MITSUBISHI ELECTRIC Mitsubishi Split-Type - Manual (Page 13)

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2. Indoor unit failure mode table
NOTE:Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).
12-time flash
2.5-second OFF Replace the indoor electronic control
P.C. board.
Indoor control system
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
11-time flash
2.5-second OFF Refer to 9-6. A "Check of indoor fan
motor".
Indoor fan motor
When the rotational frequency feedback
signal is not emitted during 12-second the
indoor fan operation.
2-time flash
2.5-second OFF
Refer to the characteristic of the main
indoor coil thermistor, the sub indoor coil
thermistor (9-7.).
Indoor coil thermistor
When the indoor coil thermistor short or
open circuit is detected every 8 seconds
during operation.
3-time flash
2.5-second OFF Refer to 9-6. D "How to check miswiring
and serial signal error".
Serial signal error
When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.
1-time flash
every 0.5-second Refer to the characteristics of the room
temperature thermistor (9-7.). Room temperature
thermistor
When the room temperature thermistor
short or open circuit is detected every 8
seconds during operation.
Not lighted – Normal –
Left lamp of
OPERATION
INDICATOR lamp
Check point
Abnormal point
(Failure mode)
Detection method
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