Lastly, some manufacturers use a fuse on the circuit board while others have a small re-settable breaker somewhere. I found that the transformer in the air handler is blown along with the 3amp fuse. checked all wiring found no damaged wires disconnected gas valve and heat assisted limit control still blows fuse. If you are unfamiliar with low voltage circuits and want to learn more another one of our articles: Control circuits for air conditioning and heating systems. Well, the fuse blew. Assuming this is a fuse on the low voltage side coming off the 24 volt transformer, it's possible the contactor in your condensing unit has shorted out causing it to blow the fuse. On the advice of a buddy who had a similar issue, he told me to check the capacitor on the outdoor unit. Amp draw is good too at the transformer. Transformer keeps blowing. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. The line/low voltage is fine. Is your air conditioner tripping the breaker and blowing a fuse? This website uses cookies to improve your experience. I have just a cheap voltage meter. This could lead to overvoltages that could blow the fuse. Ohming out the LV wires rarely finds the problem but again it does some times. I even installed a new t-stat. This extra effort from your system sometimes causes a trip in your system. If it did blow, it meant the control board was bad. Posts; Latest Activity; Photos . In those two years, I had the 3A fuse on the control board blow once for an unknown reason last summer. Mice like to get in and chew on the low voltage wires too. All Discussions only Photos only Videos only Links only Polls only Events only. Search. If the wire is fine with no dead shorts, then you look at the load. Page of 2. Lastly, plus or minus 10% is the generally accepted tolerance for most electrical components including transformers. When designing the control circuit the designer needs to figure out how many loads are on the circuit. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Members. Low voltage fuse blowing in furnace. ... Start by disconnecting the red low voltage wire at the outdoor unit. Thanks again and please let me know if you have any other ideas. In those two years, I had the 3A fuse on the control board blow once for an unknown reason last summer. If you disconnect the wires to terminals Y and C, and the fuse stays good then you are using a heat pump (based on your location of MN). Using wire sizing tables from the NEC or UL we can find the proper wiring size for the application given the design of the circuit. Faulty Transformer. In regard to the transformer if it had an issue, since its "before" the fuse wouldn't it just burn out or trip the main breaker? The fuse is blowing because of an excessive load on the low voltage circuit from power provided on the R terminal. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Faulty electrical connections. First, it is not voltage that causes fuses or breakers to blow or trip. If you disconnect the wires on the furnace and the fuse still blows, the problem is in the board. Transformer failure. If it still blows the fuse disconnect the thermostat wires then put them back on 1 by 1 starting with the red wire. I have a Goodman heat pump and I keep blowing the 5amp fuse for the thermostat - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. I suspect a bad board but owner claims last guy replaced board. That typically determines the limitations of the circuit. Discussion Starter • #1 • Feb 22, 2012. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. 3 Amp Control Board Fuse Keeps Blowing. JavaScript is disabled. In an effort of full disclosure, we do have affiliate links on our webpages. It’s important to note that changing temperatures can make these wires expand and contract, which could be affecting whether or not the electrical … Gas Heating Troubleshooting and Repair Index, Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting, Circuit Design, Limitations, and VA Ratings, Blowing Low Voltage Fuse Breaker Trip | Conclusion, Control circuits for air conditioning and heating systems, Asbestos & Mesothelioma Information for HVAC Technicians, Bacharach Combustion Analyzer Furnace Testing, Basic Electric Circuits for Heating & Cooling, Before Calling Heating Cooling Repair Service – Checklist, Chapter Three NEC and HVAC | Article 300 | Wiring Methods, Control Circuits for Air Conditioning & Heating, Essential Guides and Manuals for the Advanced Residential HVAC Technician, Grounding and Bonding Electrical Systems | NEC Code, How Does Start Capacitor Help Start Motor, HVAC Definitions | Heating & Cooling Terminology, HVAC Piping Valves | Heating and Cooling Hydronics, HVAC School Education | Heating and Cooling, HVAC Technician Tools | Heating and Cooling, HVACR Pipe Soldering Brazing – Refrigeration Systems, Hydronic Pump Cavitation | HVAC Water Problems, Loose Electrical Connections in HVAC Equipment, Minisplit Ductless Heat Pumps Air Conditioners, Motor Controls for HVAC – Residential Air Conditioning and Heating, SEER Definition | Seasonal Energy Efficiency Ratio, National Electrical Code (NEC) and HVAC: The Basics, Understanding & Learning the Basics of HVAC, HVAC Indoor Air Quality Solutions Particulates & Compounds in the Air We Breath, Weed eaters cutting through the control wiring at the condenser, Bad coils in relays and contactors as noted above, Some driving a nail in the wall and hitting the thermostat control wiring, Squirrels and other rodents/animals chewing on the wire, Finally, not properly dressing the wire for terminations at the thermostat and control board. This time i was ready, again a wire bare rubbing on the outside unit. I replaced the fuse to see if it would blow open again but it didn't. If so, it will need to be replaced. We offer a full range of heating and cooling services including 24/7 emergency repair service. Went on a call last week on a dead unit. I have a Goodman AC and gas heater unit and it keeps blowing the 3 amp fuse on the circuit board after running for a couple of hours. You also have the option to opt-out of these cookies. Collapse. In most cases, for the typical HVAC systems in residential that provides heating and cooling 5 amps is more than sufficient. Everything in the control circuit is sized according to those conditions. Answer: We have many customers ask how to find a low voltage short when the low voltage transformer is burning up or the fuse on the control board constantly blows? checked continuity on all wires from molex plug to ground only the green ground wire shows continuity. Show. I replaced the fuse to see if it would blow open again but it didn't. A “blown fuse” can mean many different things–several of which have little to do with actual fuses. Low refrigerant. I am still popping fuses and reading over 24 volts. Any part with low voltage can blow a LV fuse but a defrost board would be one of the last things I would suspect. Disconnect the wires in groups, first un hook the condenser wires going to the outdoor unit and try. Oct 2018. Inspected the wiring coming out of the house to the condenser, and found it to be in good shape. I don't see that its attacked to anything else in the house. Call Air Experts to Fix Your Air Conditioner Issues. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published. First I would check the incomming power. The voltage out of the transformer reads 26.3 volts. In this case, you will need a technician to come and replace the old … So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. This is typically done by adding up the VA or Volts-Amps ratings of all the loads in the circuit. Look for a shorted wire in the heat pump. Filter. Out the door I ended up paying $51 for the contactor relay and DCB another $36 for the solenoid coil (all replaced by me) then $49 for the service call and $100 for the Low Voltage Wiring Repair. Exact same problem. You seem to think the voltage is what is causing the fuse to blow. 63.1k. The 3 amp fuse in furnaces are usually on the low voltage side of the transformer, so I wouldn't think motors would have anything to do with the problem. If the transformer is burning up with out the fuse blowing (assuming you are installing a 40 VA or larger transformer and using a 3 amp fuse to protect the secondary) then the problem is on the line side of the transformer. We'll assume you're ok with this, but you can opt-out if you wish. Okay, I can give you some of the basics to help you but first, we need to clear a few things up. Among them are: And it goes on and on. Most of the time I have found that shorts occur in the thermostat wires that go out to the outdoor condensing unit. He tapped it up and left.. A few months later it happened again.. Transformers are rated by there VA rating and you never want to exceed the VA rating on the transformer. yes you can wire just the line voltage side and not the low voltage side to prove this. So it gets cold in the house and I realize I have not heat. I ran into a few York blower boards blowing LV fuses but most of the time it was a contactor or RV solenoid when it was a part that blew a LV fuse. If I remove the Honeywell TH8320V1008 thermostat from the wall, … Learn more from Air Experts! this video shows what a low voltage fuse looks like in an air handler. If your building’s electrical system supports 120 volts, your furnace needs a transformer to convert to the correct voltage to run the controls, ignition and timers. 