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-58-

Check the SSR high speed operation by remote control.

(the Indoor Fan Motor is connected)

Turn off main power.

Check the connection of CN-FAN.

Check the Fan Motor.

Check the Fuse(AC250V, T2A).

Turn on the main power

Check the related circuit of indoor Fan Motor.

• The pin No.10 of micom and the part for driving SSR.
• Check the related pattern.
• Check the SSR.

- SSR Open: Indoor Fan Motor never operate.
- SSR short: Indoor Fan Motor always operates in case of ON or OFF.

The voltage of Pin No 1(orange) and 3(black) of CN-FAN.

About AC 180V over

About AC 50V over

SSR is not damaged

Check SSR

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• Confirm that the vertical louver is normally geared with the shaft of Stepping Motor.
• If the regular torque is detected when rotating the vertical louver with hands

⇒

Normal

• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PCB) of CN-U/D Connector

Check the operating circuit of the vertical louver

• Confirm that there is DC +12V between pin 

➀

of CN-U/D and GND.

• Confirm that there is a soldering short at following terminals.

- Between

➀

,

➁

,

➂ 

and 

➃

of MICOM

- Between 

4

,  

5  ,   6   

and  

7

of IC01M  

- Between 

10

, 

11 ,  12 

and 

13

of IC01M

If there are no problems after above checks.

• Confirm the assembly condition that are catching and interfering parts in the link of the

vertical louver

-60-

Does the Operating LED of indoor unit blink
when Operation's ON?

Is the Connection between indoor power
relay Pin 

➂

and terminal block No. 1 right?

Refer to the self-diagnosis function.

YES

Check the connecting state of connector

NO

NO

Is the connection of cable between indoor
and outdoor unit right?

1(Brown)

1(Brown)

2(Blue)

2(Blue)

3(Green/YL)

3(Green/YL)

4(Red)

4(Red)

NO

YES

Is the voltage of CN-POWER 

➀

,

➁

in

outdoor PCB Ass'y about AC220V / 240V
when Operation's ON?

Check the Fuse of Outdoor PCB Ass'y.

NO

YES

Is the voltage of CN-AC 

➀

,

➂

in outdoor

PCB Ass'y about AC220V / 240V?

Check the PTC and RY-PWR.

NO

YES

Is the Bridge Diode(DB01Z) right?

Replace the Bridge Diode.

NO

YES

Replace the PCB Ass'y.

NO

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Does the LED01M of outdoor PCB Ass'y
blink 6 times?

Check the state of connecting cable (3 line)
between indoor and outdoor uint.

■

➅

NO

YES

Is the connecting state of connectors in
outdoor Sub. PCB Ass'y right?
(CN-UVW, CN-IPM)

• Electrical wiring diagram (Colors)
• Check the connecting state of connectors

in PCB Ass'y(Main/Sub)

• If CN-UWV is connected, the comprressor

can be operated a opposite direction.

NO

YES

Is the power module in Sub PCB Ass'y
right?

• Check the short P-N P-U, V, W, and N-U,

V, W of IPM and then collector, emiter of
IGBT

• Replace the Sub PCB Ass'y.

NO

YES

Is the voltage of CN-AC over than
AC170V?

Check the supplied voltage.

NO

YES

Is the voltage of CN-DC over than about
DC380V?

• Check CN-IPM connector(Pin No. 12)
• Replace the Sub PCB Ass'y.

NO

YES

Is the refrigerant pressure right?

Replace the PCB Ass'y.

• Main PCB Ass'y
• Sub PCB Ass'y
• Control Box Ass'y

Supply the refrigerant.

NO

NO