MITSUBISHI ELECTRIC P500YMF-C - Manual (Page 79)

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Phenomena Factors
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 Transformer defects of the BC controller and a malfunction.
5 Defects on the control board of the BC controller
Check method and handling
NO
YES
NO
NO
YES
YES
YES
NO
*1
Check the BC controller
power terminal block
voltage
220 ~ 240V?
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
BC controller
Defects for the
control board
Verify the power
supply wiring original
power supply.
Power supply
reapplying
220 ~ 240V circuit
short and ground
checks
*1 As for transformer checks, It is subject to the failure judgment method of main parts in 4.5.