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Troubleshooting
1.2.2 Troubleshooting by Alarm Code
Alarm
Code
01
Activation of Protection Device (Float Switch) in Indoor Unit
● The RUN indicator (Red) is ashing
● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★
This alarm code is indicated when the contact between #1 and #2 of CN14 is opened for over 120 seconds during the
cooling, dry, fan or heating operation.
I.U. PCB: Indoor Unit PCB
Is DC12V applied between #2 of CN14
and GND?
Activation of Float Switch (FS)
or Incorrect Wiring
Faulty I.U. PCB
Yes
No
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Activation of
Float Switch
Check conduction when
drain level is low.
Check drain pan.
Check drainage by
pouring water.
High Drain
Level
Faulty
Float Switch
Clogging of
Drainage
Up-Slope
Drain Piping
Remove foreign particles
clogging the drainage.
Replace float switch
if faulty.
Fault
Measure resistance
by tester.
Repair looseness and
replace connector.
Faulty
Contacting
Check connections. Repair connection.
Faulty
Connection
Check PCB by
self-checking .
Replace it if faulty.Faulty Indoor Unit PCB
Indication of Outdoor Unit PCB
Alarm Code
Indoor Unit No.
for Malfunction
THM1 THM2 THM3 THM4 THM5 CN1925
CN3 CN4 CN14
GND
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