I am replacing a ceiling fan where the old fan had 2 wall switches (one for fan and one for the light) I read a previous post related to this question, but does not apply to my situation. The wires in the ceiling box are the same (black, white, green, and red) but no blue. The new fan (with remote and light)) has only black, white, and green wires. When connecting the new fan wires to the same color wires in the box, the new fan runs at a very slow speed , but does not respond to the remote, other than on and off. Anyone know what the problem is?
Oh, and the white wire from the box comes off of two white wires, one of which was hot, even when both wall switches were off. I believe it came from a common white connected to another ceiling light in the next room. When I disconnected the joint 
The new fan is a Harbor breeze model saratoga #00798.
Best Answer
It's also worthy to check and see that the fan itself has its own speed control pull switch at the fan itself... Or possibly some dip switch settings in the fan, like speed options and even possibly other settings like hz. settings... I'm guessing of course, and I may have missed something in your original post, but especially if this fan has a pull chain speed switch in it, the fan itself must be in the high speed position at the fan, especially if you have a wall switch associated with it.