Si18-525B Troubleshooting for SkyAir Indoor Unit
Troubleshooting 343
5.3 Malfunction of Drain System
Remote
Controller
Display
AF
Applicable
Models
FHQ-BU
Method of
Malfunction
Detection
Water leakage is detected based on float switch ON/OFF operation while the compressor is in
non-operation.
Malfunction
Decision
Conditions
When the float switch changes from ON to OFF while the compressor is in non-operation.
Supposed
Causes
Error in drain pipe installation
Faulty float switch
Faulty indoor unit PCB
Troubleshooting
Are float
switch and drain pipe
normal?
Is water
drainage system
normal?
Possible failure of float switch.
Check to see if drain-up height
and horizontal pipe length
exceed specifications.
Clogged drain water discharge
system
Clogged drain pump
Faulty float switch
Replace indoor unit PCB.
Check jumper connector
X15A.
Check drain pump and drain
pipe.
Check water drainage system.
Check to see if drain-up height
and horizontal pipe length
exceed specifications.
Faulty trap in water drainage
system
Replace indoor unit PCB.
Is drain-up
kit installed?
Is drain pump
normal?
Is
amount
of circulated drain
water excessive after
pump stops
operation?
Does
drain water
flow in reverse during
nonoperation?
∗In FHQ-B problems can also occur in
the optional drain-up kit.
(S2733)
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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