Ac Contactor Won T Stay Closed

The air in your home won't be as dry, so you stay comfortable at a lower temperature setting. At Bill Joplin’s Air Conditioning & Heating, we focus on providing for the air conditioning needs for both residential and commercial customers throughout the McKinney, TX, area. any other ideas? what's interesting is that i saw the fan in my AC unit turn a little bit when i set the AC on but i'm not sure if it was just the wind it made approximately half to one very slow rotation. This NEMA receptacle chart provides technical drawings and specifications for NEMA locking plugs, receptacles, inlets, outlets, connectors and cords. The coil voltage on the contactor should be between 24 to 28 volts AC and you should get 24 to 28 volts AC between terminals Y and C when the thermostat calls for cooling. This circuit will also help it to stay cooler. In most cases, you have the choice of OEM parts or lower cost high-quality universal replacements. It struck me as very filmable, ready to scare the pants off people in dark. (this was yesterday) Today[U][U the heat index is 101 degrees and NO AC!. Physically, it is located in the contactor. Sanford AC Installation. AC unit won't stay running. After the overload has cooled it can. Incorrect engine oil. Just bring toilet paper. In the movie "Anna, a fearless optimist, sets off on an epic journey - teaming up with rugged … Continued. Therefore, motor troubleshooting involves the entire system, not just the. I have no idea if that is a large amount of farads. I can manually push the contact in and hold it and ac works. Consumer Reports offers up these troubleshooting tips, saying poor maintenance can result in an AC that doesn't work well. replacement parts for furnaces, air conditioning and air handlers manufactured by goodman Goodman products, including the GMC and Janitrol brands are made with the best components available. If the element was on with no airflow, then it may be toasted. It was a vast improvement over the factory start capacitor, but still not the correct choice. If it shows closed and there is no voltage on the coil, then the contacts are stuck. Improper type of oil. Replace Contactor. His circuit involves feeding the relay load output through a transistor and back to the relay coil to maintain current on the relay coil when the switch is released. Our accommodations. Proactive maintenance emphasizes the routine detection and correction of root cause conditions that would otherwise lead to equipment failure. I have tested my power in and out of the contactor and it seems to have normal power in and out of the contactor. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Outdoor unit won't shut off unless I use the circuit breaker: This happens occasionally. I'm still getting E3 code after changing out board and motor. If you notice visible leaks from your HVAC unit or an accumulated puddle, then you have a problem. The owner of this website, www. Refer to foldout 1. Called back out same problem. Personally, we would not do this ourselves and would instead use a qualified service facility with expertise in AC units and systems. Anything stuck in the contactor can cause the outdoor A/C unit to stay on even when you turn it off at the thermostat. I just paid $165 for the AC repair this morning. NSW Department of Education | education. If the AC won't run, or won't stop running, a broken or dirty contactor may be the reason. Since we are asked this question so often though, we do have a few good answers ready to go. Low engine temperature. The defrost timer eventually switches into defrost mode and supplies power to the defrost heater(s) to melt any frost that has accumulated on the evaporator (cooling) coil. Discovered an overheated and burned lug on the outside ac disconnec. Bay Area Plumbing & Heating delivers exceptional plumbing, heating and air conditioning services. I've been working on a Carrier RTU Model 50hjq014. Try replacing the fuse or flipping the circuit breaker to the closed position. But at Foss Heating and Cooling, we’re obsessed with it! We want to share with you some things that you may not have known about your air conditioner (AC). This is not uncommon. Pressure Switch: When your spa filter, or suction intakes, or return jets are clogged, blocked or obstructed, the pressure switch will stay closed and keep the heater from working. Fault Condition: Spa will not heat to maximum temperature of 104°F. My Central Air Conditioner Won’t Turn On; What Should I Do? As it starts to get warmer and you turn on your air conditioner for the first time this season, what do you do if it doesn’t turn on? Follow these four east trouble shooting steps as possibly save an unnecessary service call for central air repair. Contactors are cheap and can be ordered off Amazon. Air conditioning isn’t exactly a stimulating topic to bring up at parties. Over time, exposure to air and moisture can cause a buildup of rust layers and corrosion causing different segments of pipe to adhere. I missed something in my earlier reply - you've got a 330 a/bp! That machine has *no* pre-flow at all. I just paid $165 for the AC repair this morning. Motors have a long useful life, but they do seize up or burn out in time. switching-1-pole-contactor-to-2-on-ac-unit I have read thru some old threads on this subject, and really want to be sure what I need to do. Turbo