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So your saying that when you set t-stat on cooling the unit starts but shuts itself off in seconds?
Do you have a microfarad tester to prove new capacitor is burned out
A capacitor can burn out for no reason like a light bulb, most time it will bulge out the top where the wires connect, or in a case where the compressor or fan motor are defective it can strain out the capacitor.
Do you have a volt meter?
good, Contactor has to be engaged with 24Vac coming from t-stat to give 240Vac to the compressor and fan
Here is a link to picture
Did you look at the link I sent you, it shows a picture of a contactor and contact points
T-stat 24v between R and C, or R and Y if system is off
is your tester on AC? NOT DC, if your not sure check it in a wall outlet for 120vac
OK does t-stat have a terminal C and has a wire to it?
I would check for a burned fuse in the indoor unit first, what model furnace is it?
Open bottom compartment of furnace to access control board, notice the door switch, you need to tape that in to have power to unit, check fuse on board, if good then volt check 24v a terminal R and C
24v between R and C?
I have to leave soon, I was still waiting for you response.
Taking you to long to respond, communication and details are the key to resolving issue.
I will check with you later, here is next step to check is if you have a float switch in a pan under you furnace thats not making contact, or a condensate pump beside your furnace with a float safety switch with two wires, you can put the 2 wires together to see if that is the problem