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