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White is typically the 'common' or 'neutral' wire.
Green is a physical ground.
red and blue are 'hot' and generally control the fans speeds.
blue being low speed (usually)
red being medium (usually)
and both being high speed
this information is based on the 'typical' color coding. Some manufacturers deliberately dissent from following protocols.
to be certain you need a multi meter to check resistances, voltage points, and continuity.
with the unit disconnected from power, check the green wire to the fan casing and the motor housing. If either of these show 0 ohms, you have confirmed it is actually a ground wire.
with the unit disconnected from power, check resistance from the red to white and again from the blue to white. The lower of the two readings is slow speed; obviously the other would be mid speed.
with the motor disconnected from the speed selector switch, and power ON (please use caution) check the white wire to the other points of the switch, as you select each of the available speeds.
UNPLUG the unit after the test.
With your readings it should be evident where each wire should be connected. HOWEVER, if you have surmised wrong? be prepared for the unit, when powered up, to blow a circuit breaker. DON'T PANIC! simply unplug the unit, reset the breaker, make the obvious changes and try it again.
Of course it may be simpler and safer simply to replace the unit. Please don't hurt yourself over a few dollars.
The Yellow wire is for cooling, the white is for heating, the red is for power, the green is for blower fan, the blue is your common wire, all you should have to do is color code the wires to the thermostat. The thermostat should have the colors labeled R,W1,G,Y,B or C for common if it's wired correctly at the Air Handler or evaporator. The blue wire should go to B, or C.
White is your neutral so white goes to white. Blue on the fan is for the light kit you need to wire that to the wire from your switch so it works the lights. Black is the hot wire that is always hot not switched so tie that to the wire that is not on your switch. Green is ground so green to green. white to white / green to green/ black to black/ red to blue/
Under normal circumstances, NO!
Black is normally power in to a box and to a switch. The switch controls the power out to the red line and most likely the blue line.
White is always circuit neutral (ground).
Your power will most likely come in via black and then go to the lights on either red or blue and to the fan on the other wire, either red or blue, the color you did NOT use for the lights. Some place you should also have a bare or green wire that would act as equipment ground, connecting to the metal of the box.
Hi .. with only bone switch for this combo unit, the connections would be like this .. all ahites together with the romex white , all colors, red, black, blue with the romex black, all greens together IF you had more than one switch , then the red, black, blue would be connected separately to one switch eack and separately to a 4 wire romex from the switch to the combo unit.
There is no real color code for wiring but the standard is red wire to r, yellow wire to y,white wire to w, green wire to g, blue wire to c. since there's no c on your t- stat its probably battery operated, but in your case im betting white wire to w, and blue wire to g.