Blower won't run when AC comes on. Trane 2TTX4060 - inside blower will not come on even with fan. Share this conversation. Today my car’s AC fan wouldn’t come on at any speed setting, only to come on later in the day… what could it be? If the furnace starts, the problem is either with the thermostat wire or thermostat. 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. Replace the wire or thermostat to fix the problem. Furnace/AC blower hums but won't turn on ... but I grew up in a house without air conditioning and one summer my parents got the bright idea to leave the furnace fan running at all times. 1. Furnace blower won't turn on [ 8 Answers ] I have a Bryant 395C furnace. If your blower fan is continuing to run after the system has already turned off and you made sure your thermostat isn’t set to the ‘on’ position, then you’ll want to … Blower has 3 wires going into circuit board on furnace. Thanks again barrie : Wed Dec 21 2011, 03:26am The A/C wont work without the fan. 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. Answered in 11 minutes by: 7/2/2012. Joined: Nov 2003 Posts: 257 Kalamazoo,MI: My Blower motor for the AC won't turn off. It has A/C but is a short body and has no rear heat or A/C. 2. I've verified that I'm getting 24V AC between terminals marked G and C on the furnace. It is as if I had gone to the circuit breaker and cut the power to the whole HVAC system, but I didn't. When I turn on the AC, the condenser has a quiet hum and the fan won't spin. Setting it to “off” turns off the blower, causing the inside unit to freeze, which makes your entire AC system shut down. Check out what he's been through, and why he should have asked an expert from the start. Registered. Here’s an easy way to test if the fan’s capacitor is bad. I've been searching around and saw that in most cases, either the inside or the outside unit won't turn on, but I have not found a case where both won't turn on. Trane 2TTX4060 - inside blower will not come on even with 'fan' switch on thermostat. In the heater mode, the burners fire but the fan doesn't come on. Make sure the heater or AC is turned off, and wait a few minutes after you’re sure. I really did not look forward to finding the green wire and disconnecting it. I don't know for sure if it had a condensate switch- I guess I'm just assuming. Turn the power to the furnace off and disconnect the wires from the thermostat. Fan won’t work when thermostat set to fan auto. JPicasso OP enthusiast JPicasso OP enthusiast. SOURCE: 88 cadillac deville, ac blower fan wont shut off, Ralph, Most common cause of this is the blower fan (proper name for the fan you refer to) continuing to run is a shorted out Electronic Climate Control Module. Joined ... All the other climate control functions appear to be working (things turn on and off), yet the blower fan continues to run. Hopefully, yours is an easy remedy! I haven't depleted the battery yet, but it's starting to look like that is going to be the result. (Safety note: DO NOT use any kind of conductive metal or material to do this. Maybe you notice that there is warm air blowing through your vents—despite the fact that you are good about changing your AC filters and you’ve never had any type of problem like this. Show Less. That way the compressor won't engage if the blower fan is turned off (bad things for a/c freon pressures). This seems to be a common problem for a lot of RV owners. Air Conditioning or Heating System Blower Fan ONLY Runs if on FAN-ON or MAN Question: fan works only if thermostat set to FAN ON . 2020/01/21 Anonymous asked: Fan will work only when thermostat set to fan on. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago. Furnace fan/blower won't turn on in AUTO mode. When the AC gets the house to desired temperature, the outdoor compressor will shut down, but the house blower continues to run. All the normal AC lights come on on the dash, and I can hear the engine revs changing when the compressor kicks in, but no air comes from the vents at any of the 4 fan settings. At the furnace or air conditioner … There are some serious problems that can cause these issues, but typically, when your AC won't turn on, you have about a 70% chance of solving the issue yourself. Joseph Gauthier Sr Jul 31, 2014 ... Last Winter my heater blower fan worked only on High. Jump to Latest Follow 1 - 20 of 42 Posts. ComfortZone. The second common call is exactly the opposite problem — what if the HVAC fan won’t turn off? Even when I turn off the "cooling" and attempt to just have the indoor fan, I get nothing. Blower has 3 wires going into circuit board on furnace. The blower does run when set to on, but won't run on auto and cool. Your furnace blower fan not starting can have a few causes as you see here. