45
Check of defrost heater
M
Replace the inverter P.C. board.
Is there 230V AC between CN722
1
and
3
on the
power P.C. board? Refer to 11-7.2.
Yes
No
No problem of the
power P.C. board.
Is the voltage between CN726
2
(+)-
3
(-)
on the
power P.C. board 0V DC? Refer to 11-7.2.
Yes
No
Replace the power
P.C. board.
NOTE: In case both thermistors are more than the above
temperature, cool them with cold water etc...
In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5
:
or less, and let the
defrost thermistor continue to read -1
:
or less.
3
2
1
230V AC
Check the following points before checking electric continuity.
1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-7.1.
2) Is the resistance of defrost heater normal? Refer to 11-5.
3) Does the heater protector remain conducted (not open)?
4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?
26H
CN726
CN722
H
2
1
2
1
2
3
Outdoor base gets frozen.
<MUZ-GA25VAH MUZ-GA35VAH>
Check of inverter P.C. board
N
Outdoor fan motor does not operate, or stops immediately after starting up.
Replace the inverter P.C. board.
CN931
CN932
Inverter P.C.board
(Solder side)
Check the outdoor fan motor.
Refer to11-6.
I
.
Yes
(10-time flash)
Check the LED indication on
the inverter P.C. board.
Does the LED flash 10-time?
No
Check the corresponding parts
following LED indication.
(Refer to 11-4.)
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the connection of the connectors.
(CN931, CN932) of outdoor fan motor.
If the connection is poor, make it correct.
MUZ-GA35VA
MUZ-GA35VAH
OB379C--2qxp 07.2.1 2:28 PM Page 45
