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I have a Copeland Scroll Compressor Copeland ZR49K3-TFD with a Ruud Air Handler UBHJ25J11SUZA1 A few weeks ago, we noticed that it would take a few minutes for the air handler to turn on after the compressor turned on. Didn't think it was a big deal and did address it. Last week, we went on vacation with the thermostat set to turn on the A/C periodically. When we came back, we found that the air handler had not turned on at all so the compressor was probably running for a day straight without the cold air circulating through the house. There was a lot of condensation that generated on the coils/pipes and it dripped onto the filter. Can't see anything else that has been damaged, but maybe also don't know where to look. My question is how to troubleshoot the problem with the air handler? Today, I turned the on the "fan only" switch on the thermostat and there was a low electrical hum from the air handler, but it would not turn on. The compressor/air handler are probably 12-15 years old (don't know for sure - they came with the house) but we have 2 other compressor/ah combos in other parts of the house that are the same age but have not had any problems like this one. Any help would be greatly appreciated.