housing hose leaks. Report comment. This arc will be greater at DC potentials rather than AC. It's time to have your air conditioning system thoroughly inspected by the pros before you have a serious AC failure on your hands. Use a mechanical relay. I can unplug everything and turn off everything, even the power to my room and they will stay sticking for awhile. You won't see any noticeable shortened life of the motor. If the contactors contacts do not pull in or close (completing the high voltage circuit) voltage will not pass thru to the compressor. Physical Barriers. I am writing AC down as a. Close door and use manual release rope and handle to disconnect trolley. For example, an air conditioning unit could be leaking because of torn insulation foam on the refrigerant feeding line. If you see that you have good water flow and your heater will not operate, check to see that the thermostat makes a "click" noise. This doesn't really change the overall message of the article (Check the Obvious) but it sort of muddies the water for me on the correct use (if it exists) of AC and "heat pump". Motors have a long useful life, but they do seize up or burn out in time. Sanford AC Installation. • How much will it cost to replace my old air conditioning system? • What is the difference between the SEER and EER rating of an air conditioner? • Should I move the air conditioner into the attic? • My air conditioner outside unit (condenser) won't start and is making a humming noise. When the contactor is damaged and needs replacement, it won't pull closed and connect the two ends even when you run a current directly to it, states HVAC Tech Support. While the superheat at the evaporator is typically 6F to 8F in refrigeration systems and 10F to 12F in air conditioning systems, the superheat measured at the compressor should be no lower than 20F, allowing for part load operation. If something is causing your element to malfunction, the hot tub breaker will trip. What is the difference between electrically held and mechanically held lighting contactors? Schneider Electric USA Website. In the case of a Heat Pump 24 volt power is applied to these side. We often use the questions we get in the email as a guide to write articles. Therefore, motor troubleshooting involves the entire system, not just the. Improper type of oil. How To Make Stubborn Electric Range Element Sit Flat Down Stay Level Stop Popping Up Plus Proof Case Closed Diagnosis Bad Contactor An Air Conditioner That. Discovered an overheated and burned lug on the outside ac disconnec. A new system should not require a reset to continue cooling. If you notice visible leaks from your HVAC unit or an accumulated puddle, then you have a problem. The next time your gas furnace stops pumping out the heat, use this handy checklist to do some furnace troubleshooting on your own—before calling in the pros. 15 things your lifeguard won't tell you. Checked for loose wiring, bad ground (contactor 120v coil), pressure switches. If it is, the unit won't come on in cooling mode. 2 of the readings should add up the 3rd so for example the 3 measurements you might get are 6 ohms, 5 ohms and 1 ohm, This is therefore OK as measurements 2 & 3 add up to the first. Covers AC that isn't working at all, isn't cooling properly, isn't blowing air, is leaking, and similar AC problems. While holding the rear hatch handle in open position (lift handle up) - use screw driver to lightly push the lock mechanism down (not up). Need help choosing kitchen cabinet brand and contactor- Ctrl NJ the KD's won't give. There are 5 Pins in a relay. Keeping AC on while passenger waits in car. I bought a multimeter and I am showing 24V coming out of the transformer and into the unit outside. As mentioned here, the Crydom solid state relay was stuck closed. To review these factors, please go to our HomeOwner Insurance Coverage page. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. My central heat/air conditioner is Trane (XL80 for the furnace and XE 1200 for the condenser/compressor) and the part that I will troubleshoot is the condenser unit that is located outside. The good news is that the result was an "R" error, so at least it's not a silent failure. So what’s the problem? Well, if your outdoor unit clicks but won’t start, the problem is most likely either a failed capacitor or a failed contactor. I have a Trane XL19i condenser. When the contactor is damaged and needs replacement, it won't pull closed and connect the two ends even when you run a current directly to it, states HVAC Tech Support. We won’t leave unless all questions are answered and the work completely done. Opener hums briefly, then won't work:. How does one test the starting capacitor in an RV's AC unit? I am able to get to the capacitor but didn't touch the thing out of fear. i just replaced the air handler and since this was done the condenser is tripping the breaker on start up. If you modify the contactor per the link that will not be a problem. Check the safeties. Biologist William K. Use an air conditioner or. What it is: Sometimes your nose just won't cut it. Close the deal on a new enclosure at Bay Power. From relays to contactors to electric motors and. I felt lucky to get an appointment for today. Turbo housing hose leaks. A properly balanced door will stay in any point of travel while being supported entirely by its springs. The positive (Blue wires) then goes into a red piece connected to the coils. This doesn't really change the overall message of the article (Check the Obvious) but it sort of muddies the water for me on the correct use (if it exists) of AC and "heat pump". In this article we. The circuit is a quite typical TRIAC based dimmer circuit with no fancy special features. WD-40® Multi-Use Product is great for disconnecting damaged, rusty pipes. This is not uncommon. The AC system or appliance has a LRA rating, which is the staring current required for that motor/compressor. Air Conditioner or Heat Pump Relay Control Switch Chattering A/C or Heat Pump Relay or Contactor Won't Pull-In - Won't Turn-On. