Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 40

( 4 ) Backflow stopper and drain catch basin
[1] Remove the control box cover. → See (2) [1].
[2] Check that LED4 on the control circuit board is OFF,
and then remove the maintenance covers. → See (2) [3] and [4].
[3] Remove the filters and inner cover. → See (2) [5].
Precaution
Before proceeding to the next step [4], wipe off the
remaining water on the drain pan with a cloth or the
like to avoid water spills from the drain pan.
[4] Remove the screws (two special screws 4×9, indicated
by ), and remove the drain catch basin.
Precaution
Be careful not to spill the remaining water from the
drain catch basin or connected drain pipe.
[5] Remove the screws (two special screws 4×9, indicated
by ), and remove the stopper holder.
[6] Remove the backflow stoppers.
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Cloth
Drain catch basin
Stopper holder
Backflow stopper