I will try to assist you
Ok to start with the yellow wire is a control wire and should not connect to the capacitor. Are you talking about the contactor.? Here is a picture of the capacitor and the contactor
Let me start by asking if you replaced the thermostat trying to fix your problem was the unit operating fine and youjust decided to replace the thermostat and then the problem arose after installing the new thermostat?
There are three spots for connexion on the capacitor : FAN, C, and HERM. A brown wire and a purple wire are connected to FAN. A red wire is connected to C, and a yellow wire is connected to HERM. It was like that when the heat pump was received.
I had the same problem before I replaced the contactor. I wanted to make sure that the thermostal was good.
The replacement did not solve the problem at all.The 24 volts coming from the thermostat do not reach the defrost control board and the contactor. I am trying to find if some other electrical part is defective.
Ok those wires going to the capacitor have nothing to do with the 24 volt circuit. Those are high voltage wires(not in your control circuit at all),So lets don't concentrate on the capacitor. Your control wires should go to the board in the outdoor unit. C,W2,O,Y and R . Lets start at the board with your meter.With thermostat calling for cool, Tell me if you have 24 volts between C and Y where they connect to the board
Ok, if you have no 24 volts between common"C" and cooling "Y" at the board, we are loosing it before we get to the outdoor unit. Those control wires come starlight from indoor to the board ,correct?
Have you checked to see if you might have a float switch in the drain inside that might be be breaking the circuit?
The common C goes from inside to the board in the outdoor unit. The Y from inside goes to a blue and pink wire that goes into the lower part of the casing. I do not see where it goes. The Y on the board is connected to the contactor, but it does not carry any voltage at all.
I have not checked about a float. If you wish, I can do that later and contact you again tomorrow.
Ok, first, can you disconnect the "Y" yellow wire where it comes into the unit (probably a wire nut) and check between the yellow from indoor unit to he "C" at the board?. If you have 24 volts there, it is most likely a pressure switch in the outdoor unit.Can you do that tonight?
I will be here
We have the 24 volts there. Then, as you say, the problem is probably with a pressure switch. Is this a part I can replace myself or should I call in a repair person?
Thank you for your help so far!
You will have to call in a tech because the pressure switch is welded into the refrigerant line. Also it is a possibility that the pressure switch is not bad.Your system may be out of freon. I realize it is not that old, but it is not entirely out of the question that you don't have a refrigerant leak somewhere..Equipment leaks are much more common today with the quality of copper and material .