Mitsubishi Electric MUZ-A09YV-E1 Service Manual page 29

Mitsubishi Electric ilmalämpöpumput korjaa ja huoltaa pääkaupunkiseudulla: Jäähdytinpalvelu RefGroup Oy
Outdoor fan motor does not operate.
Check of outdoor fan motor
I
Check the resistance of fan motor. (Refer to page 25.)
Disconnect the connector CN771 on the power P.C.
board.
Disconnect the connector (CN61) between
compressor and power transistor module.
Turn ON the power supply and press the
EMERGENCY OPERATION switch.
Outdoor terminal block
3
Indoor/ outdoor
N
connecting
wire
2
Power P.C. board
Inverter does not operate.
Check of power supply
J
Disconnect the connector
(CN61) between compressor and
power transistor module.
Turn ON power supply and press
the EMERGENCY OPERATION
switch.
3 minutes after power
ON, is there voltage of
230V AC between
outdoor terminal block 2
and N?
Yes
Is there voltage
280V ~ 370V DC
between LD61A (+)
and LD66A (–) on the
inverter P.C. board?
(Refer to page 32.)
No
Check the electric
parts in main circuit.
Is the resistance of fan
motor normal?
Yes
3 minutes after
power ON, is there voltage
230V AC between outdoor
terminal block 2 and N?
Yes
Fan
motor
1 2 3
CN771
Rectify indoor/ outdoor
connecting wire.
Yes
Is there voltage 230V AC
No
between indoor terminal
block 2 and N?
Dose LED on the inverter
Yes
P.C. board light up or
flash? (Refer to page 32.)
Yes
Ok.
If flash, refer to
page 24.
www.ilmalämpöpumput.com
No
Replace the outdoor
fan motor.
Rectify indoor/ outdoor
connecting wire.
Yes
Is there voltage 230V
No
AC between indoor
terminal block 2 and
N?
Is there voltage 230V
AC between CN771 2
and 3 on the power
P.C. board?
Yes
Replace the
outdoor fan motor.
Indoor/ outdoor
connecting
wire
Replace the indoor
No
electronic control
P.C. board.
No
Replace the inverter
P.C. board.
(–)
LD66A
LD61A (+)
Inverter P.C. board
(Pattern side)
29
Replace the indoor
No
electronic control
P.C. board.
No
Replace the
power P.C. board.
Outdoor terminal block
3
N
2
280V~370V DC