Question I have a Lennox 10ACB36-12P central a/c compressor. It is not running and it's going to be over 90 degrees outside every day this week! Help! I checked the breaker, it's fine. There is air blowing from the vents inside but it is not cool. It's just barely cooler than the air in the house. Occasionally the compressor will make a slight buzzing sound for a bit and then quit. What do I need to replace?
If your positive the buzzing sound is from your compressor ,it may be locked up and trying to start, the excessive amperage draw trips the compressor internal overload .( buzzing noise stops ) then when the overload resets the buzzing noise starts.You need to let the compressor cool down ( if hot to the touch ) You may be able to install a hard start kit ( if your system does not have one ) to help the compressor start. also try replacing the compressor run capacitor. If it does not start chances compressor is bad. You do not state when was the last time your system was serviced or how old the unit is. Again the above guide is if your positive the noise is from the compressor. Touch the compressor should not be hot to the touch,unless bound up.You can also check the three wires at the compressor ( use inspection mirror if difficult to see ) and check to make sure the three hook ups at the compressor are not burnt or rotting and have a good contact with the compressor terminals
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.
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.