Table 11-8-1
(3) Check procedures
No.
1
2
3
4
5
6
7
Procedure
Turn off the power supply breaker
and remove the P.C. board
assembly from electronic parts
base. Remove the connecting
cables from the terminal block.
Remove the connector of the
motor and turn on the power
supply breaker. If OPERATION
indicator flashes (once per
second), it is not necessary to
check steps (1 to
4
) in the right
next column.
Push [ ] button once
to start the unit. (Do not set the
mode to On-Timer operation.)
Shorten the restart delay timer
and start unit.
Push [ ] button once to start
the unit.
• Shorten the restart delay timer.
• Set the operation mode to
COOL.
• Set the fan speed level to
AUTO.
• Set the preset temperature
much lower than the room
temperature. (The unit (com-
pressor) operates continuously
in the above condition.)
If the above condition (No. 5) still
continues, start the unit in the
following condition.
• Set the operation mode to
HEAT.
• Set the preset temperature
much higher than room tem-
perature.
Connect the motor connector to
the motor and turn on the power
supply.
Start the unit the following
condition.
• Set the fan speed level to HIGH.
(The unit (compressor) operates
continuously in the above
condition in No. 5.)
Check points
Check whether or not the fuse (F01)
is blown.
Check power supply voltage :
1. Between
Pin 4 of
CN30
and CN
3
1
(AC 220–240V)
2. Between
and of C
03
(DC 310–340V)
3. Between 15V and GND
4.
Between 12V and GND
5.
Between 5V and GND
Check power supply voltage :
1. Between CN
2
8
and
CN
3
1
(DC 15–60V)
Check whether or not all indicators
(OPERATION,TIMER
, HI-POWER,
ECO, W
ireless adapter
) are lit for 3
seconds and
they return to normal 3
seconds later.
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION indicator flashes.
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION indicator flashes.
Causes
Impulse voltage was applied or the
indoor fan motor short-circuited.
1.
2.
The terminal block or the crossover
cable is connected wrongly.
The
fuse
(
F
01), line filter
(L01), resistor (R
03
), or the diode
(DB01) is defective.
3.
IC11, IC15, Q102, C117 and
T01
are
defective.
4.
IC11, C109
and
T01 are defective.
5.
IC11,
IC
14
and T01 are defective.
IC5
2
and IC5
3
are defective.
The indicators are defective or the
housing assembly (CN
1
0
) is defective.
1. The temperature of the indoor heat
exchanger is extremely low.
2. The connection of the heat
exchanger sensor is loose.
(The connector is disconnected.)
(CN62)
3. The heat exchanger sensor and the
P.C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective.
1. The temperature of the indoor heat
exchanger is extremely high.
2. The connection of the heat
exchanger sensor short-circuited.
(CN62)
3. The heat exchanger sensor and the
P.C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective
1. The indoor fan motor is defective.
(Protected operation of P.C. board.)
2. The P.C. board is defective.
3. The connection of the motor
connector is loose.
1. Check it is impossible to detect
the voltage (AC120V or higher
voltage) between red and black
lead of the motor.
2. The motor does not operate or
the fan motor does not rotate with
high speed.
(But it is possible to receive the
signal from the remote controller.)
3. The motor rotates but vibrates
strongly.
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