(The same model you show, only I'm confused as to the direction yours are inserted.) Your air conditioner could be blowing fuses due to some issues that begin and end in the fuse box itself. As stated earlier, allowing too many amps to flow to your condenser will cause it to break down and possibly be fatal to the unit. Fuses can get hot sometimes so that by itself doesn't mean they are the problem. The 20A fuse was blown. If you suspect your fuses may be blown, the first thing you'll notice is that the A/C unit outside is not doing anything. Cheap too. The T handle is in and I checked power from top to bottom so I know that is good .What am I missing. Your meter should now read voltage in the range of 220 to 240, give or take a few volts. Most never do and if you could see how plugged those get you'd see why they are common enemies of airflow. This means you'll be having this problem again soon. Working many hours after replacement. The furnace sends 24v to the A/C contactor which then connects the power and lets the A/C run and that makes a humming noise. Just some suggestions and don't mess with the contactor unless you're confident on how to work with the electrical. If you have a fuse box, look for blown fuses and replace any blown fuses that you find. The entire top was pushed up and it was very obvious that it was bad. Answer: The box just means it can handle up to 60 amps and the fuse determines what the protection is. This tells you the power is making it through the fuses (like it should). It is on a different breaker in the panel than the outdoor unit so be sure you've checked both. I would probably call HVAC first, but it’s a bit of a coin toss. 99 ($3.50/Item) The stat tells the furnace to tell the A/C to run. Sorry if that's not what you want to hear. We had a clogged drain which my husband unclogged. The most probable of these are – 1. Thanks for reading. Why Air conditioner Keeps Blowing Fuse In Circuit Board? Without the stat, there will be no A/C call. Some AC systems also have a fuse at the shut-off box. It is important that you buy the right size fuses for your air conditioning system. Thanks again! Is there a fuse on the air handler that may have blown? If the band is broken or melted, replace the fuse. Never insert anything in the disconnect to bypass the fuse. Question: Why is the 3 amp fuse blowing in the furnace? We also just changed the filter also. My heat is not working and was getting a burning smell when it was upon investigation I found my disconnect box in the house didn't have fuses or breakers inside it had what appears to be 2 copper pipes and the wires in the box are burnt up. Any ideas??? If you don't have fuses then it may have tripped the breaker. First at the power to the furnace to make sure you have that, then 24v from the circuit board to the stat and 24v going from the circuit board to the outdoor unit. on June 08, 2018: After a repair guy got the unit running, worked great for a week. Check power to outdoor unit as well. Remember, if what you find in your system doesn't match up to what I've explained here, don't guess. Obviously, we don't have any power but the furnace doesn't know that and will continue to ask the A/C to run. I replaced the contactor and capacitor and defrost control board. But there are no fuses on the outside in the box on the house. Where might the problem be? I have learned a lot and even buying several parts was still less than a service call thanks to people like you who give diyers the info they need. If your AC unit won't turn on, the first thing you should check is if there was a blown … If you think that's what it is you can replace it for just a couple of dollars to see before getting into larger repairs like a motor or circuit board and if it's not, you're only out a couple bucks. Check the fuses in the disconnect box located outside, near the condenser, to make sure there’s power. So if you tried what I've listed here without success, have a look at my article How to Diagnose and Repair Your Air Conditioner (A/C) Capacitor. Vern, I'm not sure I understand. This kind of image (Air Conditioner Parts Diagram | Wiring Diagram And Fuse Box Diagram pertaining to Central Air Conditioner Parts Diagram) preceding can be labelled along with: central air conditioner parts diagram, central air conditioner parts list, central air conditioning parts diagram, . Also saw burn marks on disconnect plug. You may have saved my life and my home from fire! In a pinch, you could use a fuse that is rated for a lower amperage than the ones you need, but never more. If it hasn't, it may be your air conditioner's capacitor that's the issue. Check the "Heat/Cool" switch to see if it is set correctly. Year of production: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013. I do believe these can be found at places like Home Depot and Lowe’s. Watts do not fit in the use. Most residential air conditioners are wired into a 25–50 amp circuit breaker based on the unit size and maximum amp rating for your specific unit. Try Air Conditioner Coil Cleaning. Hello Dan, My Ac quit so I checked the fuses. ValAdam - Yes it could