This afternoon, I repaired a malfunctioning Carrier central air conditioning system for a customer. The homeowner reported the AC had stopped cooling effectively. After diagnosing the issue, I discovered a failed dual run capacitor was preventing the compressor from starting properly. I carefully replaced the faulty capacitor component and then tested the system to verify proper cooling operation had been restored. The customer now has their high-efficiency AC system running reliably again, just in time for the summer heat.