My Mitsu Mini Split was installed with a clear plastic hose for the drain. The drain stopped up because this got crimped. The water backed up into my room and this happened twice before the installer recognized that it required a rigid pvc pipe.
What does Mitsu require to be used for condensate return? I read the instal manual and it talks of 'drain hose'. Should the installer have used PVC pipe to begin. Also is there a regular maintenance schedule for this unit like other heat pumps. And why is it that after nearly 9 months of use the filters inside the unit are clear and have no dust accumulation that I can see. This is not a dust free room. Otherwise great unit!