Service manual

– 70 –
Turn off power
supply once, and
turn it on again.
Start to operate
indoor unit in cooling
operation at airflow
level “LOW”.
Turn off indoor unit and
remove connector from motor.
Then start to operate indoor
unit with remote controller.
Turn off indoor unit and remove
connector from motor.
Then push START/STOP button
on remote controller to stop
flashing lamp on indoor unit.
Change airflow level
to “HIGH”.
Turn off indoor unit
and rotate cross-flow
fan by hand when the
unit is on standby.
At this time, is it possible to
detect DC 1V or more
between
5
+
and 3 –
of motor connector
(CN10).
Start to operate the
indoor unit in except
heating operation.
At this time, is it possible
to detect DC 1V or more
between
5
+
and 3 –
of motor connector (CN10)?
(Check this condition
within 15 seconds after
starting unit.)
Start to operate the
indoor unit in except
heating operation.
At this time, is it possible to
detect DC 1V or more between
5
+
and 3 – of motor
connector (CN10)?
Is it possible to detect
DC 1V or more between
5
+
and 3 – of
motor connector (CN10).
Is it possible to detect
DC 310–340V between
1
+
and 3 – of motor
connector (CN10).
(Motor connection condition)
Is it possible to detect DC 15V
between 4
+
and 3 – of
motor connector (CN10).
Is it possible to detect
DC 15V between
4
+
and 3 – of motor
connector (CN10).
Is it possible to
change airflow level
to “HIGH”?
Is it possible to
rotate cross-flow fan by
hand properly?
Does fan motor
continue to operate?
Does indoor
fan operate?
Fan motor
operates normally.
Replace indoor
fan motor.
Replace main
P.C. board.
Replace
bearing.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
(3) Only the indoor motor fan does not operate
<Primary check>
1. Is it possible to detect the power supply voltage (AC220–240V) between

and

on the terminal block?
2. Does the indoor fan motor operate in cooling operation?
(In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned
on, to prevent a cold air from blowing in.)