If there is a battery, check if it is working properly. I have replaced the Limit Switch. What should I do? Make sure your fan is set to AUTO and not ON. My furnace seems to be heating okay it is just the blower will not shut off. The capacitor can also be checked with a meter. Make sure that your thermostat is set to HEAT and not COOL, and ensure that the fan is set to AUTO. Also, the furnace is hot and the gas is burning. problems contact webmaster@doityourself.com. View solutions. It's not likely to be the thermostat wires themselves between thermostat and air handler/blower control board as you're able to turn on the fan from the thermostat, It's not likely to be fan wiring, fan motor, fan motor start/run capacitor as the fan runs in MAN or FAN ON mode. Another way to diagnose the problem is by jumping out the thermostat. The … read more. However, it is prone to different kinds of problems. However, when the fan switch is switched to AUTO position, and the room temperature is below the setting temperature, the furnace is on, but the fan/blower is not. Hi Matthew. It does not operate in cool or heat mode nor with the fan set to on. [4] Azel Technologies Inc., P.O. submitted to our "DoItYourself.com Community Forums". Featured Video. The blower fan helps to circulate hot air throughout the home. When this happens, your main concern is to get them running again as soon as possible. The one for the ON position is a different speed. One diagnostic step that can be taken is to put the Fan switch to the “On” position at the thermostat. One of the most common problems with furnace fans is a bad blower relay. The capacitor can also be checked with a meter. If not then the board is bad and not getting power to the heat winding of the blower. If you find that your furnace is not igniting at a time when you need it most, try these easy fixes first in an attempt to get your heating system up and running in a short amount of time as possible. The signal for the fan to run comes from the thermostat. Adjusting the rise and fall of temperature can also help solve the problem. This article series explains the use, setting, and adjustment of the FAN ON- AUTO button or switch or the FAN ON-MAN switch on room thermostats. The fan works just fine when set to AUTO with the AC but not with the heat. These may cause the fan limit switch to stop working properly. If your fan runs continuously, moisture does not have a chance to drip outside. The simplest thing to do is to open up your manual and see if your furnace has a 'G' terminal. You need to open the furnace, find where on the control board the thermostat wire is attached, and verify its wires are connected as you expect. Click on Shop Parts, or select the kind of product you're working with on the left and we'll help you find the right part. If the Y terminal is energized, it turns on the a/c outside unit, but not the blower fan. Some really old furnaces won’t have a switch. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. I could hear the relays clicking occasionally so I investigated a little and found the elements are heating up and cycling, the relay inside the thermostat cycles (not repeatedly just when you turn it on and off), but the fan blower doesn't run/hum/make noise. The heat and fan worked well over winter. Turn the power to the furnace off and disconnect the wires from the thermostat. Tie the red and white wires together, and switch the power on. If the fan motor does not start, the furnace will overheat and the high-temperature limit switch should cause the burners to shut-off. That's green, not ground, on the control panel. Remove your furnace’s access panel. Most common issues with thermostats can easily be fixed if you know what to check for. Replace the wire or thermostat to fix the problem. This can cause the unit not to come on. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Weak Air Flow From RV Furnace. To determine if the capacitor has failed, inspect the capacitor. Your system probably has a manual FAN ON switch on the thermostat, or if not, there may be a FAN ON push pull switch right on the fan limit switch in the air handler. A faulty or dirty ignition or sensor is a relatively easy fix, so follow these steps, and … The furnace fan/blower can be turn on manually (switching to ON position from the thermostat--Maple Chase 9600). Small flathead screwdriver. Gas Furnace Blower motor does not always cycle: Oct 22, 2015: HVAC Heating & Cooling: Electric furnace blower motor doesn't turn on once in a while: Mar 7, 2014: HVAC Heating & Cooling: Furnace blower does not turn on in the auto position: Oct 28, 2010: HVAC Heating & Cooling: Furnace blower comes on first: Oct 1, 2020 The furnace lights up, but the blower will not turn on if I have the thermostat in the auto position. Not sure if it is actually the motor on the blower that is bad because of the fact that I can get the fan to turn if I give it a manual turn. A clogged filter also makes your blower work hard and use more energy. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Kitchen match. Most, but not all, furnaces have a control to force the fan to run continuously, BUT, they may not have run the wire to make it work to your thermostat. I came home from work last night, turned the heat on and it didn't work as advertised. Verify the furnace door is closed fully, as an open door will cause the furnace not to work. If your furnace doesn’t have a switch, simply ignore this step and move on to turning off the breaker. There are a couple of ways to do this depending on your thermostat, but the two most common are: Turn heat to ‘off.’ Small flathead screwdriver. However, the fan will work when the thermostat is set to the ON position. If the W terminal is energized, it turns on the heat and the fan at the furnace. After returning from a trip I found that the blower fan was not operating in my Trane xv80 gas furnace. If you can make the blower run then we know the problem is not with the blower motor or drive belt or assembly and we'd go to step two. This is in effect exactly the same as what happens when the thermostat calls for heat - it's acting as a simple on-off switch (in response to room temperature). We will work this problem just like I would as your HVAC repairman, going from the most obvious causes to some of the less likely problems. [11] Proliphix Corporate Headquarters [Website: proliphix.com] , 3 LAN Drive Suite #100, Westford, MA 01886 Phone: +1.978.692.3375 Toll Free (U.S.): 866-IP-LIVING (866.475.4846) Fax: +1.978.692.3378 - Sales: Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Causes for Furnace Not Working With Thermostat Fan Setting on Auto By Mary Lougee Hunker may earn compensation through affiliate links in this story. to this site, and use it for non-commercial use subject to our terms of use. However, you should consult your manual or the guide on the door of your furnace to make sure that your system does not have different diagnostics. Copyright© Sounds like a no-brainer, but if repairs or maintenance work were recently performed on your furnace, and it’s not working for some reason, you may want to check to ensure that it was turned back on. I have addressed them below and suggest a few things you can try to fix the problem. Filter – The most common cause of furnace problems is a dirty filter. Here are some probable causes behind this situation and ways to deal with them. Since the fan works when set to on but not when set to auto, look at the part of the circuit that turns the fan on. To check for a break in the wire, you can connect terminal R to G on the control board itself. With the fan switch on AUTO the blower works normally in the a/c mode. DoItYourself.com®, founded in 1995, is the leading independent Website operating Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Is your furnace not responding to your thermostat? Flipping this switch and listening for the fan allows you to double-check that the furnace is receiving power. However, when in doubt, consult a licensed HVAC technician to assist you. Which thermostat wires control the furnace fan? Make sure that your furnace switch is “ON” the furnace blower compartment door is on and secure. Some really old furnaces won’t have a switch. This issue is most likely caused by the fan blades rubbing against the fan housing, it may also be caused by a loose or bad bearing within the fan motor. Box 53138 Just cool air blows. We welcome your comments and Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. There are a few things that might cause your furnace to “ignore” a call for heat from the thermostat. If the limit control is not working to turn the fan on when the plenum is warm, the plenum will continue to get hotter; as the burner remains on the plenum temperature will reach the HI LIMIT and a safety circuit in the limit control will turn the burner OFF.Watch out: If this happens don't keep trying to run your heater as you could seriously damage the heat exchanger and even cause it to crack, risking fatal carbon monoxide poisoning of building occupants. 770. So I can assume that the motor/connections are okay. I'm trying to start it up for the fir... Why is my fireplace blower blowing out cold air instead of hot air? Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Sometimes, either the thermostat has been switched off accidentally, or the thermostat has completely gone out. I am having sort of an odd issue. It's not likely to be the fan relay itself since if it were a bad relay the fan wouldn't turn on in MAN or FAN-ON mode either. Your furnace blower fan not starting can have a few causes as you see here. View solutions. Simply look for a standard wall switch on or near the furnace and check if it’s in the on or off position. DO NOT remove the case or disconnect the ducts. Why won't the fan work if the thermostat is set to FAN AUTO? The freezing air makes you shiver, or the summer heat makes you sweat. Even if the burner part of the furnace is not operable, other parts of the furnace are working. To determine if the capacitor has failed, inspect the capacitor. However, if the system is in cool mode and the fan is set to 'auto', nothing happens. Free repair advice! 61 satisfied customers. Replace the wire or thermostat to fix the problem. The furnace burner runs when the fan is on manual and the thermostat is calling for heat. I have a problem with my home furnace. The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. If it does, then the motor is bad. I've got an old Lennox Pulse Furnace. I have an Intertherm Electric Furnace E2EB-015AH. A switch inside the door compartment engages when the door is closed properly. ... the fan motor might be noisy, overheat, or not run at all. Step 1 Press the "Menu" button on the control panel, then select "Security Settings." If your furnace fan is still blowing, continue onto step 2… 2. The diag led just flashes about 1 per second which I gather is good. Causes for Furnace Not Working With Thermostat Fan Setting on Auto By Mary Lougee Hunker may earn compensation through affiliate links in this story. I came home from work last night, turned the heat on and it didn't work as advertised. Remove the door, turn off the LP, disconnect the wiring plug in the furnace, remove the screws in the front bottom just inside the furnace (should be 2 or 3), disconnect the LP line and move it out of the furnace, now pull the furnace out of the case. The unit is controlled from a single wall-mounted panel. Sounds like a no-brainer, but if repairs or maintenance work were recently performed on your furnace, and it’s not working for some reason, you may want to check to ensure that it was turned back on. suggestions. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. Troubleshooting Common Problems with an ... Troubleshooting Common Problems with an Air Conditioner Condenser. It was working fine yesterday ... My furnace blower motor won't come on when I set the t-stat to fan on. Your furnace blower fan not starting can have a few causes as you see here. It does not operate in cool or heat mode nor with the fan set to on. Next check and clean the furnace’s flame sensor. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. I have a Trane central heating a/c unit (about 20 yrs. 1 LED flash (blinking on and off) This means the furnace locked itself out because it tried to ignite three times and could not do so. A furnace blower fan is one of the main components in a hot air furnace or home heater system. Thanks to reader " Check the AFC (automatic fan control) for dust and other accumulation. Any help would be greatly appreciated. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). Another common problem with furnace blower motors not working is caused by the “three D’s”; dust, dirt and debris. Your furnace blower fan not starting can have a few causes as you see here. Replace the wire or thermostat to fix the problem. Furnace filter. Fan will work only when thermostat set to fan on. Kitchen match. In this case it will need to be exchanged for a new one. If the fan motor does not start, the furnace will overheat and the high-temperature limit switch should cause the burners to shut-off. I can also turn the fan mode to "on" and the fan will run. The light switch will typically have a faceplate and an electrical box to house the wires, just like a regular outlet. The blower can also be used without the furnace burner’s ignited. I have a weathermaker 8000 and I replaced the furnace. When your furnace thermostat is not working, your furnace does not know if it needs to work to heat up your home or if it can rest. Sometimes, either the thermostat has been switched off accidentally, or the thermostat has completely gone out. Locate the fan limit switch. Things You'll Need. Vince vlee1973, Oct 28, 2010 #1. You may freely link Continue reading at FAN LIMIT SWITCH TROUBLESHOOTING or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. All information is provided "AS IS." You could look in the furnace and locate the blower wire that is on the heat terminal of the board and then find one that is on park and switch the two and see if the blower runs. Tie the red and white wires together, and switch the power on. Questions of a Do It Yourself nature should be If the furnace starts, the problem is either with the thermostat wire or thermostat. The fan blower should come on. It’s also … This can cause the unit not to come on. Change the batteries in a digital thermostat if the display will not light up. Furnaces use blowers to move heated air throughout household ductwork. If the furnace continually runs, yet no heat comes through the system, you may have a problem with the fan limit switch. Listen for the sound of the spark or watch for the hot surface ignitor to glow (see your owner’s manual). At the heater or air handler, disconnect the thermostat wires entirely - from the two T T terminals and use a small jumper to connect the two T T terminals together. The diag led just flashes about 1 per second which I gather is good. Ph: 905-223-5567 Fax: 905-223-3778 RV Furnace Fan Making a Noise. Here are the things you need to check and what you can do if this is where the problem originates. The motor will be powered by the RV’s 12v power system. Next, you will turn your thermostat to the ‘fan only’ mode. The furnace fans are most often located behind the outside access cover. Hopefully, yours is an easy remedy! Many homeowners discover that their furnace is not working when they go to turn it on for the first time of the winter season. Furnace filter. If no voltage is recorded, you will have to replace the board or the relay. Also, if I procrastinate getting a new motor fan (or whatever I do need), am I causing damage to my furnace by having it kick in and run without blowing the heated air through the vents? Click on Shop Parts, or select the kind of product you're working with on the left and we'll help you find the right part. The motor will provide power through a shaft to both the main furnace fan and to the combustion air fan. If your fan was set to run continuously at either the thermostat or at the limit switch you'll need to turn that feature off. It is an older furnace, and I have checked the thermostat settings. Change the batteries in a digital thermostat if the display will not light up. Jason Whatley. If it doesn’t then you probably have loose or burnt wires in behind the relay or you may need a new fan relay or circuit board. Another way to see if your furnace is receiving power involves the toggle switch on the side that allows you to manually turn on fan-only operations. If the capacitor is bulging or leaking, replace it. Typical thermostats will energize the G terminal when in cool mode, or when the fan is turned to manual "always on" mode. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. All rights reserved. Electronic Ignition Furnace On an electronic-ignition furnace, turn down the thermostat or turn the power switch off and then on again to reset the ignition control module. The outside unit and the furnace do work. Turn the power to the furnace off and disconnect the wires from the thermostat. All furnaces have a basic power switch. Click on Shop Parts, or select the kind of product you're working with on the left and we'll help you find the right part. If the capacitor is bulging or leaking, replace it. You are looking for a blinking green light. This is typically the problem if you can hear your furnace click on but it does not fire up. One diagnostic step that can be taken is to put the Fan switch to the “On” position at the thermostat. [5] Honeywell Controls, the company wants you to use their contact form at this web page: http://www51.honeywell.com/honeywell/contact-support/contact-us.html, Honeywell product model numbers & instruction Manuals: see http://yourhome.honeywell.com/home/Applications/FindYourModelNumber.aspx. Thornhill, Ontario, Canada L3T 7R9 If the wires look right, and your thermostat wiring matches, it's possible there is a break in the wire. These three alone can cause overheating of the motor, which in turn causes the windings and bearings to burn up quicker. Furnace turns on, but no heat, and fan not kicking in... Lennox Conservator III G16 What do you guys think is wrong when you hear th... Hello everyone. If you can make the blower run then we know the problem is not with the blower motor or drive belt or assembly and we'd go to step two.

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