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Even if your air conditioner circuit breaker keeps tripping, be patient, and rule out the most likely causes. Re: 50-Amp AC Breaker Keeps Tripping 09/15/2009 8:22 AM Have seen the same problem befor. Supply correct voltage to the motor. When I reset the breaker ... Air conditioner seems to be running but not blowing cool air. As we just mentioned, never keep turning it back on if the AC circuit breaker if it keeps tripping! 3) An electrical possibility is that the motor has an open phase. The contactor is the part of the air conditioner that controls the flow of electricity into the unit. Motor windings burned out. This can cause a high resistance connection in the contactor. 1. … 7.) I am still popping fuses and reading over 24 volts. I had the same problem a month ago. When you turn off your AC, the contactor goes up, blocking power. Why does the high-pressure switch trip so often? It trips overnight every night. Replace the "up" button. These capacitors will occasionally fail, causing a compressor to fail to start. 4.) I called a Heating and Air Condition Repair shop. My AC Unit was barely blowing out warm air and the circuit kept tripping. 1.) some times when the compressor starts under high head pressure it will cause the breaker to trip. The AC Contactor is defective. When I turn on the furnace it trips the 50 AMP circuit breaker at the back of the electric meter. Turn it to the "off" position if it isn't there already, then back to the "on" position. It still trips every night. As we approach the warmer months of the year, HVAC technicians of all kinds start to see more AC system breakdowns. In some cases, the AC Contactor can fail, not allowing the voltage coming in to transfer out to the motor. Most contactor manuf. 5.) It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. An overloaded circuit is the most common reason for a circuit breaker tripping. Hours: The best way to test the AC Contactor is to use a multi meter to test the voltage coming in and the voltage going out. 3.) BENCASEY83. There are several reasons why your air conditioner could be drawing more electrical current than it should – the most common being a refrigerant loss, which causes the compressor to work harder. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. • If any blackened plugs, very damaged wires, or noisy circuit breakers are discovered, an electrical problem has occurred and the homeowner should call an electrician. Many single-phase compressors require a start capacitor to assist in starting the motor. Contactors pull electrical contacts apart when power is not needed, and close the contacts to power something up. The breaker is tripping for a reason. We all have portable AC units in our room for that, but whenever I try to turn on my portable AC, the window AC also goes off after a minute or so, we noticed that the circuit breaker keeps popping/tripping so we go back and reset it. AC tech said mice chewed thru capacitor and he replaced it, After a week, circuit breaker tripped. This time the breaker was tripped. 7 Reasons why your AC keeps tripping the circuit breaker! The voltage out of the transformer reads 26.3 volts. Visually inspect the compressor contactor for any signs of heat damage. Air Compressor Keeps Tripping on Reset & Blowing Fuses How to Troubleshoot an Air Compressor That Keeps Tripping on Reset & Blowing Fuses. If your AC breaker keeps tripping, you will need AC repair, but you can prevent it with proper maintenance. Tripped circuit breaker that night. Normal voltage at the contactor with the contactor energized should be between 24 and 28 volts AC. 6.) Circuit breaker keeps tripping: If the circuit breaker to your indoor or outdoor unit trips, you may reset it. In theory, there would be zero volts measured at that point, but if the insulation is "leaking" a small voltage may be present. Phone: (561) 777-9888. Earth fault protection of an AC motor in 4 different earthing systems (ob photo: Engineer testing the SEL-710 motor protection relay in a 2.4kV motor control center) ... and hence delay tripping. Not the neutral, but the ground. A capacitor is responsible for starting the compressor, and if the compressor has trouble starting, it could pull too many amps and trip the breaker. I have to swap out a contactor for my AC. All Time Air Conditioning is an Air Conditioning Repair Service, Air conditioning contractor, Air conditioning system supplier, and. If there are many deep pits (greater than 1/32"), then the contactor must be replaced. Overhead limit switch is defective. Replace fuse or reset circuit breaker. Thermostat Issues Need help determining single or double pole contactor. Learn some of the most common reasons why your air conditioner keeps turning on and off and how you can stop your air conditioner from short cycling. You can follow the steps below once to make sure there really is a problem before continuing. After paying them $70 (a great value) it was determined that the circuit breaker was bad and that I needed freon. Your air conditioning system was most likely hibernating through the cool winter months, so of course when it's needed the most, it breaks down at the worst possible time . Overloaded Circuit . If you find yourself asking, “Why does my AC Breaker keep tripping?” more often than not, you may have an electrical issue that needs addressing. Replace the AC contactor… If possible (with the main power off), remove the arc-shield and inspect the contacts for pitting. You just have to know what to look for and where to look for it. the soft start kit will stop this problem. 