Replaced old ac with new ac and new unit will not come on.Wiring is exact like the other one.

Might help

I have same issue swapped out old for new both digital but now ac blows heat. 4 wires wired exact same

Shooting from the hip here, but look at both the new and old wiring diagrams. Chances are that the new unit has terminal leads that would connect to the old units' relay/control box and you simply need to install the old box on the new A/C by connecting to the correct terminals. beyond that, you can build your own relay setup if you understand wiring diagrams. If you don't know wiring, I'd recomend taking to an RV shop, as you can damage either the A/C or the furnace or both if wired incorrectly... Hope this helped!

Hello, it is possible that the new thermostat has some type of time delay built in it. But typically this would shut of the outdoor unit first and then the air handler.

the wire diagram should tell you how. it all depends where wires lead to. be very carefull, capacitors can be dangerous. brown usaully go to fan black usaully goes to common red usaully goes to herm or compressor. it all depends where wires come from

You may need to check the wiring between the thermostat and the inside unit. Also check the wiring in the inside unit. It sounds like you may have a jump between the 24-volts hot and the control for the indoor fan.

use a seperate capicitor for the fan only pick up 1 leg of power from common side of the compressor cap and the other from the contactor or the board in a heat pump situation

yes but make sure the motors are exactly the same.check the voltage on both of them and see if they are both ac motors and not dc motors.if the new motor is dc it won't work.i have a hoover savvy that has a dc motor that i want to replace with a ac motor

I replaced one unite with another and the wires are differance colors the old unites wires are red,purple,yellow,bleck and white the new one have orange,brown,cream,darkpurple,and white