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13.1 What is self diagnosis function?
When the problem detected in the air conditioner, the operation stops and LED indicator lamps
on the indoor unit will display the error code (Fig. 42).
Kindly refer Table 6a,b for the meanings of error code and indications for each models.
Installation Service
13. SELF DIAGNOSIS FUNCTION
Fig. 42
Table 6a
Error Code
(Indoor)
Diagnostics Item
Diagnostics contents
Models
F1
Indoor room
temperature sensor.
F2
Indoor heat exchanger
coil sensor.
• Sensor opens circuit or short circuit.
• Contact failure at connector.
• Indoor P.C.B failure.
C5
OTP data
(Jumper Cap).
• Jumper Cap on P.C.B failure.
• Indoor P.C.B failure.
K12AP,
K18AP,
K25AP,
K30AP.
H6
Indoor fan motor lock
current.
• Indoor fan motor failure.
If motor running speed is too slow /
stop for 1 min., in order to prevent
motor self-protection activated, it will
stop running and display lock.
• Contact failure at connector.
K12AP,
K18AP,
K25AP.
E5
Overload current
protection.
• Indoor P.C.B overload current
protector activated.
K18AP,
K25AP.
F3
Outdoor temperature
sensor.
• Outdoor dummy Sensor (R1) failure.
• Indoor / outdoor P.C.B failure.
K30AP
only
F4
Outdoor heat
exchanger sensor
.
• Outdoor dummy Sensor (R 2) failure.
• Indoor / outdoor P.C.B failure.
K30AP
only
Table 6b. – ONLY for KC30AP.
Error Code
(Indoor)
Diagnostics Item
LED
(Outdoor)
Diagnostics Contents
E1
High pressure
protection.
Outdoor P.C.B
LED 1 blinking.
• High-pressure switch sensor
activated / failure.
E5
Overload current
protection.
Outdoor P.C.B
LED 2 blinking.
• Outdoor P.C.B overload current
protector activated.
E6
Communication signal
between indoor &
outdoor unit failure.
Outdoor P.C.B
LED 1, 2, 3
blinking.
• Indoor / Outdoor P.C.B failure.
• Wrong wirings connection.
• Wirings contact failure.
-
Communications signal
between Indoor &
outdoor unit normal.
Outdoor P.C.B
LED 4, 5 blink
alternately.
• It shows that the communication
signal is correctly under this
condition.
K9AP,
K9AP,