Malfunction Tree Analysis (FTA) Si30-408
100 Troubleshooting
4.4 Water Leakage from Indoor Unit
Air flow shortage
Faulty fan motor
Refrigerant deflection
Hole opened drain pan
Drain pump failure
Clogged drain pipe
Float SW failure
Splashes from fin
An actual example;
Sealing materials inserted in tube sheet of
cassette or double flow cassette, or between
partition plates of heat exchanger come out
from contacting part with tube sheet and come
into contact with heat exchanger resulting water
leakage.
Water leakage
Waterdrop fall down
from fin
Foreign matter adhesion /
Structural deformation
Water leakage from drain
pan
Adhesion of waterdrop caused by heat exchange
water repellent (misting)
Heat exchanger
water repellent
Contact drain pan
with heat exchanger
Generation of waterdrop
by fin breakage
Dirty air filter, heat
exchanger
Malfunction of
refrigerant system
Refrigerant
shortage
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