If you turn your heat on, and your furnace does not start, there are a few reasons that this could be happening. If for some reason the blower did not start, the temperature in the heat exchanger could rise to an unsafe level and potentially be a fire hazard. This is typically caused by one of three factors: when it’s below 35° outside, you’re trying to heat your home by 3° or more, or your heat pump is in defrost mode. A furnace not kicking on is one of the most alarming things of the winter. If you're not sure what that looks like you can tell me and I'll post a photo for you. Simply draining the pan isn’t a viable solution (but could work temporarily) because it doesn’t fix the issues causing this. If it won’t kick on check for a blown circuit breaker and look to see that any associated wires haven’t been chewed through by rodents or become corroded. If your furnace is not keeping your house at the temperature to which you set it, then you have a problem somewhere in your heating system. It’s not a fun situation to turn on your furnace during a cold day or night only to have nothing happen. If it’s still not on, set the thermostat to 90 degrees Fahrenheit. I have addressed them below and suggest a few things you can try to fix the problem. HVAC Technician. Small flathead screwdriver. One of those settings is the control for the fan, the default setting is for the ecobee to control the fan for energy efficiency. "Heat" "Heat On" Fire Icon; Sun Icon . This can be caused by a stuck or fault sail switch, or because the fan is turning to slowly to push the sail. Your furnace will not turn on if your air filter is clogged. Set the temperature you would like – for test purposes, just set about 10 degrees hotter than the … Red blinking light Brand new. The valve should be either all the way on or all the way off (this is one reason why many manufacturers have switched to switches and buttons). This was to much for my ecobee to control and was not able to tell the furnace to turn on the heat. Discovered when pulling Y1 (AC) wire furnace behaves normal. But the furnace will still need to be repaired before you can enjoy heat from it. It's the most likely reason your heat won't turn on. Aux heat should only kick on when the heat pump can’t produce enough heat to warm your home on its own. 1. A dirty filter will also cause soot to build up in the heat exchanger, causing your furnace to run inefficiently and reduce it’s life span. Electric or gas, the furnace still needs power to operate. Heat Pumps and Heat Pump Balance Point. Having them go out is quite a common occurrence that can be remedied with the strike of a match. Then, turn the gas valve to the off position and wait five minutes. If not in the on position, pop the breakers back into place carefully. Problem: Heater is blowing cold air Those occurrences include: There should be an inspection window on your furnace, but that does little if you don’t know what to look for. The first set turns on the blower and the second protects you from the fire hazard. Check that the thermostat has power to it if your furnace won't turn on. If you notice any burn marks on the control board of the heating system, there may have been an electrical short. Here’s what to check first. If your furnace overheats, this sensor will trip, causing the heat to turn off. I had the cover off to get the model number off the furnace and it kicked on while I was looking inside. YES – Continue to the next step. When your furnace is cycling on and off, it's called furnace short cycling. If it does not, there could be a problem with the assembly or the sensor, and a professional would need to come in and fix it. Having a hard time getting your furnace to kick on? Sometimes it comes on by itself, other times I have to go downstairs and bang the top of the furnace to get it to kick on. When it is not functioning properly, it can cause your furnace to cycle on and off more frequently than is necessary. The issue may be with the furnace itself, but it also may come from a number of other sources. Before you spend money on repair professionals, try to diagnose the problem yourself so that you have a better idea of what kind of help you need. No Power. Most models have an inspection window. You press the thermostat up a couple more times and nothing. Is your furnace not working or perhaps the furnace is turning on but only for a few seconds? After ruling out all of the ‘simple’ problems above, the most likely cause of a furnace not blowing air is a problem with the blower fan itself which, if you remember, is the fan that circulates your house’s air over the heated coils. In order to activate your furnace, your thermostat needs to be set to a temperature above your current room temp. Changing air filters takes less than a minute, and doing so regularly can save hundreds of dollars over the life of the furnace. 1. Most furnaces also have a reset button that clears any issues that might cause the furnace to produce no heat. The pilot and gas burners start, but the fan does not. Your thermostat is responsible for telling your furnace when to turn on and off. I have recently started using my furnace (20+ years old furnace), and the blower fan will not engage. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. There are other technical issues that could be leaving your furnace in the dormant phase. Pinpointing Why the Furnace is Humming. There is a condensation pan on the furnace that collects excess water and if the reservoir is full the furnace won’t turn on. If there is a problem with the furnace's blower component, your furnace will not kick on. Furnace shuts down– Because your furnace has to run longer to heat your home, the heat exchanger overheats, causing the furnace to automatically shut down. The furnace is overheating: All furnaces contain an internal temperature sensor that serves as a safety mechanism. The fan limit switch has 2 sets of contacts in it. Regardless of the type of fuel that you use to power your furnace, it needs electricity. If I turn the thermostat off and then back on it usually turns back on but what could be causing this? In addition to this, make sure that the thermostat is set to a temperature higher than the … Homeowners need to be vigilant in changing their filter up to once a month in the Winter to lower efficiency bills, make sure air quality is pure, and to keep the furnace functioning. Any ideas as to what part is beginning to fail? If the safety switch is open, the burners won’t turn on. 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