50
Check of outdoor thermistors
I
Check of indoor electronic P.C. board
H
Measure
resistance
between. CN
641
1
and
2
Measure
resistance
between. CN
642
1
and
2
No
No
Yes
Yes
The unit does not operate with the remote controller. The operation indicator lamp does not light up either, with the
Emergency operation switch ON.
The thermistors in the outdoor unit are abnormal.
Thermistor is
defective.
Disconnecting connector
or inferior connecting
indoor electronic
control P.C. board
varistor (NR11)
Indoor electronic
control P.C. board
fuse (F11)
1
3
N
2
3
thermal fuse connector
●
Disconnect the connectors CN 641 and CN 642 from the outdoor electronic control P.C. board.
(Check the characteristics of each thermistor.)
1
Connect CN 641 and
CN 642.
2
Disconnect the
connector between
compressor and IPM.
(Defrost thermistor)
Measure
resistance
between. CN
641
3
and
4
Turn on power to
indoor unit and
press Emergency
operation switch
Discharge
temperature
thermistor
(
)
Fin
temperature
thermistor
(
)
As per the
characteristics
on page 55?
As per the
characteristics
on page 55?
Does the unit operate
10 minutes or more?
No
Yes
Thermal
block
Is LED in the electronic
control P.C. board
flashing 5 minutes?
Inferior electronic control
P.C. board
No
Yes
Check both “parts side”
and “pattern side” of indoor
electronic control P.C.
board visually.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan motor .
Trouble of the
indoor electronic
control P.C. board.
Is winding resistance
of fan motor 0
"
?
Is winding resistance
of vane motor 0
"
?
No
Yes
Replace the vane motor. .
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and vane motor connector CN151
from the ELECTRONIC CONTROL P.C. board and turn on the power supply.
No
No
The unit doesn’t operate with the remote controller.
Also, the Power monitor lamp doesn’t light up
by pressing the EMERGENCY OPERATION switch.
No
Yes
Be sure to check both resistance.