I'm having problems with the Climate Control Blower Motor Speed.

The hot and the cold side of things seems to work ok, and but the actual speed of the blower keeps fluctuating. Very annoying as when the blower should be slow it kicking out at high speed. Either your burning up or freezing. Manual fan settings only work once in a while.

I just purchased the car so I have no idea if it did this at an earlier date.

I'm thinking it may be the Pushbutton control unit but would like to find out what others think before I fork over the cash for one.

I ran a diagnostic on it and I'm getting the following codes:
B1232 Refrigerant Pressure Sensor (B12)
B1416 Heating Water Circulation Pump (A31M)
B1417 Duo Valve (Y21)
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My question is, could the pressure sensor be causing the other problems or are they unrelated ? I believe they all tie together somehow, but not sure exactly how. Any help is greatly appreciated.

Thanks