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Phenomena
(2)LED2 on indoor controller board
is blinking.
(3)Upward/downward vane
performance failure
(4)Receiver for wireless remote
controller
9-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICROPROCESSOR FAILS
1. When the wired remote control or the indoor unit microprocessor has failed, but all other components work properly,
if you set the switch (SWE) on the indoor controller board ON, the indoor unit will begin emergency operation.
When emergency operation is activated, the indoor unit operates as follows:
• Indoor fan is running at high speed.
2. When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) on the indoor controller
board and activate emergency operation of the outdoor unit.
For details on how to activate emergency operation of the outdoor unit, refer to the outdoor unit wiring diagram.
3. Before you activate emergency operation, check the following points:
(1) Emergency operation cannot be activated when:
• the outdoor unit malfunctions. • the indoor fan malfunctions.
• it has detected the malfunction of drain pump during self-diagnosing. (Check code: P5)
(2) Emergency operation becomes continuous only by switching the power source on/off.
ON/OFF on the remote control or temperature control, etc. does not function.
(3) Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation of the heating is acti-
vated because it will start to blow cold air.
(4) Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5) After emergency operation has been deactivated set the switches, etc. to their original positions.
(6) Movement of the vanes does not work in emergency operation, therefore you have to slowly set them manually to the
appropriate position.
OCH492A
Note: Refer to the outdoor unit's service manual 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 Mis-wiring 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-cut 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
• Up/down vane setting is "No vanes".
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 con-
troller board. (Insert failure)
4 Contact failure of connector between wireless remote
controller board and indoor controller board.
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
address is 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-
cut 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 "How
to check the parts".)
• Check for breaking of wire or connec-
tion failure of connector.
• Check "Up/down vane setting". (Unit
function selection by remote controller).
3 Normal operation (Each connector on
vane motor side is disconnected.)
1 Replace batteries of wireless remote con-
troller.
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.
22
Countermeasure
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