Table of Contents
Advertisement
Outdoor base gets frozen.
Check of defrost heater
M
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?
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.
Is there 230V AC between CN722 1 and 3 on the
power P.C. board? Refer to 11-7.2.
Is the voltage between CN726 2(+)-3(-) on the
power P.C. board 0V DC? Refer to 11-7.2.
Replace the inverter P.C. board.
Outdoor fan motor does not operate, or stops immediately after starting up.
Check of inverter P.C. board
N
MUZ-GA35VA
MUZ-GA35VAH
Check the outdoor fan motor.
Refer to11-6.I.
Check the connection of the connectors
(CN931, CN932) of outdoor fan motor.
If the connection is poor, make it correct.
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the LED indication on
the inverter P.C. board.
Does the LED flash 10-time?
Yes
(10-time flash)
Replace the inverter P.C. board.
<MUZ-GA25VAH MUZ-GA35VAH>
NOTE: In case both thermistors are more than the above
temperature, cool them with cold water etc...
No
No
Inverter P.C.board
(Solder side)
CN931
CN932
Check the corresponding parts
No
following LED indication.
(Refer to 11-4.)
Yes
No problem of the
power P.C. board.
Yes
Replace the power
P.C. board.
45
2
3
230V AC
CN726
3
2
1
CN722
26H
H
Advertisement
Table of Contents
