If you have a heat pump, go to step 2. Many people have experienced the very uncomfortable and inconvenient phenomenon of a system blowing warm air instead of cold. If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace is … Furnaces tend to put out about 130 to 140 degree air. You may have noticed a loud sound right before cold air blows out through the vents in your home. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Yeah, that’s a lot of possibilities. I run the settings on the thermostat back to the heating cycle and the house warms back up only to change back to cool maybe 8-24 hours later again. In contrast, a heat pump running by itself (with no supplemental backup heat) on a 35 degree day, depending on indoor house temperature might only put out 92 degree air. Refrigerant absorbs heat from the outside air and moves it indoors with the help of a reversing valve and multiple check valves. A Note About Our Hours and COVID19: Open As Usual! If it does, that means the speed used by A/C is dead. KEEPING THE HEAT ON CONSTANTLY. Trying to reset thermostat from Heat and Cool.Followed directions from web site and it went to a Heat and Cool option. For example, let’s say that you wake up to a cold home (62° F) and immediately raise the thermostat to 68°. In the winter, your heat pump picks up heat from the outside and dumps it into your home (yes, even when it's cold outside). Thankfully, this is an easy fix. This means your blower is running constantly, even when the burners aren’t on. The reason for this, is that in the cooling mode, the outdoor coil actually becomes hot. If the leaks aren’t excessive, a professional may opt to repair single leaks. What to do: Set your thermostat to “AUTO” (see picture below). If there is a white wire or no wire in the O/B terminal, you probably have a conventional system, not a heat pump. Two thermostat issues that could cause your furnace to blow cold air include: Yeah, we know the first one seems like a pretty silly problem but you’d be surprised by how many residents in Phoenix leave their thermostat set to COOL year round and just forget about their HEAT button altogether. After I do this the thermostat will cool on auto for that day and then the next day I do it again. info@idealenergyaz.com4127 E. University DrivePhoenix, AZ 85034. If the filter looks like the filter to the right in the picture below, replace it. Depending on the system, you might have to replace the blower, or simply run it at a different speed for A/C. Outdoor equipment. The reason for this, is that in the cooling mode, the outdoor coil actually becomes hot. While the system is in cooling mode, the frost that had built up on your outdoor coil then turns to water, runs down the outdoor coil, and piles towards the bottom. A heat pump puts out much cooler air than a gas or oil furnace does, which most customers are used to. Ductwork with a loose connection. You will not be able to adjust the temperature range in Auto mode below this value. Once it gets close to the actual setpoint, the aux heat de-energizes and the heat pump mode of the system remains operating to generate heat and will shut off if the temperature is satisfied. Instead, you’re blasted with cold air. 3. If your heat pump is not blowing hot air, there are typically three main causes: Unit is blocked: Your heat pump pulls heat from the air outside into your home. In the winter, that same humidity is pulled out of the air, but it comes in a form of frost on the outdoor coil (condenser). If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. (You should have a wire in “Y2” if you have more than one stage.) When your home drops below or rises above a certain set temperature, it triggers the heating or air conditioning to heat or cool your house. Tweet “Is it cold in here or is it just me?” You may have asked this question enough times in the last few days that you find yourself having to double check what you set your thermostat to. If your thermostat looks like this, make sure you change it to HEAT. You see, a clogged filter restricts the amount of cool air that runs through your furnace’s system and causes the unit to quickly overheat and shut off. Source. Otherwise, I have to leave it set to the on position leaving it run all day. Tap Advanced Set Up. This means your blower is running constantly, even when the burners aren’t on. Set your thermostat’s mode to Heat. Heat/Cool Minimum Delta: The minimum temperature difference between the desired Heat and Cool set points in Auto mode. aux heat comes on in cool mode. Then see if the blower starts with the A/C. Check your air filter. If the heat does not come on even when the thermostat is set above room temperature, then you probably have a blown fuse or a tripped circuit breaker. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. Often rodents can get to low voltage wiring between thermostat and air handler, and when they gnaw on wiring, various shorts occur. It comes after parts of the UK saw between four and eight centimetres (1.5-3in) of snow to start the weekend. In order for the furnace to start running, you need to set the thermostat for a temperature that requires the air to be warmed up. As the frost builds up on the outdoor coil, it could potentially inhibit the ability for air to flow across that coil. But, if the switch is bad, they’ll need to replace it. Of course, any central residential HVAC system is supposed to provide cool air when it’s warm outside and heat when the outside temperature drops. This delay is to protect your equipment from short cycling. Check out this article, on how to tell if your unit is a heat pump or air conditioner. If you have an older furnace with a standing pilot light, it’s possible that … That cold air mixes with the warm air from your furnace, causing the air coming from your vents to feel considerably cooler than it should. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. If the heat does not come on even when the thermostat is set above room temperature, then you probably have a blown fuse or a tripped circuit breaker. If something’s wrong with your heat pump, use this setting to keep your home warm until a technician can repair the problem. Don't know if you have a heat pump? Which is 1.5 to 2 degrees lower than thermostat set point - the electric heat or auxiliary heat would then come on to make up the temperature difference. The other settings on your thermostat matter too. If you see steam coming out of your outdoor coil that is a normal operating procedure for a heat pump system, so don't be alarmed. If your furnace continues to overheat and blow cold air after you replace the filter and open all supply vents, have a professional inspect the system for other issues. As the title mentions, I can only get this to blow heat when it comes on. Your blower is running constantly, even when your furnace fan is set to AUTO! 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