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3. Indoor unit failure mode table
NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (9-4.).
Left lamp of
OPERATION
INDICATOR lamp
Right lamp of
OPERATION
INDICATOR lamp
Abnormal point
(Failure mode)
Condition Remedy
Not lit Not lit Normal — —
1-time blink
every 0.5-second
Not lit
Room temperature ther-
mistor
When the room temperature thermistor
short or open circuit is detected every
8 seconds during operation.
Refer to the characteristics of the room
temperature thermistor (9-7.).
2-time blink
2.5-second OFF
Not lit
Indoor coil thermistor
(Main 1, 2 and sub)
[Main 2: MLZ-KP18NA]
When the indoor coil thermistor short
or open circuit is detected every 8
seconds during operation.
Refer to the characteristic of the main
1,2 indoor coil thermistor and the sub
indoor coil thermistor (9-7.).
3-time blink
2.5-second OFF
Not lit Serial signal error
When the serial signal from the out-
door unit is not received for a maxi-
mum of 6 minutes.
Refer to 9-6.
"How to check miswir-
ing and serial signal error".
5-time blink
2.5-second OFF
Not lit
Drain pump
Float sensor
• Float sensor is open.
• Float sensor detects abnormal water
level.
• Check the oat sensor and the drain
pump.
• Check the connectors of oat sensor
and the drain pump.
• Refer to 9-6.
"Check of oat sen-
sor".
11-time blink
2.5-second OFF
Not lit Indoor fan motor
When the rotational frequency feed-
back signal is not emitted during 12
seconds the indoor fan operation.
Refer to 9-6.
"Check of indoor fan
motor".
12-time blink
2.5-second OFF
Not lit Indoor control system
When it cannot properly read data in
the nonvolatile memory of the indoor
electronic control P.C. board.
Replace the indoor electronic control
P.C. board.
13-time blink
2.5-second OFF
Not lit
Indoor coil thermistor
(Main 3)
[MLZ-KP18NA]
When the indoor coil thermistor short
or open circuit is detected every 8
seconds during operation.
Refer to the characteristic of the main
3 indoor coil thermistor (9-7.).
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