Replace Merv 11 20 x 20 x 5 filter quantity 2 Started with unit upstairs, the unit upstairs is working properly. We were getting .5 inches of water column on the supply and return. It is good and within manufacture specific ratings. I also checked temperature splits as soon as the AC kicked on for five minutes we were getting 20° differential checked condensing unit refrigerant pressure It was good. We were getting a good subcool and superheat. Checked ohms amperage and motors amps , compressor amps and they are good, checked capacitor and it’s in good. unit downstairs Checked the furnace, we were getting 0.5 inches of water column. Good for manufacture specific ratings, this is the one that had problems to RC terminal noticed that it was a wiring issue so once I establish proper connection, reset an 3amp fuse. The unit was working properly., tested equipment got a 20° differential the unit was within optimal range checked amperage on the motors, compressor, indoor fan motor t
