Mitsubishi Electric MUZ-GC25VA, Руководство по обслуживанию

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38
Check of defrost heater
P
Replace the inverter P.C. board.
Is there 230V AC between CN722
1
and
3
on the
inverter P.C. board(GC25) or power P.C.
board(GC35)? Refer to 11-6.
Yes
No
No problem of the inverter P.C.
board(GC25) or power P.C.
board(GC35).
Is the voltage between CN726
2
(+)-
3
(-)
on the power P.C. board 0V DC? Refer
to 11-6.
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 below, and let
the defrost thermistor continue to read -1 : or below.
3
2
1
230V AC
(MUZ-GC25VAH)
(MUZ-GC35VAH)
1
230V AC
MUZ-GC25VAH
Inverter P.C board
MUZ-GC35VAH
Power P.C board
3 2
Check the following points before checking electric continuity.
1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1.
2) Is the resistance of defrost heater normal? Refer to 11-4.
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
26H
CN722
H
1 2 1 2
Outdoor base gets frozen.
MUZ-GC25VAH MUZ-GC35VAH
OBH469--2.qxp 07.1.22 1:30 PM Page 38