I can't make any promises that unplugging and plugging in the monovalve can't damage the control unit, those things seem to self-destruct without much help. All I can tell you is that I've cycled mine by unplugging and plugging it without any apparent damage. I've also cycled my monovalve by putting a 12V jumper on it from the battery without any problems. Your mileage may vary.

If you don't want to mess with the connector with the system on, you could have someone adjust the temp controller from heat to AC while you listen to and/or feel the monovalve. It should open for heat and close for AC. If the valve does not seem to be changing position (clicking) correctly you can check the voltage between the two contacts in the connector. You should see voltage to the valve for AC (valve closed) and no voltage for heat (valve open). The point of this exercise is to verify that the valve is actually closed when the AC is operating. If the valve is staying open the heater can overpower the AC and blow hot air. There is a post here someplace where someone replaced the monovalve then found out it was just a dirty connector causing it to stay open.

Good luck