Mitsubishi Electric Mr.SLIM PCFY Series Service Manual page 28

10-4. TROUBLESHOOTING OF PROBLEMS
Phenomena
(1) LED2 on indoor controller board
is off.
OCH416D
Cause
• When LED1 on indoor controller board is also off.
1 Power supply of rated voltage is not supplied to
outdoor unit.
2 Defective outdoor controller circuit board
3 Power supply of 220~240V is not supplied to indoor
unit.
4 Defective indoor controller board
(For the separate indoor/outdoor unit power
supply system)
1 Power supply of 220~240V AC is not supplied to
indoor unit.
2 The connectors of the optional replacement kit are
not used.
3 Defective indoor controller board
• When LED1 on indoor controller board is lit.
1 Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant address
"0".)
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
1 Check the voltage of outdoor power
supply terminal block(L,N) or (L3,N).
• When AC220~240V is not detected, check
the power wiring to outdoor unit and the
breaker.
• When AC 220~240V is detected, check
2 (below).
2 Check the voltage between outdoor
terminal block S1 and S2.
• When AC 220~240V is not detected,
check the fuse on outdoor controller
circuit board, check the wiring
connection.
• When AC 220~240V is detected, check
3 (below).
3 Check the voltage between indoor
terminal block S1 and S2.
• When AC 220~240V is not detected,
check indoor/outdoor unit connecting
wire for miswiring.
• When AC 220~240V is detected, check
4 (below).
4 Check the fuse on indoor controller
board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.
1 Check the voltage of indoor power supply
terminal block (L,N).
• When AC220~240V is not detected,
Check the power supply wiring.
• When AC220~240V is detected, check
2 (below).
2 Check that there is no problem in the
method of connecting the connectors.
• When there are problems in the method
of connecting the connectors.
Connect the connector correctly referring
to installation manual of an optional kit.
• When there is no problem in the method
of connecting the connectors, check 3
(below).
3 Check the fuse on indoor controller
board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.
1 Check again the setting of refrigerant
address for outdoor unit.
Set the refrigerant address to "0".
(For grouping control system under which
2 or more outdoor units are connected,
set one of the units to "0".)
Set refrigerant address using SW1 (3-6)
on outdoor controller circuit board.
28
Countermeasure