need to contact a professional person to check this, peculiarly if your furnace is cycling on and off as well rapidly.

Other possible causes of a short cycling furnace.

If your furnace is short cycling, information technology could likewise be whatever i of the following problems:

Blower motor

The blower motor is what circulates the air throughout your firm. It's possible your furnace will run when the blower motor is off; all the same, that's rare. Just on the rare occurrence it does, there wouldn't be any air bravado over the oestrus exchangers which would cause your furnace to go off. The best style to cheque this is to hold your mitt upwardly nearly the vents to come across if there is any air coming out. If there is no airflow or the airflow is weak, the blower motor is likely the problem.

Flue piping

The flue pipage, besides known equally the exhaust vent, is located on your roof and can also cause your furnace to short cycle. This happens when dirt, leaves, sticks, or other droppings similar a bird or animal nest ends up inside the pipe resulting in a blockage. This blockage volition cause hot gases to build up in your furnace causing it to overheat. One of your furnace'due south safety features includes a mechanism that will trigger your furnace to shut down if it gets overheated.

Over-sized furnace

If your furnace is also big for your home, it could cause it to short wheel. Unfortunately, in this example, you will accept no other choice but to supercede your furnace if y'all want to correct the event. What happens when your furnace is too big for your home is information technology will rut your house likewise quickly then abruptly plough off. Then once your habitation starts to go common cold once again the wheel is repeated.

If you just had your furnace installed and it's already brusk cycling, the technician probably didn't perform a Manual J Rut Load to determine the proper size furnace for your home.

A furnace cycling on and off as well apace isn't something that should be ignored. As before long as y'all realize there'due south a problem, contact a professional HVAC contractor to inspect your arrangement. If y'all don't, you could be looking at major repairs or quite possibly the replacement of your entire organization. Another great way to avoid expensive repairs or a replacement is past performing regular preventive maintenance and scheduling a tune up at to the lowest degree once a year.

If you would like more than data most a brusque cycling furnace, or to talk with someone virtually scheduling a service call, please contact Petro Dwelling house Services today. You can rely on our team of experts to do everything to keep your heating system up and running efficiently and finer all twelvemonth circular.

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Source: https://www.petro.com/resource-center/furnace-cycles-on-off-frequently#:~:text=So%2C%20if%20your%20furnace%20keeps,the%20location%20of%20your%20thermostat.

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