Many of them are brightly colored for easy identification.Īlthough the gas valve is often open, you may find it in an OFF position for several reasons. Other valves also look like little boxes, while others resemble a lever and can vary in size, though they’re usually about the size of the little finger. However, they characteristically have a little disk with a small handle or lever. Gas furnaces typically have a valve or gas cock located within six feet of the unit. To prevent this, make sure to check that gas is turned ON. It’s also possible to blame your furnace when you haven’t turned ON the gas supply. Otherwise, you’ll find yourself stuck in the cold and even think your furnace has a malfunction when it hasn’t. For instance, if the furnace typically comes on at 70☏, you must set the thermostat to 70☏. Also, double-check manual thermostats can be easily knocked to an OFF position during standard house cleaning.įinally, ensure the temperature setting is one that typically causes the furnace to come on. This is very important as many furnaces also have a “FAN” mode. If you have a programmable thermostat, verify that the display is active and the unit is set to heat. Therefore, check to ensure that it’s plugged in and turned ON. The same applies if the thermostat is plugged in but not turned on. If the thermostat isn’t getting power from your home’s electric supply, it cannot run. However, most people forget that the thermostat must be powered and switched on to function. The thermostat is typically placed on one of the main walls in the home around, around the same height as the light switch. The first place to check when you realize that your furnace won’t run with the thermostat in place is the thermostat itself – and the first thing to check is the thermostat switch. Reasons Your Furnace Will Not Turn on with Thermostat 1. Unfortunately, there are several potential reasons. Why then would the thermostat refuse to run? Indeed, most furnaces will not run even if the thermostat is in place but positioned or set incorrectly.īut what if the thermostat is present and working. Thus, if the thermostat is damaged, the unit won’t run. Without a “Start” signal from the thermostat, it wouldn’t run. Why? Because the furnace only gets “Start” and “Stop” signals from the thermostat. It will be understandable if the thermostat is disconnected as most furnaces are designed to only run with the thermostat in place and functioning. Why would a furnace refuse to run with the thermostat connected? One of the most common furnace issues that you should troubleshoot and perhaps fix is a heater that will run with the thermostat on. This way, you can restore heating function if the furnace goes off in the middle of the night. Therefore, every homeowner must prep their furnace for the winter and, more importantly, be prepared to handle common malfunctions. For instance, it can cause frozen pipes, leading to costly water damages.Ĭold temperatures resulting from a broken furnace can also cause structural damage, leading to cracked walls and foundation shifting. Apart from causing the discomfort of a cold house, it can lead to costly damages. A malfunctioned furnace can spell doom for your family.
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