be and that motor has a capacitor on it that can sometimes be the issue. Here you see fuses rated for different amps as well as the differences in physical size and how fuse reducers (far left and right) can help fit new smaller fuses to old disconnects. The "leads" are what I'm holding here and the "lug" is what I'm touching them to. Answer: It sounds like the lightning may have shorted the unit or panel if it’s blowing a new fuse like that. Going to replace all of it. I have another Hub on fuses if you'd like to check. I bought new and we put them in with the notch down and the condenser unit hums but the fan doesn't turn. The 25A fuse looked very old and the 20A looked newer. The "leads" are the voltmeter's wires. I accidentally nicked a brown wire going to my condensing unit with a machete. To do this, disconnect the air conditioner from the switch that is generally found in front of the compressor. Thanks for the information! From there, it could be an issue in the furnace. I like to know I've been able to help people with these minor repairs that can cost them a lot of money. Central air conditioner fuse box welcome to my web site this blog post will go over regarding central air conditioner fuse box. They have hard metal on the end with insulated grips that make the test safe. Thank you for reading and commenting. Should I be using 30 amp fuses then? The parts are covered by the manufacturer however and can be claimed by any service company. To protect the unit against them. My roommate took the fuses. For those of you who don't have a voltmeter, it's really not a big deal. They are the screws that hold the wires down. 60 Amp 240-Volt Non-Fuse Metallic AC Disconnect The 60 Amp 240-Volt Non-Fuse Metallic AC The 60 Amp 240-Volt Non-Fuse Metallic AC Disconnect is designed to stop the power going to an air conditioning unit to allow for safe working conditions. I found out that the fuses can go either way, which is what I suspected, but thought I would ask. At first I thought your comment was on another Hub. It just hums. Before you change the fuse, check the old blown fuse. Heat is one of the worst things for electrical equipment like an A/C. Check the volt capacity of the fuse in the disconnect box. I did see a comment that they are connected to the furnace..(see I am new at this) it’s running just fine..the fan is not blocked..any suggestions would b helpful if it’s none of the above..before I contact a specialist..thank you. We tried to spin the blade and it worked, but no cold air in the house. Would the fan have a fuse also? My outside unit is running. If the old fuses are bigger in size than the new fuses (we're talking about physical size here, not amperage), you will also need to buy what is called a fuse reducer. Will it work? Let's go through this process first and then, for those of you who don't have a voltmeter or are uncomfortable testing voltage; I will give you another method for checking the fuses. Now I know how I can cut costs, as I constantly call the A/C service men. We flipped the breaker (didn't come on and neither did the thermostat). The wires will be labeled the "line" (which is the incoming power) and "load" (the outgoing power). Now you can remove the fuses either by popping them out with your hands if they are in the handle itself or, if not, by grabbing them with a pair of pliers with insulated handles. The box containing the fuses is different from the one described by you. Make sure you check your filter and have you had the evaporator coil cleaned? On the thermostat it still shows the blinking snow flake. These will fit onto each end of your smaller fuses and make up the difference of the physical size. I'm glad I was able to help even if in a small way. This means that the red lead from your meter goes the lug of the black "line" wire and the black lead from your meter goes on the lug for the white "line" wire. What else should we check. You should be able to find the size of fuses you need, buy them at your local "big box" retail store, and put them in to test if they were the problem. Thank you. There’s usually a switch in your attic, closet, or crawl space … This will be a 2 pole (double switch) breaker and rated 208/230 volt. I'm glad it worked out and thank you again! Many times, the fuse size and type (typically a "TR" type) are written right on the fuse itself. Then inside fan seemed like it started running slower & seems to cycle to much ( 7 mins. If more amps than the air conditioner can handle try to reach the unit, the fuse will blow to protect the condenser. The indoor fan has nothing to do with the indoor fan, but if the outdoor fan is running, then the fuses are not the problem. Is this usual I just had my unit installed 3 years ago by a licensed HVAC tech. Perfect timing too, since it's summer when you need ACs. It sounds like it may be the issue you're having. MRCOOL. Just pop the fuses back in where you found them and turn everything back on before you sweat to death! Different Types of A/C Fuses However, many disconnects have fuses in the handle itself so you will have to pull the "T" handle out to find the