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. This situation often develops when there's an uneven distribution of single-phase loads, either from a nearby panel or throughout the premises. 2) Static 3-Phase Converter. A more common problem that would cause this is a stuck sequencer, the element would be on 24/7, cycling off on high limit when the blower isn't running. Our accommodations. If the reason why the sealing circuit does not close is because of any physical barrier that isn't a safety feature, then simply remove it. The same is true when someone uses a "normal operation" motor contactor for motor jogging duty. Hi Even! You should have 24 to 28 volts AC on the coil of the contactor. This set of contacts is usually wired to keep the coil energized and thus the main contacts closed even after the Start/On button is released. The thermostat in your car is responsible for controlling the amount of coolant released into your engine. 95 air conditioning maintenance checkups by his four-year old Bruno Air Conditioning of SWFL. Hi George, When I was trying to find the answer on my own (before the post) I did read that you MAY be able to use a DC coil with AC voltage but not vice versa, that was a nother good article, if I can find it again it post it. One contactor may have several auxiliary contacts, either normally-open or normally-closed if required. Whether you’re trying to save money on AC repairs or just need to know you’re getting experienced service technicians, we remain the best choice for you each time. Don't worry about the time of day: we have 24-hour emergency service so you won't have to sweat it out too long with a busted AC. I have replace it, worked for about 4 hours then quit. \$\endgroup\$ - Ian I would stay clear of the Fuse. The fan on my Trane outside air conditioning unit is always running. If the thermostat, breakers and access panel doors check out, the blower motor itself may have failed. A new system should not require a reset to continue cooling. If you are experiencing an issue with your Trane system, our guide can help answer your questions. Arcing occurs when the contacts close too slowly or when the contacts are misaligned, causing electricity to jump from one contact to the other. This NEMA receptacle chart provides technical drawings and specifications for NEMA locking plugs, receptacles, inlets, outlets, connectors and cords. Stand next to your AC unit outside and have someone else turn the thermostat on and off. He then called a repairman who said it was a bad fan motor. Looking through google searches, I found 1 other with the same problem, they replaced the capacitor with no change at all. I have a new contactor on order for my A/C, but it won't be here til Monday. The multimeter I have came from harbor freight so I doubt it will test large capacitors like this. Our gas and electric Fleet cars will help your facility needs and our PTVs will handle anything at home. HV Pack Voltages & Grid Charging. In order to save power in a contactor when it is closed, an economizer circuit is also introduced. , a Diamond Certified company since 2004. Low engine temperature. The clutch won't stay. and Puerto Rico, UPS accepts non-bulk quantities of hazardous materials for transport by highway and rail, or air modes when prepared in accordance with the U. Keeping curtains drawn to block out the sun during the brightest hours of the day can also help reduce the need to use your air conditioning system. There are 5 Pins in a relay. There is difference in the amount of power that is required to close the contactor and that from keeping it closed. A contactor not being energized or closed can be caused by a host of reasons. com have joined forces! View Cart Check Out. Trees for You. When doing any remodeling work on a property we’ve taken back, we’ve always pulled our own building permits and then had our designated contractor do When doing any remodeling work on a property we’ve taken back, we’ve always pulled our own building permits and then had our designated contractor do. There is a manual pushbutton start for the motor, and when pressed the motor spins up to speed but stops as soon as the pushbutton is released. Checked for loose wiring, bad ground (contactor 120v coil), pressure switches. Once an air-conditioning system isn’t charged correctly it has a negative effect on the computer system. Possibly specifying a contactor with a normally closed aux contact instead of a normally open one or vice versa but this would be obvious with the contact numbering. it won't work. No control voltage or incorrect voltage present to energize the contactor coil , A. Always check the manual, just to be sure. Now, contactor won't engage