33
Outdoor unit does not operate at all, or stops immediately due to overcurrent.
Check of current-limiting resistor
K
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
●
Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.
Turn ON the power
supply and press
EMERGENCY
OPERATION switch.
Replace the inverter P.C.
board or the compressor.
Replace the power P.C.
board or the inverter P.C.
board.
Does the rush current
limiting relay(X64) work
properly? (Normally it
closes 1 second after
outdoor unit power ON.)
No
Yes
No
No
Yes
Yes
Is the resistance of current-limiting
resistor (R64A or R64B) on the
power P.C. board normal?
(Normal resistance : 5
'
i
5%)
Replace the power P.C.board.
Replace the power P.C. board.
Does LED on the inverter
P.C. board light up?
Check of power supply
J
Inverter does not operate.
Disconnect the connector
(CN61) between compressor and
intelligent power module.
Turn ON power supply and press
EMERGENCY OPERATION
switch.
Check the electric
parts in main circuit.
If light up,ok.
If flash, refer to
11-3.
Is there voltage
280V ~ 370V DC
between DB61 (+) and
DB61 (–) on the
inverter P.C. board?
(Refer to 11-6.1.)
Dose LED on the inverter
P.C. board light up or
flash? (Refer to 11-6.1.)
Yes
Yes
Yes
No
No
Replace the indoor
electronic control
P.C. board.
No
Yes
No
Replace the inverter
P.C. board.
DB61
280V~370V DC
Inverter P.C. board
(Solder side)
Is there voltage 230V AC
between the indoor
terminal block S1 and
S2?
Rectify indoor/ outdoor
connecting wire.
Does the upper lamp of
OPERATION INDICATOR
lamp on the indoor unit
light up?
MUZ-GC35VA
MUZ-GC35VAH
OBH469--2.qxp 07.1.22 1:30 PM Page 33
Summary of Contents for MUZ-GC25VA
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