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. If there was a power surge, your air conditioner might have blown a fuse or tripped a circuit breaker. This Q&A were posted originally at FAN ON AUTO MAN Thermostat Switch FAQs. The power signal to the ECM and fan module (both which have a say in engaging the a/c compressor or not) comes from the blower motor circut. When your HVAC blower never stops running, your first stop is the thermostat. To get those turned off, you have to switch your setting to automatic. My blower fan for the heater/AC wouldn't turn off. When the drain line becomes clogged, a safety switch trips and shuts down your air conditioner. The thermostat is what tells these separate systems to work together. The trouble relates to the blower motor and its activation. As did the author of this letter, you want your fan back. Look for a blown fuse or tripped circuit breaker. The reason your air conditioner won't turn on could be because the condensate drain line is clogged. My Furnace & AC Won't Turn On By Cleveland Van Cecil ... Set it to turn on the AC or heat. So after having to reset all the clocks in the house I googled what to do. Slide a long, thin wooden stick through the fan grate and gently push one of the blades to try to get the fan spinning. When AC units run, they create condensation, which is removed from the unit through a drain line. If it doesn't, there could be something wrong with the thermostat. It's the main fan inside the unit that blows the air. Associate Degree. Check Your Furnace Blower Fan. More modern gas furnaces will have a control board. The main culprit may be the control board or your thermostat is faulty. If the fan continues to run, there could be a problem in the thermostat or the wiring. So, you do some investigating and realize that even though the outside unit is buzzing, the fan isn’t spinning. My problem is on a 1996 Dodge Caravan 3.3 liter. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. 516 satisfied customers. Circut breakers seem to be fine. I did have a bad run capacitor and replaced that, but still the same problem. I've verified that I'm getting 24V AC between terminals marked G and C on the furnace. 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. Walk to the AC/heating unit and listen for the motor to turn on. AC Fan won't shut off #463361 06/13/08 11:44 AM 06/13/08 11:44 AM: Joined: Nov 2003 Posts: 257 Kalamazoo,MI. When a Car Fan Won't Blow . The blower motor resistor or blower module gets hot as it powers the fan so, often times, they can burn out causing certain speeds of the fan in your car to stop working, the fan can be stuck on one speed, only work on high speed, or not work on any settings. Well, I don’t think it’s the fuse (otherwise the fan wouldn’t come on at all,) it’s probably not the blower motor resistor either. Car starts fine, but now the AC blower won't turn on at any setting. AC unit won't turn on: both inside blower fan and outside fan unit won't turn on. The blower won't come on even when thermostat fan switch is set to "on." Question: I have a problem that may cause me to dump my 2001 330Ci, the electric suction radiator fan won't turn off even when the ignition is off, I was unplugging it so it wouldn't run the battery down when parked. So make sure this power switch is in the “on” position. If I manually switch to the ON position, the fan runs. The blower won't come on even when thermostat fan switch is set to "on." Those problems are explained at THERMOSTAT WON'T TURN OFF. Here's what I've done so far. The Haynes manual … Older furnaces will use either a sequencer relay or a simple peanut relay. I believe it's straight ac, not a heat pump. The heater and blower work. RV AC Fan Keeps Running - Won't turn off. Step 4 Remove the cover for the thermostat and unscrew the wire from the Y terminal (it should be marked). My first thought was maybe if I turn off all the power it would shut off - NOT! Your blower fan is what pulls the uncomfortable air out of your home, sends it through the air conditioner or furnace, and then distributes it back into your home. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. This problem will depend on what type of gas furnace you have. On some air conditioners the speed settings do not allow the fan or compressor to shut off. Before calling your service technician out to start replacing components, check the thermostat settings first. Show More. A furnace blower that won’t turn off will run up your energy bills and shorten the life of your furnace equipment (both expensive problems). My blower motor does come on. ac fan won't turn off problem, and notify you when a new solution is offered. Thanks to all with this info. So, if the capacitor attached to your fan motor is bad, the fan won’t start spinning. 2001 330Ci radiator suction fan won't turn off at all. I have a Bryant 395C furnace. 1; 2; 3 ... With the fan switch on AUTO, the blower works fine in the AC mode. I replaced the fan/limit switch and verified that it works correctly. Ask Your Own HVAC Question. If your air conditioner won't turn on, it's important to troubleshoot a few key things before you call in an HVAC technician, as this can save you time and - more importantly - money. Even well … BillyHvac, … It does sound like it could be that because ac wont turn on with out any fan but not even the light will come on when you push the ac button does that sound right. The relay on/off command by the thermostat and will turn the fan on and off. The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. These are colored red, black, and white; red is connected to a terminal marked "LO," black connected to "HI," white to "COM." (I don't know much!). Air conditioner is turned off but fan keeps running. Air Conditioner Outside Unit Fan Not Working. … read more. Fan not working on 1, 2 or 3 but works on 4 = resistor pack is source of problem. Tie the red and white wires together, and switch the power on. Marked G and C on the furnace starts, the blower does run when to! As did the author of this letter, you do some investigating and realize even... 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