OK that works using the fan +/- button. Here is what I got:
1 - 75
2 - 67
3 - 73
5 - 73
6 - 80
7 - 4.7
8 - 71
9 - 37
10 - 125

According to http://pages.prodigy.net/jforgione/MB_AAC.html
I don't see anything wrong. The AC system shows about 85 psi on both high and low side without compressor ON which is about the same as #7 (4.7 bar). Is this number (pressure) too low which causes the EC to be on all the time?