I checked the contacts. I cleaned them with emery paper to try and make sure there was a good contact. But the buzzing keep on. The buzzing is coming from the brown connector where the contacts are. I am assuming that is the coil? I am guessing I need to replace it since cleaning up the contacts didn't work. Is there something else I should do? If I need to replace it would I need to order the part from a HVAC company or can I get it from a hardware store i.e. Home Depot?
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Re: Buzzing on unit
It sounds like the buzzing is a bad coil. the part is not carried at Home Depot you will have to fine it at an A/C supply house.
there are different types. there are single pole and double pole.
single pole have one set of contacts. doulbe pole have 2 make sure to get the right one. also make sure you get a 24 volt coil.
you could maybe order the part on line.
When changing the contactor. SECURE POWER to the condenser and the air handler remove the existing contactor from the cabinet leaving all the wires connected to it if possible. you may have to disconnect the power leads comming in. Swing it out of the way. Install the new contactor in place then move the wires one at a time matching location from old to new. Do NOT
get them mixed up. Or you could make a drawing of the part on paper locating the wires so you then may return them to the proper location. If you feel this may be to difficult for you call a service company and ask there charge to replace a contactor.
The part is usually @ 12.00 to 15.00 our cost so the part should be @ 30.00 0r 40.00 retail. then a service call charge.
good luck if you need more help let me know
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When you say checks out good what does that mean? If 24 volts is applied to the contactor it should "Pull in" and you should hear a slight buzzing sound. If that is happening then you have lost line (240 volt) power and should check circuit breakers and the dis
connect that is on the wall of the house beside the unit.
Ok, If 3 amp fuse is blowing in the air handler unit when switch is turned to cool check to see if outside unit jump starts and stops when this happens. If this is the case wiring is fine check main relay in outdoor unit. There will be a spring contact on main relay (Black relay close to where wires come into unit), check for corrosion or carbon build-up on little round contacts. If you can clean contacts with a small piece of sand paper. Make sure all breakers are off before removing cover! You might have to remove relay in order to clean it. Make sure you write down exact locations of any wires you remove. This should fix the problem.
Hi, relays will also buzz causing units to loose transformers, I have seen this in the past years also. A 2-stage heat-pump stat? I would remove the front to expose the wiring terminals and pull the hot wire red, 24 volts and that should kill the buzz. If so, the circuitry is going out and you will need a new thermostat. I would, if you have a volt meter check the incoming voltage to the stat to make sure it doesn't exceed the proper voltage rated on the cover. Max would be 30 volts ac. If its over that, the transformer is putting out to much on the secondary side and should be replaced, or it will eventually take all of the low voltage controls out. Try removing the 24 volt hot wire and also if you have a friend that has a meter or you do, check the voltage coming in to the stat. Get back to me if it exceeds the rating, as this will cause the buzzing. It may just be faulty contacts in this stat also. I wish you the best, and ask that you are kind when rating me in helping you. Please keep me posted if you need my help. Sincerely, Shastalaker7 A/C Heating & Refrigeration Contractor.
It is called a contactor and you can buy one at www.grainger.com however the buzzing is often more related electrical frequency rather then if it is weak or not...
Replaceing this is a good idea though because the contacts wear out and can weld together if they get too hot...
The one you would want is on page 272 in grainger...you want a 1 pole 24 volt coil...probably 1V598
It may just be a contacts issue. Try this: Disconnect the power to the outside unit, both 220 and 110v. Open the service panel, and then open the metal enclosure around where the wiring enters the case. This is 220 volts to the contacts, controlled by a 110v relay. Inspect the contacts, and clean if necessary. For some reason, critters like to get into the contacet (ants and such), and they also foul over time. Make sure that there is no power on before you make any attempts to inspect or clean! If you have an electrical test meter, always verify that the circuit is dead! I clean my contacts with a fine sandpaper or emery board, and contact cleaner to further clean and lubricate the mechanical portion of it. Reassemble, and try it.
Best regards, --W/D--. Please feel free to rate this solution.
The buzzing noise is your contactor drawing in from your thermostat. The fan part of your unit is on a different circuit from your outside A\C unit. Your thermostat is the conductor of the orchestra tying ths units together. It may well be that your A\C circuit breaker has tripped, if it has there is a reason for it's tripping. Resetting the breaker by turning it off then on may get your unit running, but a technician needs to ascertain why it tripped. Or it could be a bad contact switch inside the outside unit not letting enough electricity through the switch. More than likely the first issue. Good Luck
The buzzing if it is real loud is a very wore out contactor and could be the cause of your unit not running. Check your circuit breaker. you'll likely need service and have the unit cleaned for best performance. Good luck Tom
Is the buzzing in the outdoor half of the system? If so
your possibilities are.
buzzing could be the contactor. In the control compartment on the side of the unit there is a small brown component that has wires to one side and the other . There are contacts in the center like points on a car. If the points are pulled in look for ants in between the contacts. Always secure power to the outdoor unit before touching anything inside. If the points are pulled in check your breaker to the outdoor unit. Turn the breaker off then back on. Breakers sometimes trip but look ok.
Buzzing could be thee coil to the contactor itself, sometimes with age the coil will breakdown and cause noise.
if you give me more information I can focas in closer to a solution