The homeowner experienced turning the system on, and it would click to run and then going to waiting mode for equipment. I checked over the system and all the low-voltage wiring. The contactor coil is starting to fail. Taking an om reading and pushing in the contactor, I found it would go from, 16 ohms down to in some cases .05 ohms losing resistance. This will cause a drop in voltage at the transformer resetting the thermostat. I replaced the contactor. The air handler has water in the secondary pan and the insulation inside the cabinet is wet. the supply Plenum is tapped straight off the end and this will cause higher velocity airflow through the coil making the condensate pan into the cabinet. I gave the homeowner a rough estimate for a replacing the supply Plenum. The unit unit is operating properly at this time for conditions
