Troubleshooting Of Problems - Mitsubishi Electric PEY Series Service Manual

TROUBLESHOOTING

9-4. Troubleshooting of problems

Phenomena
(1) LED2 on indoor controller board is
off.
HWE1305A
Note: Refer to the manual of outdoor unit for the detail of remote controller.
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".)
35
Countermeasure
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.