New ac seer 15 when ut turns on I have buzzing in electrical circuit box

sorry but not a diy fix , call a local repair service

It is federal law that each new piece of A/C equipment have the yellow SEER rating.
The higher the SEER, the less electricity the system uses to operate.
You need to follow up since it appears your contractor installed a less efficient/expensive system than what you paid for.
Good luck.

Check with you energy company. We found out after we replaced our unit, that if we went with a particular seer we would have qualified for discounts to our bill as well as government incentives and additional discounts. It will keep you cost reasonable and your energy company will give you an honest answer to which will be best for your specific house layout as well as your electrical connections that will need to match up with your new unit. Hope this helped some.

does your burner flame up and then go put two or three times if so
all you have to do is take out the burner and clean all the soot out of it and then wipe off the sensor

The buzzing sounds like the fan trying to start. Try a new fan capacitor, or get a new fan

Check the rating plate on the ac; the rating plate may be on the back, bottom, just inside the front grille on the ac. It probably has to much current draw for the electrical circuit that it is on. There also may be other electrical devices that are on that same circuit and all of those devices together are to much for that circuit. Check the fuse or circuit breaker that it is tripping/blowing and compare that to all the devices that go off when the ac trips the circuit. Place the ac on another circuit by itself of remove some things from the other circuit that it is already on so that it does not draw to much current. The circuit that it is on now is probably just 15 or 20 amps. That 15 or 20 amp circuit has to run all the devices that are on that circuit. Some ac can draw that much current alone depending on how many btu's it is. Unplug everything from that circuit except the ac and see if it will then start up and if it does that just means that to many things are on the circuit. If the ac still does not start up and run, then the ac itself may have a problem.

THERE MAY BE A SHORT IN THE WIRING OR THE COMPRESSOR OR THE
FAN MOTOR MAY BE BAD. HAVE A AC TEC CHECK IT OUT.

Depending on make and model sounds like a check valve clicking. It can sound like it is coming from that area. You say your unit is 16 years old. Honeywell did servey on unit 10 years and older and found out they loose 25% effeicency after 10 years. You may think about changing it out. With the new tax credits you can get a 16 seer unit for the price of a 13 seer. I went from a 10 to 15 seer and my power bill dropped 40%. Rus.

Call the electrical inspecting agency in your area, they can answer your question

Yes a higher SEER can help reduce electric costs. However. In most cases this will require changing both the indoor and outdoor units. In other words if you have a 10 SEER matched system and only upgrade the outdoor unit to a 14 SEER you will not get exactly 14 SEER efficiency. They must match.

Before excepting bids on new equipment I would first higher a licensed company to measure the Heat gain/loss from you house. This information will tell you if the current system was originally sized correctly. The improper sizing can lead to high electric bills as well. I hope this helps.