Drain System Abnormality - Daikin 3MKS50E3V1B Service Manual

Troubleshooting for SA Indoor Unit - FCQG, FFQ, FHQ, FDBQ, FBQ Series
6.5

Drain System Abnormality

AF
Remote
Controller
Display
Method of Water leakage is detected based on the float switch ON/OFF changeover while the compressor
is not operating.
Malfunction
Detection
Malfunction
When the float switch changes from ON to OFF while the compressor is OFF
Decision
Conditions
Supposed
Causes
Troubleshooting
290
Error in the drain pipe installation
Defective float switch
Defective indoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Are
the float switch and
the drain pipe
normal?
YES
Is the
water drain system
normal?
YES
∗ In FHQ, problems can also occur in
the optional drain pump.
Is a drain-up kit installed?
YES
Is the drain pump
normal?
YES
Is
the amount of
circulated drain water
excessive after the pump
stops operation?
NO
Does the
drain water flow in
reverse while the indoor unit
is not operating?
NO
NO
NO
NO
NO
YES
YES
SiBE121135
The float switch may be
defective. Check if the
drain-up height and the
horizontal pipe length
exceed the specifications.
Clogged water drain
system, clogged drain
pump, or faulty float switch
Replace the indoor unit
PCB. Check if the drain-up
height and the horizontal
pipe length exceed the
specifications.
(R16022)
Check the jumper
connector.
Check the drain pump and
the drain pipe.
Check the water drain
system.
Check to see if the drain-up
height and the horizontal
pipe length exceed the
specifications.
Faulty trap in the water
drain system
Replace the indoor unit
PCB.
(R13752)
Service Diagnosis