Forced air heating or cooling air handler troubleshooting: blower fan won't shut off: This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do soThese same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. We explain what switches or controls may be set improperly or what else, such as a shorted wire, can cause continuous HVAC fan operation. First, confirm that the room thermostat is not calling for heating or cooling. In the heating season, just set the thermostat(s) to the lowest setting and confirm that room temperature is above that point. In the cooling season do the opposite - set the thermostat to its highest setting and confirm that room temperature is below that point. You have told the thermostat to turn off the HVAC equipment. If the equipment was running give it three to four minutes to shut down. Next: If the blower just keeps running no matter what, there are two places to check switch settings before calling your heating or air conditioning service company in response to a furnace fan or air conditioning fan that just keeps running without stopping:

1. At the room thermostat: the FAN-AUTO-OFF or FAN ON/OFF switch on the room thermostat should be checked. how to clean a home ac unitThe fan control should be set to AUTO. what is the best in-wall ac unitYou can try turning the switch to OFF too.home central ac units for sale Details of checking the thermostat's FAN-AUTO-OFF or FAN-ON switch position when the furnace (or air conditioning) fan won't stop running are at FAN WONT STOP - THERMOSTAT SWITCH Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. Those problems are explained at THERMOSTAT WON'T TURN OFF. 2. At the furnace or air conditioner air handler or blower unit: the FAN LIMIT SWITCH may include a switch that manually keeps the fan running.

We discuss this switch here. Take a look at the fan limit control switch. Before pulling the cover off of the switch, just see if the switch includes a control such as the white push-pull switch like the white device shown at the lower left in our photo. Depending on the position of this switch (pushed-in or pulled out) the fan may be on manual override - causing the fan motor to run continuously. Check the printing on the switch face to see if you should push the switch in or pull it out to leave the blower on "Auto". ("Man" or "Manual" would be forcing the fan to run.) Usually: "Push-in" position on this (Honeywell) fan limit switch is for continuous fan operation and "Pull out" position is for automatic fan operation. There are some reasons (explained at BLOWER FAN CONTINUOUS OPERATION) to leave the blower fan on continuously for long periods, such as to use an air filtering system to improve indoor air quality. And in some buildings we may run the blower continuously for more even or better conditioned (heated or cooled) air distribution.

On the off chance that someone has inadvertently mis-connected or shorted fan control wires at the fan limit switch, also check out FAN LIMIT SWITCH INSTALLATION. On the chance that there is a shorted thermostat wire, a problem that can also cause the A/C or warm air furnace fan to run continuously see THERMOSTAT WON'T TURN OFF. Details about the manual FAN ON or FAN AUTO ON switch right at the furnace or air handler at the manual at BLOWER FAN CONTINUOUS OPERATION. This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. My fan keeps running with no heat on furnace. What can I do? If the furnace does not even try to run, that is if it never even starts, then follow these steps:

If the furnace tries to start but cannot keep running then there is a different problem such as no fuel or an unsafe condition. See DIAGNOSE & FIX HEATING PROBLEMS-FURNACE - home A complete list of oil and gas fired furnace controls is at FURNACE CONTROLS & SWITCHES Continue reading at FAN LIMIT SWITCH or select a topic from the More Reading links or topic ARTICLE INDEX shown below.This is a post by my husband Aaron who, thankfully, installed the window air-conditioner unit right next to the bed so it can blow on my pregnant self all night. That thing is such as life-saver this summer!- Anna As summer rages on and the heat increases we all look for ways to stay cool. Most people, in their time of thermal distress, turn to the air conditioner, one of the more costly, but effective ways to stay cool. Granted, it will always be costly if you chose to use an a/c, but there are ways to keep the cost down. We use pretty much all these tips and they work great.