fuses on this type. Replaced capacitor. If any breakers have been tripped, flip them to “off” and then “on”. I hope this has resolved your air conditioning problem. An AC person probably would charge a hundred dollars or more, without the owner's knowledge that only the fuses may need replacing after a break down. Always start simple... mine is humming and I tried pushing the fan blades but nothing happened.. What else could it be. Wonderful article! It's almost like the air conditioner knows how much we need it and breaks down on the hottest days of the year.". Question: How do you determine the size of the fuse if someone stole them and you have no idea what the rating was? If not, the new or old company wouldn't probably cover anything anymore as far as labor is concerned. Actually a great lesson. dedra - That's a very broad question however I'm thinking either the breaker tripped or fuses are blown. Voted up and up, and shared! Not sure what kind of system we have. do I need a separate breaker for central air ? Buy new fuse of the same capacity. Is a safety (device) that tells the HVAC unit, ok - you supposed to draw 30 Amp. Question: The fuses I pulled out of my air conditioner say HAC-R-35. Passenger Compartment We offer a full range of heating and cooling services including 24/7 emergency repair service. Pull out … This will be a 2 pole (double switch) breaker and rated 208/230 volt. A loose connection, a failed capacitor, or a short in the wiring could be responsible. Loose wire, short or electrical component failure. Question: Can I bypass the fuse boxes to run my AC? Going to share this. For … Generally a two-pole, 30 amp fuse is used for central air conditioners, but it is always recommended to check first. Here, you can see the door of the disconnect is open and the cover is being removed to expose the wires. Probably the capaciter. Just doesn't seem to blow strong enough. Answer: There are a few high-end systems that may have a 3 AMP fuse in the outside unit but typically, no. But all I can find to purchase are FRN-R-35. Question: My outside unit is running fine, but the fan inside won't start. Question: I have a blown fuse on my AC. Answer: The answer is yes, but I cannot in good conscious tell you how because it's a bad idea and fuses are so cheap, so why risk it? Thanks for reading my hubs and I hope they are helpful to you when needed. I just plain couldn't afford a tech and I have been without air for a month. Kind of cool, eh? Vote up for useful! Answer: Yes. It's possible that your fuses are in the same location as the wiring, fully exposed. Ric - Maybe check out this article. Kathy - I've just commented back on your other post and am glad it worked out. Answer: That would be impossible. There are only fuses in the disconnect (if a fused disconnect) at the condenser, but they are much higher rated than 3 amps. Why Is the A/C Humming With the Power Off? Replace the fuse as soon as possible. Question: Where is the 3 amp fuse located in a Tempstar 2-ton unit? ... the fuse will be in plain sight.or in small control box....be safe Shut all 240 volt breakers down and leave the main on if not sure where your ac breakers are at. Beyond that, it's possible the board was fried at the outage. What could be the problem? What should we check next? Replace the Air Filters. An air conditioner fuse prevents any parts of HVAC to overload or overheat. Sorry I can't do more at the moment but thank you for reading. Question: We had a severe lightning storm that damages our new A/C unit and furnace. Sometimes a surge can happen with an outage or "brown" power that can damage circuits. Power Issues. Do not put any fuse that is rated for a higher amperage and typically only a “TR” type fuse will fit. Oh change the fuses and the fan is not spinning still what could that be. Simply shut down the breaker to the A/C and turn the thermostat to "off.". The outdoor repair would've had nothing to do with the indoor fan however and on hotter days you should expect your cycles to be more frequent. Wow, you sure are a handyman! If it blew then there was some sort of surge which isn't uncommon and the reason fuses are there. There is very little air circulation to cool these components, increasing their chance of failure. We have circulation throughout the house, but the AC unit itself won't come on outside and fan doesn't turn. Nissan Note (2004 – 2013) – fuse box diagram. We cannot test fuses and voltage with the power off or the fuses removed. What should you do when your unit does not have fuses? for pricing and availability. Question: If the fan on the outside and inside AC unit both come on, then can the fuses be ruled out as the issue? Although the air conditioner doesn't have the ability to "know" anything, you're right; your A/C is more likely to break down on the hottest days of the year. The circuit breaker in the panel was 30A. The fact that you have no power to the stat means either your batteries have died or you have no power coming from the furnace to the stat or the power wire has come loose. If this fuse gets blown, you will need to have a professional replace it.