Furnace Runs Then Shuts Off and Tries to Start Over and Over Again

Accept you ever thought "Why does my furnace keep shutting off?" Yous are not alone. This is a very mutual problem that if not diagnosed and corrected immediately could result in higher utility bills and major furnace repairs. Or even a furnace replacement if it'southward left for too long.

When your furnace is cycling on and off, it's called furnace short cycling. Below we go over some of the more than common causes why this might be happening.

1 - Low airflow

If your furnace keeps shutting off, information technology could be due to low airflow. There are several indirect issues that cause low airflow.

• Dirty Air Filters. If you lot don't change your air filters frequently enough, the filters will become muddied and clogged, which ways the heat exchanger retains rut and eventually causes it to overheat. Information technology's imperative yous modify your air filters near every xc days unless you take pets or allergies. If you have pets or allergies, you should be changing air filters every sixty days, or less if your allergies are astringent.
• Muddied Blower Bike. If your furnace goes on and off as well speedily, information technology could be a dirty blower wheel. The blower wheel has blades that button the air and if it has dirt on information technology, it won't work as efficiently and might ultimately not work at all. Y'all can foreclose dirt from building upward on your blower cycle past changing your air filters regularly. If you don't, this could finish upwardly being expensive to repair.
• Closed or Blocked Air Supply Vents. If your furnace keeps shutting off, bank check your air vents to see if any of them are closed or blocked in any way. Yous should keep all your vents open, fifty-fifty in the rooms yous don't utilize. If your heat exchanger doesn't go plenty air, it can't transfer enough heat. Then that rut builds up and could finish upwards causing your furnace to short cycle.

2 - Faulty thermostat

Your thermostat is what controls your entire heating organisation. So, if your furnace keeps turning off and on besides chop-chop, your thermostat might be malfunctioning or broken. At that place are several things that could be causing your thermostat to non work properly. The wiring could exist onetime and need replacing, it might need new batteries, or information technology could exist the location of your thermostat.

If your thermostat is placed close to a rut source such equally direct sunlight or a heat register, 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 person to either replace any old wiring or relocate your thermostat to a more advisable location.

three - Flame sensor

If your furnace shuts off too ofttimes, you lot could accept a corroded or muddied flame sensor. A flame sensor lets your system know there's a flame when the gas valve is open. If there isn't a flame, the sensor will close off the gas valve to keep the gas from getting into your house. If the flame sensor is dirty or has become corroded, the flame won't annals and volition plow off the gas valve, which, in plow, causes your organisation to shut downwardly. Yous will need to contact a professional person to check this, especially if your furnace is cycling on and off too chop-chop.

Other possible causes of a curt cycling furnace.

If your furnace is short cycling, it could as well be any i of the following problems:

Blower motor

The blower motor is what circulates the air throughout your house. It'due south possible your furnace will run when the blower motor is off; however, that'south rare. Only on the rare occurrence information technology does, at that place wouldn't be whatever air bravado over the oestrus exchangers which would cause your furnace to go off. The all-time way to cheque this is to hold your hand up near the vents to see if there is any air coming out. If in that location is no airflow or the airflow is weak, the blower motor is probable the problem.

Flue pipage

The flue piping, too known equally the frazzle vent, is located on your roof and can also cause your furnace to brusque wheel. This happens when clay, leaves, sticks, or other debris like a bird or animate being nest ends up inside the pipe resulting in a blockage. This blockage will cause hot gases to build up in your furnace causing it to overheat. I of your furnace's prophylactic features includes a mechanism that will trigger your furnace to shut down if it gets overheated.

Over-sized furnace

If your furnace is besides big for your domicile, it could cause it to curt bike. Unfortunately, in this case, you volition take no other choice merely to supplant your furnace if you want to correct the event. What happens when your furnace is too big for your home is it volition heat your business firm as well quickly then abruptly plow off. And so once your home starts to become cold once again the cycle is repeated.

If y'all simply had your furnace installed and it's already short cycling, the technician probably didn't perform a Manual J Oestrus Load to determine the proper size furnace for your domicile.

A furnace cycling on and off too quickly isn't something that should exist ignored. As soon as you lot realize there's a trouble, contact a professional person HVAC contractor to inspect your system. If yous don't, you could exist looking at major repairs or quite perhaps the replacement of your entire arrangement. Another great fashion to avoid expensive repairs or a replacement is by performing regular preventive maintenance and scheduling a tune up at to the lowest degree once a year.

If you lot would like more than data about a short cycling furnace, or to talk with someone about scheduling a service call, please contact Petro Home Services today. You tin rely on our team of experts to practice everything to keep your heating system upward and running efficiently and effectively all year circular.

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Source: https://www.petro.com/resource-center/furnace-cycles-on-off-frequently

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