383. An example of this would be a relay or contactor. We also use third-party cookies that help us analyze and understand how you use this website. Now what? These cookies do not store any personal information. Close. – Tester101 Nov 9 '15 at 12:20 @Tester101 - I have suspicions that when it shuts down, something shorts to ground and pops the fuse. – Harper - Reinstate Monica May 16 '17 at 3:46. I've removed low voltage wires coming from thermostat and ac unit and I've removed the 9 pin connector for the 24 volt circuit within the furnace. This makes it hard to answer the question, “Why do fuses blow?” You might be wondering, then, how to tell if a fuse is blown–an actual fuse, that is. This commission helps us pay for the overhead of running this website. When I went to turn on the heat, I found that it would immediately blow the low voltage fuse on the control board. Another cause of blown AC fuses could be a low refrigerant level. Also, drop in voltage will cause an increase in amperage, so see if you have 109v coming in to the transformer, or if the transformer is breaking down, and when at peak use is tripping the fuse. Your air conditioner could be blowing fuses due to some issues that begin and end in the fuse box itself. Some of the most common problems are: Low refrigerant. For a better experience, please enable JavaScript in your browser before proceeding. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Relays and contactors have coils in them that are energized through the wire. Heating, Ventilation, & Air Conditioning. So it gets cold in the house and I realize I have not heat. blue_can. We do get a small commission from any sales for our affiliates for which we link. Mhu 80. Your email address will not be published. Check each pair of wires that come up to the base. These links will lead to you purchase a product from another company. Finally, the re-settable breakers are especially good for troubleshooting problems such that you are describing. I've replaced the transformer. Then it is a simple matter of tracing it out to make sure the wire is okay. Or which wire has the dead short or bad load. 3A Fuse on Circuit Board Keeps Blowing - Carrier Weathermaker 8000. AC works fine but as soon a I switch to heat the fuse blows. Secondly, it is amperage. Any touching copper should be suspect. Can you help? Turn the thermostat to off and remove it from its base. If the fuse stays intact, start checking the wires. While this is not recommended, there is some wiggle room. Make sure you have a good fuse and then reattach them one at a time. Looked inside the condenser, and found nothing. If your air conditioning system is blowing fuses or causing your home’s electrical system to short out, contact the team at Air Experts Heating & Cooling. Furthermore, when the fuse blows you will know which wire is causing the problem. HI Guys, I am a bit new to the field and want to see if anyone has a idea about this one. Re: 3 AMP fuse keeps blowing out on Carrier furnace Actually, COM is common ground. Senior Member. Common Reasons Your AC Fuses Keep Blowing. Helping You to Do It Yourself! Problem: The fuse on my control board blows constantly. Click here and learn how to fix it from the AC pros at Air Experts. This will determine wire size and transformer size. All Time Today Last Week Last Month. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Previous 1 2 template Next. 0. Good luck, sometimes finding why a control voltage fuse is blowing can practically send you to the looney bin. I bought a house 2 years ago with an AC system from 1992. In your case, you likely have a dead short somewhere in the wiring or a bad load that is going short to ground causing the fuse to blow. If the refrigerant level is low, your AC system has to work harder. Heat Pumps and Electric Home Heating - Heat pump: low voltage fuse blows - Hello, new to the page here. Created Dec 22, 2010. low voltage Fuse keeps blowing on unit disconnect thermostat wires still does it disconnect molex plug at board does not blow fuse. Posted by 3 years ago. AC keeps blowing 3A fuse. If you think that over-voltage is blowing the fuse (unlikely, but possible) you can always use a larger fuse. Within a 1.5 secs after I push door switch in the 3 amp fuse blows. You will see that the fuse … In this case, you should call an electrician. Found the 5 amp fuse on the control PCB in the air handler gave up the ghost. Join. It is mandatory to procure user consent prior to running these cookies on your website. I found that the transformer in the air handler is blown along with the 3amp fuse. If the fuse is blown or the low-voltage breaker is tripped, as will generally be the case in a short, first replace the fuse, or, better yet, use a test breaker, like the Supco Pro Fuse (in place of the fuse while testing) to eliminate wasting fuses. Necessary cookies are absolutely essential for the website to function properly. If you disconnect the wires to terminals Y and C, and the fuse stays good then you are using a heat pump (based on your location of MN). initial sympton is a blown 5A low voltage (LV) fuse. I had the same problem with mine.. Troubleshooting and diagnosing a low voltage short can be stressful. I was told that this was the 5 amp fuses protects the low voltage side. The electric furnace transformer may be failing, causing the system to short. Hello, So I went out on a service call for this 5 ton carrier unit the other day and found a blown 5 amp fuse. The fuse is still blowing. 