Heating, Air Conditioning, Fridge, HVAC/Outside AC unit

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Question
I dont know if it was you that I asked the original question. Someone answered but the link provided in my email to see the answer does not work. My original question was:

Sitting watching television at about 11pm with the sliding glass doors open. I heard a noise outside. I go to investigate and I hear a cracking/popping sound coming from the outside ac unit and the smell of electric burning. The unit was not turned on when this happened so therefore was not running. I immediately turned off the power to the unit. Any idea of what this could be and what I might be looking at? I am a bit befuddled especially since the unit was not even running at the time. Any advice would be appreciated. This does not involve a heat pump.

Answer
Lee,

If this is a packaged one piece unit, It could be the transformer, as the transformer is powered all the time.They do burn out with age.Shut of the power to the outdoor unit and remove the electrical panel and check your wiring ,If indeed it is the transformer, they are inexpensive part, needing to match the VA rating ,typically it's 40 VA if your unit is a 220 volt system then the voltage rating would be 220 volt primary 24 volt ac secondary

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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