unless pressed in manually. Physical Barriers. Although "across-the-line" motor control circuits are simple and inexpensive, they are not preferred for starting large motors. Here to help are the most common causes of short-cycling and ways they can be corrected. This motor is what turns the large fan blades that draw air over the condenser during operation. However, this misconnection won't destroy the contactor. Troubleshooting air conditioner issues is easy with American Standard Symptom Checker. Re: Troubleshooting an ac coil Magnetic Contactor, 07/30/2008 7:16 AM If the specs on the contactor are correct for the application and it is configured the same as others that are not burning out, the only cause of a contactor coil burning out would be an obstruction preventing the contactor armature from sealing in fully when it is energized. If your central air conditioning condenser problem is that the compressor and condenser fan won't run, first check the thermostat and be sure it's turned on to cool, and that the temperature setting is below the room temperature indicated on the thermostat. they won't current. On a contactor there are often two types of contacts, the main and the auxiliary. Very darned aggravating, indeed. The alternating current(AC) voltmeter on an A/M24T-8A indicates 120 VAC and the panel lights are working, but nothing happens when you turn the load selector switches on. 6 Potential Problems If You Ignore Air Filter Replacement Aug 27, 2014 | Articles Your air conditioner’s air filter isn’t just there to help keep the air that comes out clean. Once the motor is running, the time on the timer should expire, making the Contactor 3 switch off, and changeover to Contactor 2 (Contactor 1 will also stay energised). Proactive maintenance emphasizes the routine detection and correction of root cause conditions that would otherwise lead to equipment failure. You can cheat and unhook the 24v wires to the outside unit at the air handler board and turn the A/C on, if the air handler continues to run without the fuse blowing, it's most likely the wiring going to the condenser unit outside. The fan and compressor on your air conditioner or. Single Pole Contactor: I checked the single pole contactor for any insects, bugs or ants stuck in between the silver contacts but it seemed to be clean and working correctly. I've been working on a Carrier RTU Model 50hjq014. When your A/C system needs maintenance or repair, contact service experts at Gagne A/C today to stay cool (…or warm) in your home. Bad AC Contactor Symptoms. UPS accepts hazardous materials on a contract basis only, servicing the U. 2) Static 3-Phase Converter. Plugged oil filter. Should a grid overload occur the power company will active the load controller and open the wire from to the contactor so the compressor is powered off. It's not a heat pump. Physical Barriers. WD-40® Multi-Use Product is great for disconnecting damaged, rusty pipes. com, Amazon. CSLS Uses a Teaching Method You Won’t Find Elsewhere All of our study materials are based on the “Mizener Method,” which was developed by our founder and is the key to our home study materials, which have been used by tens of thousands of students. There are numerous reasons for a leak, depending on your season. A triac is another way to control AC with silent operation, though I won't go into any details as this project didn't use any. For example, an air conditioning unit could be leaking because of torn insulation foam on the refrigerant feeding line. Just this year, I have had issues with it not staying running. Bay Area Plumbing & Heating delivers exceptional plumbing, heating and air conditioning services. The air in your home won't be as dry, so you stay comfortable at a lower temperature setting. New DSC Series AC Speed Control Motors The DSC Series is a cost effective, high functioning and simple to use closed loop AC Speed Control system that offers easy to use speed control. Kung Fu Maintenance shows AC Relay Air Conditioner Contactor Not Pulling In Five Most Often Causes 1) Bad Thermostat 2) Bad Wiring 3) Bad Contactor 4) Bad Tr. Twice during start up I had the contactor stay closed and received 5 bars on the battery display along with a code 67-1. I believe my contactor may be broken. Incorrect wiring. 8 reviews of Wray's Air Conditioning "Techs are super kind and knowledgeable and will stick with you until the issue is figured out and fixed. On a contactor there are often two types of contacts, the main and the auxiliary. Alternating Current - AC: Electric current in which the direction of the flow is constantly being reversed back and forth. The good news is that the result was an "R" error, so at least it's not a silent failure. The auxiliary contact is often used in a relay logic circuit, or for some other part of the motor control scheme, typically switching 120 Volt AC power instead of the motor voltage. First, unit wouldn't shut off at all. These normally-open contactors require 24V power to stay closed. First it charges to full at standard mode and then 24 hours later it starts to balance the cells and it won't charge and you get the red ring. The AC Unit Is Old. For instance, if your hot water heater breaks and damages your floor, your policy will pay to fix the floor, but it won’t pay for a new hot water heater. Check for refrigerant pressure. Secondly, Take the 3 points of the compressor