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Mitsubishi Indoor/Outdoor Problem - One unit drips water when OFF
I have Mitsubishi Indoor/Outdoor AC/HeatPump unit.
The outside is MR Slim R410A Model MXZ-4B36NA.
On the inside, I have 1 18,000 BTU unit for the downstairs, and 1 9000 and 2 6000's for the bedrooms upstairs. I know it's a little overloaded, but I rarely ever have all 4 units on at the same time.
I have problems with the 9000 in the master restroom and one of the 6000's in one of my daughters rooms. The 9000 seems to get stuck in "Dry" mode, when it is set to be in "Cool" mode. The bigger problem is the 6000.
The first issue with the 6000 is that "sometimes" it freezes the room out. I'll go in there and its set on 69 degrees, but the room is 59, and the AC is still on. The second issue with that unit is that when the downstairs unit is on, the 6000 upstairs is dripping water out of the drain like it is running, which it is not, it is off, with the flaps close and no fan running. I can feel something is going on inside it because it is very cold inside the unit.
Does anybody have any clues on what might be going on with that 6000 unit? Is it normal behavior? It sound to me like the other units (on one other unit) are affecting the 6000. The contractor that installed them never returns my calls. I get they are very busy, but basically we have been abandoned.