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If this unit is new more than likely the condesate drain line does not have a deep U shaped "trap"in it. This allows the negative air pressure inside the unit to draw air up thru the drain line holding the water inside the cabinet until the fan shuts off, then the water can drop out of the unit everywhere.
If the system has been in foe some time and has the proper "trap" the drain line could be plugged any where there is a turn in the pipe. It is a messy clean out but it can be done by cutting the straight PVC pipe, right after the screw in fitting and the 90. This will allow you to unscrew the fitting at the unit and clean it out. Sometime there is a gel like clog that grows at this point. Then you can take a wire or compressed air to clean out the rest of the line to the outlet. Next pour hot water thru the PVC and see how it comes out the end. Worst case you will need to pour a solution of hot water and white vinegar to remove any build up.
You need to access the evaporator coil on the inside of your air handler and unplug the drain for the condensate. It should be the 3/4 inch line, if the 1/2 inch line is capped then it is not doing anything and has probably been abandoned.Open up the unit and clean the drip pan and drain hole where the 3/4 line starts. This should clear up your water leak problem.
What is leaking? If it is water, you need to find the drain pipe leading from the inside unit to the outside of the house, and open up the obstruction in it. You could push a wire up through it, or send some compressed air up it. The drain pipe is probably near the ground next to the foundation or in the ceiling of an outside porch. If this is a window unit leaking water you need to clean the obstruction out of the drain pipe or hole on the outside of the window, probably at the bottom outside rear of the unit. I wasn't sure from your question if it is leaking water, or leaking refrigerant gas. If it's the gas you probably need to call an A/C repair service. good luck, genetuck
follow the white pvc drain pipe to it .the over flow is next to the drain pipe.. this should have a cap over it .if your furnance is leaking water the drain is clogg.. use a shop vac to unclogg the drain pipe where it drains at the floor drain
The air handler should be pitched enough to to alow the evaporator condensate pan to drain. the best way I have found to keep it and the drain pipe clean is to use a wet/dry vac Some drains have a **** trap to keep some water in the drain pan.
This is a condensation drain, The pipes were probably just pressed together. it is actually a T fitting . The tubes just need to be fitted together and pushed together. the lower pipe drains to the outside of the house and the one pointing up is just a vent so the water won't back up and a way to flush the lower pipe. Nothing serious, good luck