Lets quickly dispel the biggest myth first. Is it cheaper to run the air conditioner all day or turn in on just when you get home? It works something like this. Heat likes to go where it’s not hot. When you hold your fridge door open too long, what happens? The motor kicks on to keep the fridge and everything inside of it cold. That’s because heat is rushing into the cold cavity of the fridge. Your house works the same way. If you are constantly cooling your house, heat is always looking to get in and the air conditioner has to constantly work to keep that heat out. If you leave the a/c off during the day, the house will heat up and then stop heating because the heat is already where it wants to be. When you get home and turn on your a/c, the air conditioner has less heat to remove, so it uses less energy and less money. Or look at it this way: you can leave the a/c on all day and constantly remove heat or turn it on when you get home and remove it all at once. The most cost-effective (and environmentally friendly) technique is to just turn it on when you’re actually home.

Now that that big ol’ myth is cleared up, lets look at 10 more ways to save money while using a costly air conditioning unit… 1. Raise the temperature a few degrees Did you know, according to Mr. Electric that “each degree below 78 degrees farenheit will increase energy consumption by 3-4%”? So, set the air conditioner a few degrees warmer and pay less. 2. Use the air conditioner in conjunction with a ceiling fan This may sound counter-intuitive to run two appliances at once, but ceiling fans are inexpensive to operate, and can help cool your body letting you raise the a/c temperature a few degrees. A quick note on fans: ceiling fans (and fans in general) don’t actually make the air cooler. Fans work by blowing the hot air surrounding your body away from you. Its like when you blow on a hot spoonful of soup. You don’t have “arctic breath” you are simply blowing the heat off the food, so it gets cooler. That’s essentially what a fan does… it blows the heat your body is generating away from you.

Plus, if you are sweating, the fan will cool you by evaporation. 3. Clean the air filter every week When the filter is clogged, the air conditioner has to work harder. The harder it works, the more money it costs you. It takes me just a few minutes to pop out the filter and clean it. 4. Cool only the rooms you are in. Why cool the kitchen when you are in the office on the other side of the house? Quick note: obviously, this isn’t always possible with central air conditioning. Central a/c is expensive and uses a lot of energy mainly because it’s cooling the entire house. Window units, while still expensive are more economical. If you have central air in your house, try shutting the vents in the rooms you are not in so the cool air gets re-routed the rooms you are using. 5. Buy the right size air conditioner for the room Oversized a/c’s are inefficient and waste money. Sure, they might cool the room down a few minutes faster, but they use more energy.

The converse is true too, a smaller air conditioner in a large room will have to constantly work to keep it cool. The proper size one will cool the room down, then it will shut off (if you have that feature activated which we recommend doing). Here is a handy guide on how to select the correct size of air conditioner unit for a room. 6. Use window shades and blinds to block direct sunlight The cooler you can keep your house, the less heat there is that has to be removed. Our old apartment was west-facing and a corner unit so every afternoon our living room got blasted by the sun. We ended up purchasing these white paper accordion shades from the home supply store for just $6 and cut them with scissors to fit the windows (overlapping them in spots to get the right fit). We placed the paper shades behind the standard window blinds in the apartment and that really helped to keep the heat out. They were white, so not only did they help block the heat, they also helped to reflect the light away from our living room.

7. Seal the windows and doors Cold air that escapes is cold air that has to be replaced, and that means money is sliding on out of your place. Properly sealed doors and windows will help keep the costly generated cold air in. It works just the same in winter time with the heat. Save some bucks by getting a few draft blockers for the bottom of your doors. 8. Keep the back of the air conditioner unit clear and free of debris In order to get cold air out, you first have to suck in air. If the airflow is restricted, then the unit will have to work hard and that means it will hurt your pocketbook (what is a pocketbook anyway?). 9. Keep the lights turned off This is a good energy-saving tip any time of the year, but especially in the summer. Touch a lightbulb that has been burning for a while and you’ll see what I mean. Adding extra heat into a room you are trying to cool won’t help you save money so keep the lights off. 10. Keep the oven off Along the lines of tip #9, reduce heat from cooking by forgoing the oven, and by using the microwave instead or try making meals that don’t require using the oven at all.