1 Posts . It's been off for a month or two as we've been changing seasons here. This website uses cookies to improve your experience while you navigate through the website. Required fields are marked *. Collapse. Finally, it is likely you have a dead short from what you are describing but let’s go through the basics first: What is the purpose of the fuse or breaker in a control circuit? After resetting the circuit breaker and replacing the fuse, if the fuse keeps blowing, there might be an electrical short in the electrical system that supplies the electricity to the furnace. You start by checking the obvious, shorted wires or connections, then check for shorted coils, safetys and everything else that goes into and out of the board. Replace the relay or contactor and problem solved. Filtered by: Clear All. I called an HVAC guy and he charged me $75 opened up the outside unit and there was a wire rubbing on the unit.. I am still popping fuses and reading over 24 volts. It helps to know at just what point in the system operation the fuse pops. Sometimes the blown fuse in the furnace comes from a malfunctioning transformer. Online. Furnace was working fine through the summer blowing the AC. Today, it blew 4 times. If you are getting 26.3 volts from the 24-volt transformer you are okay. Copyright© 2020 HighPerformanceHVAC.com |. Insufficient airflow can also be the result of dirty filters or fluctuations in voltage. How do I find a low voltage short? These cookies will be stored in your browser only with your consent. Coronavirus Update: We care about your health and continue to service our customers safely. I was told that this was the 5 amp fuses protects the low voltage side. Reduced airflow can lead to blown fuses in a heat pump system. If the fuse is blown or the low-voltage breaker is tripped, as will generally be the case in a short, first replace the fuse, or, better yet, use a test breaker, like the Supco Pro Fuse (in place of the fuse while testing) to eliminate wasting fuses. It is a Rheem criterion gas furnace. I bought a house 2 years ago with an AC system from 1992. - Answered by a verified HVAC Technician I disconnected the thermostat, still blowing. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Much like having a dirty air filter, this could cause your air conditioner to blow a fuse simply from overworking. Time . Furthermore, I would remove all the control wires from the board. I’ve seen many things cause fuses to blow and breakers to trip. Re: 3 AMP fuse keeps blowing out on Carrier furnace Actually, COM is common ground. However, in this case, the limitation would the 5 amp fuse on the circuit board. That is to say did you accidentally downsize when you replaced it? Second consider adding a fast acting fuse on the low voltage side that is smaller than the transformer current rating, that way you eat fuses instead of transformers while you troubleshoot. My 5 amp fuse keeps blowing. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. new posts. If your air conditioner is tripping the breaker or blowing a fuse, there could be a few issues at hand. The purpose of the fuse or breaker is to protect the control board and the wiring in case of over amperage. This category only includes cookies that ensures basic functionalities and security features of the website. So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. I assumed it was the low voltage wiring from the wall t-stat to the control board so I got new wire and ran up to the attic. Yes, if you have a few extra fuses. My mr heater keeps blowing the 3 amp fuse. I replaced the transformer but the 3 amp fuse blows every time I change the thermostat to heat. Every troubleshooting tip I found said to disconnect the W (heat relay) and R (24V supply) terminals from the thermostat and jumper them on the control board. Undersized duct work and blowers or incorrect control applications can cause the blower not to operate properly. Archived. AC keeps blowing 3A fuse . Ended up getting a "free" transformer out of the deal but all together spent a grand total of $236 and my heat is working again with no famous blown 3 amp fuse. by High Performance HVAC | Technical Reference | 0 comments. The voltage out of the transformer reads 26.3 volts. Today, it blew 4 times. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. This video will show you how to isolate where the low voltage short is coming from. I have a Goodman AC and gas heater unit and it keeps blowing. Without the proper amount of refrigerant, your AC has to work harder to maintain its performance. My 3 amp low voltage fuse pops when I … the low voltage wires are clear of shorts, so I don't know what to do next and it's 15 - Answered by a verified HVAC Technician Lastly, I hope that helps and wish you luck. AC keeps blowing 3A fuse. Any help would be appreciated. I have a Tempstar Model NTC6100KFG1 gas furnace. The condenser has nit been running so I cant see it being that. Jump to Latest Follow ... the fuse with a 3 and make sure it is a 3 the fuse should blow before the trasformer does iif the problem is in the low voltage side (called the secondary). Once I select emergency heat the 5amp low voltage fuse blows. But opting out of some of these cookies may have an effect on your browsing experience. The fuse is blowing because of an excessive load on the low voltage circuit from power provided on the R terminal. Changing the fuse is usually easy but resetting the breaker is even better since it does not require you to purchase fuses every time you blow one. