Service manual

ESIE05-03 Error Codes: Indoor Units
Part 3 – Troubleshooting 3–45
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2.4 Malfunctioning Drain System (AF)
Error code AF
LED indications The table below shows the LED indications.
Error generation The error is generated when the float switch changes from ON to OFF while the compressor is OFF.
Causes The possible causes are:
P Error in the drain pipe installation
P Malfunctioning float switch
P Malfunctioning indoor unit PCB.
Troubleshooting
Operation HAP (green) HBP (green)
Normal
cc
Malfunctioning
cc
Are float
switch and drain
pipe normal?
Is water
drainage system
normal?
Is drain-up
kit installed?
Is drain pump
normal?
Does drain
water flow in
reverse during non
operation?
Is
amount
of circulated drain
water excessive after
pump stops
operation?
Clogged drain water discharge
system
Clogged drain pump
Faulty float switch
Replace indoor unit PCB.
Check to see if drain-up height
and horizontal pipe length
exceed specifications.
Check jumper connector X15A.
Check drain pump and drain
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.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
∗ In FHQ and FAQ problems can also
occur in the optional drain-up kit.
Possible failure of float switch.
Check to see if drain-up height
and horizontal pipe length
exceed specifications.
NO
ESIE05-03.book Page 45 Wednesday, April 6, 2005 4:09 PM