–82–
Symptom Cause
3 When the remote
control SW is turned
on, the indication
goes off after
approximately 20- 30
seconds, and indoor
unit stops.
1) Power supply from the transformer is not available to the control board of BC controller.
1 The original power supply of the BC controller is not turned on.
2 Removal of connectors (CN12, CN38, CNTR) on the control board of the BC controller.
3 Fuse on the control board of the BC controller is blown.
4 Defective transformer of the BC controller.
5 Defects on the control board of the BC controller.
Check method and Remedy
NO
YES
NO
NO
YES
YES
YES
NO
*1
Check the BC controller
power terminal block
voltage
Is the
voltage between 220
and 240 V?
Fuse blown off
Removed?
Within spec.?
Fuse check on the
board
Connector removal
checks
(CN03, CN12, CNTR)
Connector connection
defects
Modify the defective
places
Check for factors of
transformer cut
Earth route on the board
Earth route of sensor
and LEV
Check for resistance
value of transformer
Defects in BC
controller for the
control board
Verify the power
supply wiring.
Power supply
reapply
220 ~ 240V circuit
short and ground
checks
*1 For transformer checks, It is subject to the failure judgment method of main parts in 4.5.
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