I have a ruud ubea-21j10nfhai air handler what size unit do i need

SOURCE: Wiring Diagram

here is a basic wiring diagram for all air cond systems your thermostat consist of treminal r w y and c run a four conductor wire fromm thermostat to ai handler the air handler should allso have eather have red blue white wires or a teminal block marked r w c r stands for red w for white c for comon allso blue run color for color from the thermostat to ai handler with exeption of yellow yellow runs straigth to condenserand retuns in white wire to air handler wich gets conected to comon hope this help[s you

SOURCE: Old Ruud Air Conditioner

all heat pumps follow the same schematics universal get a hold of any heat pump schem and you should be able to aplie it to yours

SOURCE: Air Handler leaking

First make sure unit is level. Drain pan may be dirty. On the rheem or Ruud unit the back of the pan gets stopped up. Ithas small holes that let the water by and they get stopped up. Now even though your drain is clean you may have a stopped up dain pan. Check this > These are problems you can take care of your self. Open up the top panel of your unit and you can look down on the drain pan. Check for dirt and stoppage near the outlet of the drain pan. You amy also have a cracked drain pan but I doubt it. Rus

SOURCE: RUUD UBHA-14 J11SFJA air handler. The fan (blower) doesn?t runs

Absolutely, however, you want to properly diagnose the reason why the fan is not running. It could be a less expensive part than the fan motor itself.
First, check to see if you have the proper voltage going to the motor. I believe your motor requires 240volts ac. If you do not have 240 volts, you have a control problem.......either the thermostat is failing to close R & G or your blower relay may have failed to close the contacts necessary for your fan to operate.
If you have the voltage, then you want try spinning the blower wheel with your hand. Does it spin freely? Is the motor warm/hot? If so, turn everything off for an hour or so. As soon as your energize it, try spinning the motor with your hand again.....if it spins freely with no resistance and then starts running by itself, the problem is the run capacitor (approx $20.00 depending on where you purchase it from). If there is resistance when you try to spin it, the problem is most likely with the bearings and you will need to replace the motor.......if you have to replace the motor, go ahead and replace the capacitor also, making sure it is properly "matched" with your new motor.

I hope you find this to be very helpful to you, moving forward. :-)

SOURCE: air handler motor stopped working

Check the capacitor before you replace the motor. It's a common problem that's easily fixed. Make sure the fan rotates freely.