Walk to the AC/heating unit and listen for the motor to turn on. 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. Tie the red and white wires together, and switch the power on. Air conditioner is turned off but fan keeps running. Furnace blower won't turn on [ 8 Answers ] I have a Bryant 395C furnace. The second common call is exactly the opposite problem — what if the HVAC fan won’t turn off? JPicasso OP enthusiast JPicasso OP enthusiast. 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. … read more. Check out what he's been through, and why he should have asked an expert from the start. The trouble relates to the blower motor and its activation. When the AC gets the house to desired temperature, the outdoor compressor will shut down, but the house blower continues to run. Before calling your service technician out to start replacing components, check the thermostat settings first. The reason your air conditioner won't turn on could be because the condensate drain line is clogged. Trane 2TTX4060 - inside blower will not come on even with 'fan' switch on thermostat. 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 … Older furnaces will use either a sequencer relay or a simple peanut relay. Show Less. The blower does run when set to on, but won't run on auto and cool. Car starts fine, but now the AC blower won't turn on at any setting. 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. Hopefully, yours is an easy remedy! My blower fan for the heater/AC wouldn't turn off. I believe it's straight ac, not a heat pump. My problem is on a 1996 Dodge Caravan 3.3 liter. 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. When your HVAC blower never stops running, your first stop is the thermostat. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. (I don't know much!). Thanks to all with this info. It has A/C but is a short body and has no rear heat or A/C. On some air conditioners the speed settings do not allow the fan or compressor to shut off. It's the main fan inside the unit that blows the air. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. Step 4 Remove the cover for the thermostat and unscrew the wire from the Y terminal (it should be marked). Here’s an easy way to test if the fan’s capacitor is bad. I have a Bryant 395C furnace. 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 . Blower has 3 wires going into circuit board on furnace. 516 satisfied customers. Look for a blown fuse or tripped circuit breaker. I've verified that I'm getting 24V AC between terminals marked G and C on the furnace. Circut breakers seem to be fine. Joseph Gauthier Sr Jul 31, 2014 ... Last Winter my heater blower fan worked only on High. 1; 2; 3 ... With the fan switch on AUTO, the blower works fine in the AC mode. If I manually switch to the ON position, the fan runs. 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. This Q&A were posted originally at FAN ON AUTO MAN Thermostat Switch FAQs. I really did not look forward to finding the green wire and disconnecting it. 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. This problem will depend on what type of gas furnace you have. So make sure this power switch is in the “on” position. 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). 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. This seems to be a common problem for a lot of RV owners. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago. 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. AC unit won't turn on: both inside blower fan and outside fan unit won't turn on. 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. Blower has 3 wires going into circuit board on furnace. When AC units run, they create condensation, which is removed from the unit through a drain line. 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. If the fan continues to run, there could be a problem in the thermostat or the wiring. 2020/01/21 Anonymous asked: Fan will work only when thermostat set to fan on. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. If there was a power surge, your air conditioner might have blown a fuse or tripped a circuit breaker. The main culprit may be the control board or your thermostat is faulty. Air Conditioner Outside Unit Fan Not Working. The thermostat is what tells these separate systems to work together. My blower motor does come on. The Haynes manual … So, you do some investigating and realize that even though the outside unit is buzzing, the fan isn’t spinning. 2001 330Ci radiator suction fan won't turn off at all. 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. 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. Slide a long, thin wooden stick through the fan grate and gently push one of the blades to try to get the fan spinning. I replaced the fan/limit switch and verified that it works correctly. Jump to Latest Follow 1 - 20 of 42 Posts. 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. Share this conversation. (Safety note: DO NOT use any kind of conductive metal or material to do this. I've verified that I'm getting 24V AC between terminals marked G and C on the furnace. Answered in 11 minutes by: 7/2/2012. 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. Joined ... All the other climate control functions appear to be working (things turn on and off), yet the blower fan continues to run. I don't know for sure if it had a condensate switch- I guess I'm just assuming. Fan not working on 1, 2 or 3 but works on 4 = resistor pack is source of problem. Furnace fan/blower won't turn on in AUTO mode. Blower won't run when AC comes on. So after having to reset all the clocks in the house I googled what to do. ComfortZone. ac fan won't turn off problem, and notify you when a new solution is offered. Show More. BillyHvac, … Turn the power to the furnace off and disconnect the wires from the thermostat. Registered. 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. Even well … When a Car Fan Won't Blow . Setting it to “off” turns off the blower, causing the inside unit to freeze, which makes your entire AC system shut down. At the furnace or air conditioner … Joined: Nov 2003 Posts: 257 Kalamazoo,MI: My Blower motor for the AC won't turn off. 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. Your furnace blower fan not starting can have a few causes as you see here. If it doesn't, there could be something wrong with the thermostat. Here's what I've done so far. The heater and blower work. The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. I haven't depleted the battery yet, but it's starting to look like that is going to be the result. Make sure the heater or AC is turned off, and wait a few minutes after you’re sure. If the furnace starts, the problem is either with the thermostat wire or thermostat. As did the author of this letter, you want your fan back. Thanks again barrie : Wed Dec 21 2011, 03:26am The A/C wont work without the fan. More modern gas furnaces will have a control board. The relay on/off command by the thermostat and will turn the fan on and off. My Furnace & AC Won't Turn On By Cleveland Van Cecil ... Set it to turn on the AC or heat. 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. 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. Check Your Furnace Blower Fan. Even when I turn off the "cooling" and attempt to just have the indoor fan, I get nothing. When the drain line becomes clogged, a safety switch trips and shuts down your air conditioner. Replace the wire or thermostat to fix the problem. RV AC Fan Keeps Running - Won't turn off. So, if the capacitor attached to your fan motor is bad, the fan won’t start spinning. To get those turned off, you have to switch your setting to automatic. The blower won't come on even when thermostat fan switch is set to "on." 2. 1. 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? Trane 2TTX4060 - inside blower will not come on even with fan. That way the compressor won't engage if the blower fan is turned off (bad things for a/c freon pressures). Those problems are explained at THERMOSTAT WON'T TURN OFF. Ask Your Own HVAC Question. I did have a bad run capacitor and replaced that, but still the same problem. Associate Degree. The blower won't come on even when thermostat fan switch is set to "on." In the heater mode, the burners fire but the fan doesn't come on. Fan won’t work when thermostat set to fan auto. 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2020 ac blower fan won't turn on