I have a goodman aruf 1729168a airhandler with a 5 kw heat kit and the wiring harnes has a purple wire on it that was not connected and would like to know where that particular wire would go..... the purple on the female end is already going to board and to the motor and the other purple is going to the transformer but the other end on the male plug is not hooked to anything please help, heat strips come on but fan does not.

With a heat pump the indoor fan coil does not have a yellow wire that is true your yellow wiring comes from the thermostat which is a 6 wire or 8 which is also true coming from the outdoor condenser you must connect the yellow coming from the condenser and the yellow coming from the thermostat inside the fan coil cabinet the purple is for heating

Is this a 2 stage cooling system because only then you will need y2.
You can put any color you like on these terminal but it have to match up with the thermostat for example if you put black on R terminal on air handler then you have to put black on R on thermostat

your heat-relay aka heat sequencer, time delay... is stuck most likely remove and replace if it checks closed and no 24 volts is going to the timer portion.for 3 to 5 minutes. some of these switches stay closed for 3-5 minutes.after power is removed

Check the breakers on the unit How many KW--electric heat? Check to see if you have the right wires wired up to the correct breaker cause some units have 40---and ---60 ---amps breakers and your thickest wire could be wired to the 40-amp breakers,, (some 5 KW pullls 19-23 amps respectably some breakers have 7.5 KW heat stips and pulls more and if the wire size can,t cary the amps, then all you have to do is reduce a heat strip.

The wires on a Goodman Air Handler Red to R, blue or brown to c, yellow to y cool, green fan g, white to w heat

diagram tells it all

You may need a "current sensing relay" to clip around the neutral wire on your blower.
Run the 120v power to the main power (the power switch- hot,neutral and ground) . Run the Hot wire through the "Current Sesing Relay" wires to the EAC unit's 120v. power input. The unit will only run when the fan is on.

Hope this helps,
Matt

the thermostat sub base has a place to connect a wire usually white to energize the heat strips when you push the stat way hotter than the house temp. that is why the strips come on in normal heat. it also has a terminal that is only energized in emergency heat and it also should have a wire connected to it so that terminal can supply power to the strips when the stat is switched into emerg heat . you can identify the terminal from the wiring diagram and if need be jumper w2 wire over to the aux terminal and it will work. they both go back into the airhandler and power the same strips. w2..................................................................................................w2 in airhandler to strips or w2...jumper to aux......................................................................................................................w2 in airhandler to strips.

run new two wire