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TROUBLESHOOTING
1.2.2 Troubleshooting by Alarm Code
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the contact between #1 and #2 of CN14 is not closed over 120
seconds during the cooling, fan or heating operation.
Is DC12V applied between #2 of CN14
and GND?
Activation of Safety Device
(such as Float Switch FS) or
Incorrect Wiring
Faulty PCB
Yes
No
*1): Refer to 1.3.1 “Self Checking of PCBs using Remote Control Switch”.
Alarm
Code
Activation of Safety Device in Indoor Unit
THM1 THM2 THM3 THM4 THM5 CN19 CN25
THM1 THM2 THM3 THM4 THM5 THM6
CN1 CN3 CN4 HA CN14
RCI, RCD, RPI, Types
Other Types
LED1 LED2
LED4
CN12
CN9
CN10
CN14
CN13
R24
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Activation of
Float Switch
Check continuity when
drain level is low.
Check drain pan.
High Drain
Level
Faulty
Float Switch
Clogging of
Drainage
Up-Slope
Drain Piping
Remove clogged
foreign particles.
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 *1).
Replace it if faulty.Faulty Indoor Unit PCB
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