Furnace Turns on for a Cycle and Than After an Hour It Turns on Again

Have y'all ever thought "Why does my furnace go along shutting off?" You are not solitary. This is a very common problem that if not diagnosed and corrected immediately could result in higher utility bills and major furnace repairs. Or fifty-fifty a furnace replacement if information technology's left for too long.

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

1 - Low airflow

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

• Dirty Air Filters. If you don't change your air filters often enough, the filters will become muddy and chock-full, which means the rut exchanger retains heat and eventually causes it to overheat. It'southward imperative you alter your air filters about every ninety days unless you take pets or allergies. If yous have pets or allergies, you should exist irresolute air filters every 60 days, or less if your allergies are severe.
• Dirty Blower Wheel. If your furnace goes on and off too rapidly, it could be a dirty blower wheel. The blower wheel has blades that push the air and if information technology has dirt on it, it won't work every bit efficiently and might ultimately not work at all. You lot can forbid dirt from edifice up on your blower wheel by changing your air filters regularly. If you lot don't, this could stop up being expensive to repair.
• Closed or Blocked Air Supply Vents. If your furnace keeps shutting off, bank check your air vents to come across if any of them are airtight or blocked in whatever way. You lot should keep all your vents open, fifty-fifty in the rooms you don't use. If your heat exchanger doesn't get enough air, information technology can't transfer enough heat. Then that rut builds upwards and could stop up causing your furnace to short bike.

ii - Faulty thermostat

Your thermostat is what controls your unabridged heating organisation. And then, if your furnace keeps turning off and on too apace, your thermostat might exist malfunctioning or broken. There are several things that could be causing your thermostat to not work properly. The wiring could exist quondam and need replacing, it might need new batteries, or it could exist the location of your thermostat.

If your thermostat is placed shut to a heat source such as direct sunlight or a rut register, information technology will skew the temperature reading causing the thermostat to turn on and off irregularly. Unless your thermostat just needs batteries, y'all volition need to contact a professional to either replace any one-time wiring or relocate your thermostat to a more appropriate location.

3 - Flame sensor

If your furnace shuts off likewise frequently, you could take a corroded or dirty flame sensor. A flame sensor lets your system know at that place'south a flame when the gas valve is open up. If in that location isn't a flame, the sensor will shut off the gas valve to proceed the gas from getting into your business firm. If the flame sensor is dirty or has become corroded, the flame won't register and will plow off the gas valve, which, in turn, causes your system to shut down. You lot will need to contact a professional person to check this, especially if your furnace is cycling on and off besides quickly.

Other possible causes of a short cycling furnace.

If your furnace is curt cycling, it could too be any one of the following problems:

Blower motor

The blower motor is what circulates the air throughout your house. It's possible your furnace will run when the blower motor is off; however, that'due south rare. Just on the rare occurrence information technology does, in that location wouldn't exist any air blowing over the heat exchangers which would cause your furnace to get off. The best way to bank check this is to hold your hand upward almost the vents to see if there is any air coming out. If there is no airflow or the airflow is weak, the blower motor is likely the trouble.

Flue pipe

The flue piping, as well known as the exhaust vent, is located on your roof and tin can besides cause your furnace to curt cycle. This happens when dirt, leaves, sticks, or other droppings like a bird or animal nest ends upward inside the pipe resulting in a blockage. This blockage will cause hot gases to build up in your furnace causing it to overheat. One of your furnace's safety features includes a mechanism that will trigger your furnace to shut down if it gets overheated.

Over-sized furnace

If your furnace is too big for your home, it could cause it to short cycle. Unfortunately, in this instance, yous will have no other choice but to supplant your furnace if you lot want to right the issue. What happens when your furnace is too large for your home is it will rut your house also quickly then abruptly plow off. Then in one case your home starts to go cold again the cycle is repeated.

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

A furnace cycling on and off also quickly isn't something that should be ignored. As soon as you realize there's a trouble, contact a professional HVAC contractor to inspect your arrangement. If you lot don't, you could exist looking at major repairs or quite possibly the replacement of your unabridged arrangement. Another great way to avoid expensive repairs or a replacement is by performing regular preventive maintenance and scheduling a tune upward at least once a yr.

If you would like more information nigh a short cycling furnace, or to talk with someone about scheduling a service call, please contact Petro Home Services today. You can rely on our team of experts to exercise everything to keep your heating system upwards and running efficiently and effectively all year round.

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