Table 11-8-1
(3) Check procedures
(For 18K)
No.
1
2
3
4
5
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 3)
in the right next column.
Push [ ] button once to start the
unit. (Do not set the mode to
Fan Only or 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 (compressor) operates
continuously in the above
condition.)
Check points
Check whether or not the fuse (F01)
or (F02) is blown.
Check power supply voltage :
1. Between No.
4
of RY01 and CN31
(AC 220–240V)
2. Between
and of C03
3.
(DC 310–340V)
Between of C
117
and output
side of IC15 (DC 15V)
4. Between 12V and GND
5. Between 5V and GND
Check power supply voltage :
1. Between CN2
8
and
CN31
(DC 15–60V)
Check whether or not all indicators
(OPERATION, TIMER
, ECO, Wi-Fi,
Hi-POWER
)
are indicated 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.
Causes
Impulse voltage was applied or the
indoor fan motor short-circuited.
1.
The terminal block or the crossover
cable is connected wrongly.
2.
The capacitor (C01), line filter (L01),
resistor (R
03
), or the diode (DB01)
is defective.
3.
IC11, R
105, R117
and T
-
01 are
defective.
4.
IC11, IC14, C1
12
and T
-
01 are
defective.
IC51 and IC52 are defective.
The indicators are defective or the
housing assembly (CN10) is defective.
1. The temperature of the indoor heat
exchanger is extremely low.
2. The connection of the heat ex-
changer sensor is loose.
(The connector is disconnected.)
(CN62)
3. The heat exchanger sensor and the
P.C. board are defective.
(Refer to Table 11-8-1.)
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 (DC 15V) between 3
and 4 of the motor terminals.
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.
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.)
6
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.
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION indicator flashes.
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
FILE NO. SVM-19040
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