Came out today for a no AC call. Upon inspection I found the indoor unit operating but the out door unit was not operating. I tested to insure the unit was getting the proper volt and found that there was 24 volts going into the high pressure switch but not coming out to pull in the contactor. I tried to reset the high pressure switch several times with no success. I then bypassed the pressure switch and the unit started right up. The pressure switch has failed and needs to be replaced. Order pressure switch and a tee fitting to add the switch externally on the liquid line due to the factory switch being brazed on.