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Hello, the filters are located in or near the blower compartment of the furnace or air handler... if not there, the filter is located behind a hinged return air grill, generally in a hall way ceiling... the fact that you do not know where the filter is means that it has not been changed and could very well be the problem.
Look at the outside unit if there is one, and the largest copper tube connected, tell me if it has ice on it or not,
We can go from there
Yes, filters fit into a slot just ahead of the furnace return air duct, or inside the same compartment the furnace blower is in.
If not there, the filter is fit into a return air grill.
Tell me if the outside unit fan was running or not when you checked for ice on the tubing please
we can go from there
There is tiny float switch that fits into the 1" diameter white plastic condensate drain from the cooling coil... the cooling coil box is about 20" cubed, and is mounted on the outlet end of the furnace... the switch will have 2 wires attached, look for that and remove the float and clean it...if its there...not all contractors install such a switch
If the float rises, it will open the switch and kill power to the AC.
Tell me if the main furnace blower runs when you set the thermostat on cooling and down to 60F, or not, and if the outside unit fan runs at the same time or not.
Thanks, ***** ***** is with the outside unit most likely, there are 2 or 3 tiny 18 gauge wires in a plastic sheath running to the outside unit, those originate from the furnace blower compartment printed circuit board... measure the voltage between those two or three terminals using a multi meter set on AC voltage.
How hot is it outside now, that will tell me if the high pressure safety switch tripped or not
How old is the unit and have you been cleaning it s wrap around condenser coil?
inspect the condenser coil of dirt burried deep between the fins, not all maintenance outfits do a proper job.
you should be able to see clear through the coil at a 45 degree angle