SiSG121917E
Troubleshooting for MSP Duct Type Indoor Unit
Part 6 Service Diagnosis
132
6.5 Drain System Abnormality
Error Code
AF
Method of Error
Detection
Water leakage is detected based on the float switch ON/OFF changeover while the compressor
is not operating.
Error Decision
Conditions
The float switch changes from ON to OFF while the compressor is OFF
Supposed
Causes
Error in the drain pipe installation
Defective float switch
Defective indoor unit PCB
Troubleshooting
YES
YES
N
O
N
O
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
The float s
w
itch may
b
e
defecti
v
e. Check if the
drain-
u
p height and the
horizontal pipe length
exceed the specifications.
Clogged
w
ater drain
system, clogged drain
p
u
mp, or fa
u
lty float s
w
itch
Replace the indoor
u
nit
PCB (control PCB). Check
if the drain-
u
p height and
the horizontal pipe length
exceed the specifications.
(R24692)
Are
the float s
w
itch and
the drain pipe
normal?
Is the
w
ater drain system
normal?