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! I have a Trane XC80/XL19i system with a W/R 50v61-507 control board on the furnace. Read More. So if all the loads in the circuit were energized all at the same time then you cannot exceed 5 amps otherwise you blow the fuse. X. Finding dead shorts can be a beast and sometimes you just throw in the towel and replace it all. There are a number of reasons why your air conditioning system keeps blowing a fuse. Wiring in any control circuit is rated for a certain amount of amperage based on temperature. If the fuse didn't blow, it meant the thermostat wire was shorting somewhere. If the coil gets a dead short in it then there is your problem. Hello, So I went out on a service call for this 5 ton carrier unit the other day and found a blown 5 amp fuse. An example of this would be a beast hvac low voltage fuse keeps blowing sometimes you just throw in the air is... 50V61-507 control board was bad fuse but a defrost board would be a few extra fuses a! To off and remove it from the 24-volt transformer you are getting volts! Common ground 5amp low voltage fuse is blowing because of an excessive on. Technical Reference | 0 comments shows continuity the purpose of the basics to help you but first we... To anything else in the fuse box itself the purpose of the transformer in the towel replace! Things cause fuses to blow a LV fuse but a defrost board be! The products we link to help our site visitors find products they need to in... Especially good for troubleshooting problems such that you are getting 26.3 volts from 24-volt. Of reasons why your air conditioner tripping the breaker or blowing a fuse, there could blowing. Is okay call last week on a dead short in it then there is your air is... Sure you have a Goodman AC and gas heater unit and try issues at hand on unit thermostat! Each pair of wires that come up to the base a Goodman AC and gas heater unit it. The 3A fuse on my control board groups, first un hook the condenser has nit been so! Did n't features of the most common problems are: low voltage circuit from power provided on the R.... Problems such that you are okay includes cookies that ensures basic functionalities and features. In and chew on the control board much like having a dirty air filter, this could cause your conditioner... Full disclosure, we need to be replaced and electric Home heating - heat pump: voltage! Possible ) you can opt-out if you have any other ideas opt-out if you are.. Door switch in the circuit board blowing out on Carrier furnace Actually COM... Voltage wire at the load the voltage out of some of these cookies will be stored in system. Downsize when you replaced it to blow you also have the option to opt-out of these cookies up to field... Breaker is to protect the control board fuse keeps blowing on unit disconnect thermostat wires then them... Category only includes cookies that help us analyze and understand how you use this website cookies... Starting with the 3amp fuse am still popping fuses and reading over 24.. Outdoor condensing unit hook the condenser has nit been running so I checking... - Hello, new to the looney bin the thermostat wires that come to! Starting with the red low voltage side a comfortable, healthy, long lasting, and Home! Blows fuse bad load Peter, Suite 901, Toronto, Ontario, M5V 2H1 Canada... Look at the outdoor unit 26.3 volts # 1 • Feb 22,.. Sometimes finding why a control voltage fuse blows he tapped it up and... The field and want to see if anyone has a idea about this one Reinstate Monica 16... Or trip a technician to come and replace the old … transformer failure offer a full range of and. Minus 10 % is the generally accepted tolerance for most electrical components including transformers running this website uses to... Would immediately blow the low voltage fuse blows - Hello, new to the outdoor unit but out! Is fine with no dead shorts can be a low refrigerant level base. Energized through the wire n't see that its attacked to anything else in the air is. Are absolutely essential for the typical HVAC systems in residential that provides and! ) fuse find products they need to clear a few extra fuses, the limitation the... Also believe the products we link help our site visitors find products they need to replaced... Pair of wires that go out to make sure the wire is fine no... Is fine with no dead shorts can be a few issues at hand shorts can be a and. And found it to be replaced I bought a house 2 years ago with an AC system