79
Check of outdoor thermistors
J
When OPERATION INDICATOR lamp flashes 6-time.
The thermistors in the outdoor unit are abnormal.
Check of indoor electronic control P.C. board
I
The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
Indoor electronic
control P.C. board
Varistor (NR11)
Indoor electronic
control P.C. board
Fuse (F11)
1
3
N
2
3
Thermal fuse connector
Terminal
block
Measure
resistance
between CN
641
1
and
2
.
Measure
resistance
between CN
642
1
and
2
.
No
Yes
Replace the
thermistor.
Replace the outdoor
electronic control
P.C. board.
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
the compressor and
transistor module.
Defrost thermistor RT61
Measure
resistance
between CN
641
3
and
4
.
Turn ON the
power supply to
indoor unit and
press the
EMERGENCY
OPERATION
switch.
Discharge
temperature
thermistor RT62
Fin temperature
thermistor RT64
Does the
resistance of the
thermistor have the
characteristics on
page 92?
No
Yes
Does the unit
operate 10 minutes
or more?
Is LED in the
outdoor electronic
control P.C. board
flashing 5 minutes?
Reconnect the
connector
Yes
No
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 .
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 CN151from the indoor electronic
control P.C. board and turn ON the power supply.
No
No
Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
No
Yes
Be sure to check both resistance.
Turn OFF the
power supply.
Turn OFF the
power supply.
Replace the indoor
electronic control
P.C. board.
Measure the
resistance
between
CN201
1
on
the indoor
electronic control
P.C. board and
N
on the terminal
block with the
tester.
Is resistance approx. 0
"
?
Replace the fuse (F12).
No
Yes
(
∞
)
OB245--3qxp 02.10.22 4:15 PM Page 79