200 psi is a lot for the low side. works out almost 14 bars which is typically what you see at the HIGH side. That is what happens when the compressor is turned off due to overfilling and when the expansion valve is fully open.
Check your sensor values through the hidden menu on the a/c controller. especially for the refrigerant pressure when the a/c is running (#7). How to do it should be in the stickies (press and hold REST button).
When the high side is so high due to overfilling, the a/c controller asks for maximum cooling to remove heat from the condenser, and to reduce the high side pressure. That is why when you turn on the a/c, you get the maximum airflow demand, which generated the fan fault. When you reduced the pressure, the airflow demand wendt lower, so the fan message did not show up. I guess you can still get the fan message by pressing the AUTO buttons simultaneously to demand highest fan speed, for testing and confirmation.
So, the demand from the refr. overfill is more likely the symptom, rather than the cause, if the fan test action confirms it.