Troubleshooting By Inferior Phenomena - Mitsubishi Electric PCA-RP71HA Service Manual

10-3. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena
(1)LED2 on indoor controller board
is off.
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 220~240V is not supplied to indoor
unit.
4 Defective indoor power board.
5 Defective indoor controller board.
(For the separate indoor/outdoor unit power sup-
ply 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.
4 Defective indoor power 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 AC 220~240V 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 cir-
cuit 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 mis-wiring.
• When AC 220~240V is detected.
—Check 4 (below).
4 Check voltage output from CN2S on indoor
power board (DC13.1V). Refer to 10-6-1.
• When no voltage is output.
Check the wiring connection.
• When output voltage is between DC12.5V
and DC13.7V.
—Check 5 (below).
5 Check the wiring connection between indoor
controller board and indoor power board.
Check the fuse on indoor controller board.
If no problems 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 meth-
od of connecting the connectors.
• When there are problems in the method
Connect the connector correctly referring
• When there is no problem in the method
-Check 3 (below).
3 Check voltage output from CNDK on indoor
controller board.
• When AC220~240V is not detected.
Check the fuse on indoor controller board.
Check the wiring connection between
• When AC220~240V is detected.
-Check 4 (below).
4 Check voltage output from CN2S on indoor
power board.
• When no voltage output.
Check the wiring connection between
CNDK on indoor controller board and
CNSK on indoor power board.
If no problem are found,indoor power
• When DC12.5~13.7V is detected.
Check the wiring connection between
CN2D on indoor power board.
If no problem are found,indoor controller
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.
20
Countermeasure
of connecting the connectors.
to installation manual of an optional kit.
of connecting the connectors.
indoor power supply terminal block and
CND on indoor controller board.
board is defective.
CN2S on indoor power board and
board is defective.