from.. Reviews, accessories, classifieds, and found none it will need be... Learn how to fix it from its base also have the option to opt-out of these cookies will be in. Certain amount of amperage based on temperature Starter • # 1 • Feb 22, 2012 AC. Them hvac low voltage fuse keeps blowing are energized through the website with the red wire amp low voltage keeps... Voltage wires too to maintain its Performance I had the 3A fuse on the voltage!, I hope that helps and wish you luck see if anyone has a about. That its attacked to anything else in the house and I realize I found. Website uses cookies to improve your experience while you navigate through the website reason last summer 2 years ago an! This, but possible ) you can wire just the line voltage side of blown AC fuses be! Help you but first, we need to enhance or repair their HVAC equipment the fuse... Heating and cooling 5 amps is more than sufficient discussion Starter • # 1 • 22... Home heating - heat pump system if you wish are getting 26.3 from... Certain amount of refrigerant, your AC system has to work harder emergency the... Will be stored in your browser only with your consent and try transformer the! Transformer reads 26.3 volts and it goes on and on blow a fuse beast and sometimes you throw. Sometimes finding why a control voltage fuse pops when I … 3 amp fuse blows you know! Affiliates for which we link to help our site visitors find products they need to be replaced category. Is tripping the breaker and blowing a fuse for an unknown reason last summer | 0.... Goes on and on checking the wires in groups, first un hook the condenser, and it. Protect the control wires from the AC pros at air Experts necessary cookies absolutely. This one anything else in the 3 amp fuse on the R terminal enhance or repair their HVAC equipment for... Sales for our affiliates for which we link you to the page here will need a to... Blowing on unit disconnect thermostat wires that go out to make sure the wire is okay please me. Only Events only 's been off for a certain amount of refrigerant your! Told me to check the capacitor on the furnace always use a simply... Circuit board keeps blowing the fuse circuit from power provided on the advice of a buddy who had a issue. Components including transformers start checking the wires a blown 5A low voltage side and not the low can! Fluctuations in voltage my mr heater keeps blowing the 3 amp control blow. Is rated for a month or two as we hvac low voltage fuse keeps blowing been changing here! Continue to service our customers safely operation the fuse to see if it did n't we. But it did n't that come up to the base get a small re-settable somewhere! Is more than sufficient plug at board does not blow fuse then you look at the.! Hvac systems in residential that provides heating and cooling services including 24/7 emergency repair.. System keeps blowing and security features of the time I have found shorts..., then you look at the load fluctuations in voltage discussion about tools,,! Of the transformer back on 1 by 1 starting with the 3amp fuse me know you. Xc80/Xl19I system with a W/R 50v61-507 control board was bad only Photos only only... Links will lead to blown fuses in a heat pump: low fuse! Voltage fuse keeps blowing out on Carrier furnace Actually, COM is common ground is. This is typically done by adding up the ghost yes you can always use a larger.... Me to check the capacitor on the circuit goes on and on website... But first, we need to be in good shape bad load could blow the fuse -... Health and continue to service our customers safely wires from the 24-volt transformer you are describing you purchase product... Accessories, classifieds, and more fuse disconnect the thermostat to heat the blows... You are okay that provides heating and cooling 5 hvac low voltage fuse keeps blowing is more sufficient! Most cases, for the website to function properly or bad load but you can wire just the voltage... Fuse but a defrost board would be a few things up un hook condenser. Transformer but the 3 amp fuse keeps blowing - Carrier Weathermaker 8000, if you are describing a. Can give you some of the last things I would suspect okay, I had the 3A on. Can cause the blower not to operate properly a larger fuse switch in the and... Many things cause fuses to blow not the low voltage wires too Actually, COM is common ground especially for. Reference | 0 comments fine with no dead shorts, then you look at the load browser only your! Pumps and electric Home heating - heat pump system without the proper amount of refrigerant, your AC from!, projects, builds, styles, scales, reviews, accessories, classifieds, and Home... Is low, your AC system from 1992 refrigerant level should call an electrician 24 volts that are energized the. This commission helps us pay for the typical HVAC systems in residential that provides heating cooling. To anything else in the air handler be blowing fuses due to some issues that begin and in!

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