Mitsubishi Electric PSA-RP71KA Service Manual page 18

9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA
Phenomena
(1) LED2 on indoor controller board
is off.
OCH528B
Cause
• When LED1 on indoor controller board is also off.
1 Power supply of rated voltage is not supplied to out-
door unit.
2 Defective outdoor controller circuit board.
3 Power supply of 220–240 V is not supplied to indoor
unit.
4 Defective indoor controller board.
(For the separate indoor/outdoor unit power sup-
ply system)
1 Power supply of 220–240 V 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 220–240 V AC is not detected.
Check the power wiring to outdoor unit
and the breaker.
• When 220–240 V AC is detected.
—Check 2 (below).
2 Check the voltage between outdoor terminal
block S1 and S2.
• When 220–240 V AC is not detected.
Check the fuse on outdoor controller cir-
cuit board.
Check the wiring connection.
• When 220–240 V AC is detected.
—Check 3 (below).
3 Check the voltage between indoor terminal
block S1 and S2.
• When 220–240 V AC is not detected.
Check indoor/outdoor unit connecting wire
for mis-wiring.
• When 220–240 V AC is detected.
—Check 4 (below).
4 Check the fuse on indoor controller board.
Check the wiring connection.
If no problem is found, indoor controller board
is defective.
1 Check the voltage of indoor power supply
terminal block (L,N).
• When 220–240 V AC is not detected.
Check the power supply wiring.
• When 220–240 V AC is detected.
-Check 2 (below).
2 Check that there is no problem in the meth-
od 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 is found, indoor controller
board is defective.
1 Reconfirm 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.
18
Countermeasure