Mitsubishi Electric PEY Series Service Manual page 36

TROUBLESHOOTING
Phenomena
(2) LED2 on indoor controller board is
blinking.
(3) Upward/downward vane
performance failure
(4) Receiver for wireless remote
controller
HWE1305A
Note: Refer to the manual of outdoor unit for the detail of remote controller.
Cause
• When LED1 on indoor controller board is
also blinking.
Connection failure of indoor/outdoor unit
connecting wire
• When LED1 is lit.
1 Miswiring of remote controller wires
Under twin triple indoor unit system, 2 or
more indoor units are wired together.
2 Refrigerant address for outdoor unit is
wrong or not set.
Under grouping control system, there are
some units whose refrigerant address is 0.
3 Short-circuit of remote controller wires
4 Defective remote controller
1 The vane is not downward during
defrosting and heat preparation and when
the thermostat is OFF in HEAT mode.
(Working of COOL protection function)
2 Vane motor does not rotate.
• Defective vane motor
• Breaking of wire or connection failure of
connector
3 Upward/downward vane does not work.
• The vane is set to fixed position.
1 Weak batteries of wireless remote
controller
2 Contact failure of connector (CNB) on
wireless remote controller board
(Insert failure)
3 Contact failure of connector (CN90) on
indoor controller board (Insert failure)
4 Contact failure of connector between
wireless remote controller board and
indoor controller board
36
Countermeasure
Check indoor/outdoor unit connecting wire for
connection failure.
1 Check the connection of remote controller
wires in case of twin triple indoor unit
system. When 2 or more indoor units are
wired in one refrigerant system, connect
remote controller wires to one of those
units.
2 Check the setting of refrigerant address in
case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.
34 Remove remote controller wires and
check LED2 on indoor controller board.
• When LED2 is blinking, check the short-
circuit of remote controller wires.
• When LED2 is lit, connect remote controller
wires again and:
if LED2 is blinking, remote controller is
defective; if LED2 is lit, connection failure of
remote controller terminal block etc. has
returned to normal.
1 Normal operation (The vane is set to
horizontal regardless of remote control.)
2 Check 2 (left).
• Check the vane motor. (Refer to 9-6. How
to check the parts.)
• Check for breaking of wire or connection
failure of connector.
3 Normal operation (Each connector on vane
motor side is disconnected or setting the
fixed vanes by wired remote controller.)
1 Replace batteries of wireless remote
controller.
2~4
Check contact failure of each connector.
If no problems are found of connector,
replace indoor controller board.
When the same trouble occurs even if
indoor controller board is replaced, replace
wireless remote controller board.