DF50 Trim issue

[perkrim]

I'm a newbe to outboards so please bear with me.
My DF50 has a hydaulic tilt/trim mechanism.
It works fast at the upper 80% of the total movement, and slow at the lower 20%. I'm guessing that the lower part is the Trim section.
Further more I'm guessing that the Trim section is for adjusting the prop angle during operation at "high" speed/rpm.
Now to the question:
When I'm trying to trim during operation, the signal buzzer gives an alarm.
1: triming is not alowed during operation (makes no sence)
2: something is wrong (makes more sence)
What kind of error can lead to such behavior?

[boats.net]

Sounds like you may have a short in the control box or a wiring issue somewhere. The trim should not effect the alarm.