I got 4 Mitsubishi a/c units all working fine for 6 years.
My house has pre-drilled points for a/c units, and pre made drainage pipes leading to the outside.
While the 3 ac's drain through the pipes normally, one of the a/c's doesn't seem to drain anywhere (not through the pipes, not at the compressor outside and it doesn't of course have a seperate drain pipe , none of them do, they use the pre-built ones).
There is no moisture on the walls so WHERE does the condensation drain on the 4th ac?