and measure between them. Short cycling is when the furnace will kick on for a few seconds, then shut off for a few seconds, then back on, then back off, repeat indefinitely. Original review: July 24, 2019. the switch on my gas fireplace won't work when i turn it on and the pilot light is on. I have a split York AC unit in my place here in Mexico. When you push the "ON" button, the contactor's coil is energized, causing the contacts in the contactor to close. Some split systems will have a transformer for the heating and a transformer for the air conditioning system. Don Harris 39,258 views. Verify the cooling control signal from the thermostat. Either the blower isn’t working properly or the system is out of balance in some other way. The heat pump functions on the same principle as refrigerators and air. Just this year, I have had issues with it not staying running. The contactor is a fairly simple part of your air conditioner and is really quite easy to repair or replace if it's your problem. Smarthome is your trusted advisor in home automation products, systems, and technology. This is a 40 amp 2 pole 24 volt setup and it is getting hung up in the "open" position. whether that's barely warmth mode then it perchance caught in a defrost mode, if it does it in the two senarios: 3. It struck me as very filmable, ready to scare the pants off people in dark. not be strong enough to close the contactor. It won't close when I turn the ac on. If your air conditioner has a one pole contactor can you replace it with a two pole contactor? compressor contactor is bad. They worked perfectly for two days, then the door popped open. old Fahrenheat FUH724 240VAC electric space heater malfunctioned this season. Many power companies, for a discount on your electric bill, install a load controller. Make sure fireplaces have tight-fitting dampers, which can be closed when the fireplace is not in use. The same if your pump is on low speed, or if valves are closed. However, we also show you how to trouble-shoot new-style electronic ignition burners. No movement means an open capacitor; no resistance means the capacitor is shorted. When I was trouble shooting yesterday and pushed the contactor down the contactor would sometimes stay down for 30-45 sec and then pop back out. Safety Contactor for Motors required? for the aux to open and one of the mains to stay closed. when I pushed it in, the compressor was able to start. This means that the contactor can be operated remotely, without the need for putting a person in a potentially dangerous location. When selecting contactors, you'll use one of two common standards: NEMA or IEC. Contactor coil: 50 Hz vs. This type of sensor can be used to turn off the air conditioning or heating if a window or door is opened. As mentioned here, the Crydom solid state relay was stuck closed. Kung Fu Maintenance shows AC Relay Air Conditioner Contactor Not Pulling In Five Most Often Causes 1) Bad Thermostat 2) Bad Wiring 3) Bad Contactor 4) Bad Tr. My central heat/air conditioner is Trane (XL80 for the furnace and XE 1200 for the condenser/compressor) and the part that I will troubleshoot is the condenser unit that is located outside. If your car won't start and you've changed your battery or jumped it, and if there's no sound at all out of the starter when you turn the key, then it's a good bet that your solenoid is bad. He's not a designer — and he doesn't live here. NC = Normally Closed, COM/POLE is connected to this when the relay coil is not magnetized. This most certainly sounds like you have a low voltage problem where the contactor is not getting the required 24 volts to energize the contacts. 435 American Home Shield Customer Care Reviews and Complaints @ Pissed Consumer American Home Shield Customer Care reviews: Charge. Kung Fu Maintenance shows AC Relay Air Conditioner Contactor Not Pulling In Five Most Often Causes 1) Bad Thermostat 2) Bad Wiring 3) Bad Contactor 4) Bad Tr. A relay shown in the picture is an electromagnetic or mechanical relay. If you notice visible leaks from your HVAC unit or an accumulated puddle, then you have a problem. You can call U-FIX-IT Appliance Parts at 817 472-7740 for free personalized help with the diagnosis. It can also be the most costly. This brings us to limit switches. Check out these common troubles and possible solutions. From energy-efficient Copeland Scroll™ compressors to highly precise Sensi™ thermostats to cutting-edge Emerson electronics and heating technology, our residential and commercial solutions set the industry standard allowing you to create a level of indoor comfort your customers won’t find anywhere else. Right now I'm having to smack the contactor to get it to kick in about once a day. We had a new Rheem high efficiency AC unit installed in early 2017 by Service America and during the summer months the AC has been struggling cooling the house. Now the only way to shut the unit off is to trip the breaker. I won't drive my car in the snow - too much of a risk of someone crashing into it. If it is, the unit won't come on in cooling mode. Please fee free to post your repair need so our Sun Doctors may help you. At Bill Joplin’s Air Conditioning & Heating, we focus on providing for the air conditioning needs for both residential and commercial customers throughout the McKinney, TX, area. Your spa heater assembly is a metal tube which contains a