So the aux engages as expected to get the head up to the setpoint (68). The upper radiator hose is hot and the lower radiator hose is cold. Have an expert inspect your ducts along with the furnace. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. Or the gas line isn’t supplying enough gas to your furnace. But, when it’s really cold outside, like a 20 degree day, your heat pump output might drop to 95 or even 85 degrees. One of the most common causes of cold air blowing is that your utility company has cut off the heat. You may have noticed a loud sound right before cold air blows out through the vents in your home. Try kicking it up a notch to see if there’s a noticeable difference. It is very cold here in the mid-west, and my system (geothermal heat pump) cannot keep up without engaging aux heat. Recommended Services. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. My car has a manual transmission. I am just wondering if I hooked something wrong hooking up the thermostat , or perhaps I have a problem with the heat pump and need to call someone out to fix the problem. If the fan limit switch malfunctions, the blower might continue to operate even when the furnace is not heating the air resulting in your furnace blowing cold air from your registers. A lack of heat can be a symptom of a much larger problem. Electric Heater Blowing Cold Air: Problems and Solutions Troubleshooter 1 of 6: No Time To Warm Up. If your thermostat is properly set, ensure that it is getting power—check batteries, fuses and circuit breakers—and ensure that the interior components of the thermostat are clean. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. This button controls an automatic shut-off feature that shuts down the furnace if it gets too hot or if there are other problems. Air in the cooling system impedes the circulation of coolant in the system, and as a result, the heater blows hot air only when driving, and cold air at idle. DON’T ignore this problem. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. Check the Pilot Light on Gas Furnaces. Is the fan set to run constantly, even when the system isn’t heating the air? If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. If it won’t stay lit, it’s time to call a professional. Basic filters are often inside the furnace cabinet, but larger, 4-inch media filters, electronic air cleaners, and whole-home air purifiers are likely mounted outside the furnace between the cabinet and the return air duct. At the end of the heating process, it waits until the internal air temperature drops below its predetermined level, then shuts down the fan until the next heating cycle begins. Problem: Heater is blowing cold air. Start by turning your heater off and inspecting the filters. Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. This helps to prevent natural gas (or propane) from continuing to flow into the home’s air supply. Show Less. 2. Well this could be caused by several things. 8 Common Problems With Conventional Gas Furnaces, Troubleshooting an Electronic Ignition Furnace That Won't Light, Troubleshooting an Intermittent Pilot Ignition System, How to Light the Standing Pilot Light on a Gas Furnace, How to Troubleshoot Electric Ignition Furnace Problems, How to Replace a Furnace Thermocouple or Electronic Flame Sensor, How to Check a Pilot Light on a Gas Furnace, Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler. Whether you are in the midst of a 110° heat wave or the arctic chill to end all arctic chills, you expect your HVAC vents to blast you with the desired dose of cold or hot air. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. Finally, reattach the sensor and restore power to the furnace. 11. Is it set for air conditioning instead of heating the air? Also, check the electrical switch at the furnace to make sure it is in the ON position. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. If you notice the air temperature in your home is cooler than normal... if the airflow from your heat vents seems to be weaker than usual... and/or if you hear the furnace running for short periods of time before shutting down (short cycling), you may have a dirty air filter to blame. Maybe your heater is not blowing hot air even though the fan is running. If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. Replacing the sensor should be a fairly easy fix for your contractor as well. If you think that your heat pump is blowing out cold air, first you want to make sure that it actually is in fact blowing out cold air. SOURCE: 1997 audi A4 heater blowing cold air You will have to change the heater core. If you experience any of these symptoms in your home, the first step is the check the thermostat and look for the obvious answers. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. Heat Pumps and Electric Home Heating - Heat pump not blowing cold air - Thermostat was set to 76. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. If you’ve checked all of the easy-to-remedy reasons that can result in your furnace blowing cold air and you still haven’t solved the problem, it may be time to contact your local Carrier® indoor comfort expert to see if your furnace needs to be serviced, adjusted or replaced. My car has 180000 miles. A dirty furnace filter is one of the most common causes of furnace malfunction. All too often, restoring the flow of warm air is simply a matter of opening heat registers. If you have an older furnace with a standing pilot light, it’s possible that the pilot light is extinguished. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. Sometimes, pressing the reset button is all that is required to get your furnace working properly. If you still suspect the problem is a dirty air filter, consult your owner’s manual for instructions on removing and cleaning or replacing your air filter. More often than not, electric heaters blow cold air when its filters are clogged, and that's why it's the first thing you should check. Share this conversation . 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