– 72 –
(3) Check procedures
Table 11-6-1
No. Procedure Check points Causes
1 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.
Check whether or not the fuse (F01)
is blown.
Impulse voltage was applied or the
indoor fan motor short-circuited.
2 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.
Check power supply voltage :
1. Between No. 1 and No. 3 of CN67
(AC 220–240V)
2. Between and of CN08
(DC 310–340V)
3. Between 12V and GND
4. Between 5V and GND
1. The terminal block or the crossover
cable is connected wrongly.
2. The capacitor (C01) Varistor (R01),
line filter (L01), resistor (R03,R04), or
the diode (DB01) is defective.
3. T01 is defective.
4. IC01,IC02 and T01 are defective.
3
Push [ ] button once to start the
unit. (Do not set the mode to On-
Timer operation.)
Check power supply voltage :
1. Between No.1 and No.3 of CN67
(DC 15–60V)
IC08 and IC09 are defective.
4 Shorten the restart delay timer and
start unit.
Check whether or not all indicators
(OPERATION, TIMER, PRE. DEF, Hi
POWER) are lit for 3 seconds and
they return to normal 3 seconds later.
The indicators are defective or the
housing assembly (CN214) is defective.
5
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.)
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 low.
2. The connection of the heat exchanger
sensor is loose.
(The connector is disconnected.)
(CN101,CN102)
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.
6 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.)
1. Check it is impossible to detect the
voltage (DC15V) between No.4
and No.5 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.
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.
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