heating coil. Troubleshooting Guide. Consumer Alert - Bruno Air Conditioning FORT MYERS, FL. Alternating Current - AC: Electric current in which the direction of the flow is constantly being reversed back and forth. When I was trouble shooting yesterday and pushed the contactor down the contactor would sometimes stay down for 30-45 sec and then pop back out. Verify the cooling control signal from the thermostat. NC = Normally Closed, COM/POLE is connected to this when the relay coil is not magnetized. It can also be the most costly. Always check the manual, just to be sure. For training purposes for both home owners and technicians this article is going to cover the most common type of compressor used in residential applications, which is a […]. Some hams who have converted these transmitters, modified the circuit so the transmit/receive changeover function is achieved with the "plate-on" contactor, which means the big relay clanks at every "over". Greater power is required to close it. If the contactors contacts do not pull in or close (completing the high voltage circuit) voltage will not pass thru to the compressor. What is wrong with my a/c condenser if it buzzes but won't start? or a bad starter contactor/relay. I believe my contactor may be broken. Called back out same problem. A pressure switch can be easily jumped out with a wire and two alligator clips. CSLS Uses a Teaching Method You Won’t Find Elsewhere All of our study materials are based on the “Mizener Method,” which was developed by our founder and is the key to our home study materials, which have been used by tens of thousands of students. I'm in contact with TEC support at Comfort Aire and so far they don't know what is going on. Need help choosing kitchen cabinet brand and contactor- Ctrl NJ the KD's won't give. Need an electrical repair at your home or business? Call the electricians from On Time Electric, Inc. While holding the rear hatch handle in open position (lift handle up) - use screw driver to lightly push the lock mechanism down (not up). the terminals on the side take 24v to close the coil and start the unit. Broken motor bearings can cause a loud screech, while a motor that won’t turn at all may simply buzz loudly. Electrical & Code Related Forum for Electricians, Inspectors, Instructors, Engineers & Related Professionals. Perhaps the fan inside the furnace unit runs, but doesn't blow cool air?Here are a few of things you can do before calling an AC repair company. A bad capacitor can cause a variety of symptoms: the AC unit merely hums and "tries" to start, it runs a few minutes then trips a breaker, the fan won't start without a push, or it blows only hot air because the compressor can't start. Well, an air conditioner usually trips the breaker because it's pulling in more amps than the breaker is rated for. 6 Potential Problems If You Ignore Air Filter Replacement Aug 27, 2014 | Articles Your air conditioner's air filter isn't just there to help keep the air that comes out clean. The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. This circuit helps in reducing the coil current. what it won't deliver is the worst-case voltage required over the. As soon as i let it go ac turns off. I even tried restarting my computor and it still won't stay closed. Why is My Central Air Conditioner Turning On and Off Rapidly? determines how your AC runs. The standard current in a home is only 120 volts AC, so electricians use a contactor to increase the current. If you notice visible leaks from your HVAC unit or an accumulated puddle, then you have a problem. This is not uncommon. If the contactor has proper low voltage applied to the coil and it does not pull in, it is a bad contactor. What's wrong?. New DSC Series AC Speed Control Motors The DSC Series is a cost effective, high functioning and simple to use closed loop AC Speed Control system that offers easy to use speed control. Re: Troubleshooting an ac coil Magnetic Contactor, 07/30/2008 7:16 AM If the specs on the contactor are correct for the application and it is configured the same as others that are not burning out, the only cause of a contactor coil burning out would be an obstruction preventing the contactor armature from sealing in fully when it is energized. If the contactors contacts do not pull in or close (completing the high voltage circuit) voltage will not pass thru to the compressor. When selecting contactors, you'll use one of two common standards: NEMA or IEC. He then called a repairman who said it was a bad fan motor. 24 to 28 volts AC should be at the contactor coil when the thermostat is calling for cooling. When temperatures soar and your air conditioning unit is not cooling in the summer heat, you need a quick solution. Is there - Answered by a verified HVAC Technician. Pressure Switch: When your spa filter, or suction intakes, or return jets are clogged, blocked or obstructed, the pressure switch will stay closed and keep the heater from working. Very darned aggravating, indeed. For instance, if your hot water heater breaks and damages your floor, your policy will pay to fix the floor, but it won’t pay for a new hot water heater. For the most part everything else in the camper works off of 12-volt DC power. NSW Department of Education | education. New one is not pulling in either. Then you walk outside to find that your outdoor unit makes a clicking noise but won't come on.