1) Blocked air filter. Problem: My outdoor air conditioning unit’s high-pressure switch trips ever so often. If the air conditioner is the source of the tripping, it may be overheating. Overheating is a primary cause of a failed start capacitor. 2.) If it keeps tripping, something needs to be fixed. Motors must be operated at rated voltage and frequency, and the motor overload can then be calculated by comparing the … If all else fails, then call in a professional. Address: 2940 NW Commerce Park Dr #12, Boynton Beach, FL 33426. Reasons your AC trips the circuit breaker. An AC contactor is an electrically controlled switch used for switching a power circuit. If your AC filter is blocked, the blower has to to work longer and harder to circulate air... 2) Dirty outside unit. When an air conditioner overheats, it draws more amps (a measurement of electrical current) from the circuit. If you air conditioner is having trouble starting before the circuit breaker trips, it points to a bad capacitor. • Make sure furniture is not on or pushing against electrical wires. Will a bad contactor, run capacitor or relay cause the A.C. circuit breaker to trip - Answered by a verified HVAC Technician ... My outdoor compressor keeps tripping the circuit breaker on my panel. Most of the time when a contactor is energized the voltage goes down slightly. He said replace the circuit breaker if it keeps tripping, which we did. Jan 28, 2017 #6 Thanks for that guys now i have another problem on this circuit. So it’s a regular day in the shop just like any other, you’ve got your air compressor tank filled up with air, you get to use your air tool. The voltage should never go below 24 volts or you will have possible problems with contactor chatter or the contactor not closing at all. Check Red to Blue, Blue to Yellow, and Red to Yellow phases. The inside unit and thermostat seem to be working fine. A hot tub tripping a breaker isn’t an uncommon problem, and the potential causes are pretty easy to spot. By the same token, every time you turn on the air conditioner, the contactor is lowered, allowing electricity to power the system. However, this time it’s a little bit different. Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. There are a variety of possible causes for the circuit breaker to be tripped, but it could be due to overheating. The air conditioning works fine. Like Reply. At this point we have replaced the ac breaker which led to having an Electrician replace the main breaker but now its tripping the breaker all over again. Joined Jan 27, 2017 41. Air Conditioning and Cooling Systems - Carrier AC keeps tripping breaker - outside A/C unit - This forum has helped me before so I really appreciate it! I flipped the breaker back on and it instantly tripped again. If the contactor in your AC unit fails, the compressor can't send out the refrigerant needed. If the breaker trips a second time, then you should schedule a service call. Electric motors have a rated voltage and frequency and a rated full load current which can all be found on the motor nameplate. Answer: The high-pressure switch tripping on an air conditioner or heat pump unit can be caused by several things: 1. This is known as single phasing. Max. B. Thread Starter. However, only the window AC automatically turns back on, while my portable AC … Your circuit breaker’s job is to protect your home by shutting down the flow of electricity when it gets too high. 10 Reasons Your AC Keeps Turning On and Off & How to Fix It. AC tech came out again and replaced a "frayed" wire. When the summer started the outside ac unit quit working. Check for voltage (AC) between the motor frame itself, cleaning the paint off or finding a good bare spot, and the power supply ground wire. Today when we tried to turn on the air conditioner we had no luck. He said probably condenser needs to be replaced. Finally, this will also keep your air conditioner more energy efficient and give you better reliability for peace of mind. The relay switch that sends electricity to your air conditioner's compressor is known as a contactor. If your air conditioning unit is tripping your circuit breaker, the first thing to remember is don’t turn it back on.